GeoMedia SQL Server Spatial User Guide_06.01.00
Comments
Description
GeoMedia SQL Server SpatialUser Guide 6.1.0 May 2012 Copyright Copyright © 2012 Intergraph Corporation. All Rights Reserved. Including software, file formats, and audiovisual displays; may be used pursuant to applicable software license agreement; contains confidential and proprietary information of Intergraph and/or third parties which is protected by copyright law, trade secret law, and international treaty, and may not be provided or otherwise made available without proper authorization from Intergraph Corporation. U.S. Government Restricted Rights Legend Use, duplication, or disclosure by the government is subject to restrictions as set forth below. For civilian agencies: This was developed at private expense and is "restricted computer software" submitted with restricted rights in accordance with subparagraphs (a) through (d) of the Commercial Computer Software - Restricted Rights clause at 52.227-19 of the Federal Acquisition Regulations ("FAR") and its successors, and is unpublished and all rights are reserved under the copyright laws of the United States. For units of the Department of Defense ("DoD"): This is "commercial computer software" as defined at DFARS 252.227-7014 and the rights of the Government are as specified at DFARS 227.7202-3. Unpublished - rights reserved under the copyright laws of the United States. Intergraph Corporation P.O. Box 240000 Huntsville, AL 35813 Terms of Use Use of this software product is subject to the End User License Agreement ("EULA") delivered with this software product unless the licensee has a valid signed license for this software product with Intergraph Corporation. If the licensee has a valid signed license for this software product with Intergraph Corporation, the valid signed license shall take precedence and govern the use of this software product. Subject to the terms contained within the applicable license agreement, Intergraph Corporation gives licensee permission to print a reasonable number of copies of the documentation as defined in the applicable license agreement and delivered with the software product for licensee's internal, non-commercial use. The documentation may not be printed for resale or redistribution. Warranties and Liabilities All warranties given by Intergraph Corporation about equipment or software are set forth in the EULA provided with the software or applicable license for the software product signed by Intergraph Corporation, and nothing stated in, or implied by, this document or its contents shall be considered or deemed a modification or amendment of such warranties. Intergraph believes the information in this publication is accurate as of its publication date. The information and the software discussed in this document are subject to change without notice and are subject to applicable technical product descriptions. Intergraph Corporation is not responsible for any error that may appear in this document. The software discussed in this document is furnished under a license and may be used or copied only in accordance with the terms of this license. No responsibility is assumed by Intergraph for the use or reliability of software on equipment that is not supplied by Intergraph or its affiliated companies. THE USER OF THE SOFTWARE IS EXPECTED TO MAKE THE FINAL EVALUATION AS TO THE USEFULNESS OF THE SOFTWARE IN HIS OWN ENVIRONMENT. Intergraph is not responsible for the accuracy of delivered data including, but not limited to, catalog, reference and symbol data. Users should verify for themselves that the data is accurate and suitable for their project work. Trademarks Intergraph, the Intergraph logo, and GeoMedia are registered trademarks of Intergraph Corporation. Microsoft and Windows are registered trademarks of Microsoft Corporation. Bing is a trademark of Microsoft Corporation. Google Maps is a trademark of Google Incorporated. Pictometry Intelligent Images is a registered trademark of Pictometry International Corporation. Other brands and product names are trademarks of their respective owners. Contents Introduction .................................................................................................................................................. 5 Delivery and Connection ............................................................................................................................ 5 Prerequisites ........................................................................................................................................... 5 Connections ............................................................................................................................................ 5 Password Persistence ............................................................................................................................ 6 Permissions............................................................................................................................................. 6 SQL Server Warehouse Requirements .................................................................................................. 7 Data Storage and Type Matching ............................................................................................................... 9 Geometry Storage ................................................................................................................................... 9 GeoMedia's Binary Geometry to Native Geometry Type Matching ...................................................... 11 SQL Server to GeoMedia Data Type Matching .................................................................................... 14 GeoMedia to SQL Server Data Type Matching .................................................................................... 15 GeoMedia Metadata Requirements .......................................................................................................... 16 Scalar Functions ................................................................................................................................... 17 AttributeProperties Table ...................................................................................................................... 18 FieldLookup Table ................................................................................................................................ 19 GAliasTable........................................................................................................................................... 19 GCoordSystem Table ........................................................................................................................... 20 GeometryProperties Table .................................................................................................................... 21 GFeatures Table ................................................................................................................................... 22 GFieldMapping Table ............................................................................................................................ 23 GIndexColumns Table .......................................................................................................................... 24 GParameters Table ............................................................................................................................... 25 GPickLists Table ................................................................................................................................... 27 GQueue Table....................................................................................................................................... 29 ModifiedTables ...................................................................................................................................... 29 ModificationLog Table ........................................................................................................................... 29 Data Server Required Triggers in SQL Server Spatial ......................................................................... 34 SQL Server Spatial Indexing ................................................................................................................. 35 Working with SQL Server Spatial ............................................................................................................ 37 Using Existing Native Spatial Data ....................................................................................................... 38 Importing Spatial Data .......................................................................................................................... 39 Existing Standard SQL Server Data ..................................................................................................... 40 Feature Class Definition ........................................................................................................................ 40 Undo/Redo ............................................................................................................................................ 41 Default Values ....................................................................................................................................... 41 Spatial Filtering ..................................................................................................................................... 41 Views and Join Views ........................................................................................................................... 42 GeoMedia SQL Server Spatial User Guide 3 Contents Database Utilities ....................................................................................................................................... 43 Exporting to SQL Server ........................................................................................................................... 45 Technical Support and Information ......................................................................................................... 49 Self-Help Support Tools ........................................................................................................................ 49 Phone Numbers .................................................................................................................................... 49 Other Links ............................................................................................................................................ 51 Index ........................................................................................................................................................... 53 4 GeoMedia SQL Server Spatial User Guide SECTION 1 Introduction The SQL Server Spatial data server is an add-on component for GeoMedia Professional that makes it easier to connect to Microsoft’s Sequel Server (SQL Server 2008 or later) databases that use native spatial geometry storage. This allows GeoMedia applications to use native SQL Server Spatial databases as geospatial warehouses. Once installed, the data server is accessed through GeoMedia Professional's Warehouse > New Connection command. Delivery and Connection Prerequisites SQL Server connections do not require client software. The SQL Server Spatial data server will be installed whether SQL Server is present or not. Connections can be made to SQL Server installations that are configured as case-sensitive or case-insensitive. Both Windows authentication and SQL Server authentication are supported for user accounts. A SQL Server database must already exist and must have the required metadata tables before a SQL Server connection can be made. The data server has full read-write capability, but the ability to access and edit database objects is controlled by the privileges on the login account used for the database connection. Connections GeoMedia applications require specific metadata tables to exist in the SQL Server database before a connection can be made. This metadata is created using GeoMedia Professional's Database Utilities or during the bulk import of data from GeoMedia Professional’s Export to SQL Server command. The metadata used by the SQL Server spatial data server is different from the metadata used by the standard SQL Server data server, and they cannot be used interchangeably. See the GeoMedia Metadata Requirements section of this document for a list of the required tables. To make a connection to SQL Server, provide a valid server name, and then a valid username and password. Any databases the specified user has privilege to see will appear in the GeoMedia SQL Server Spatial User Guide 5 Delivery and Connection drop-down database list. SQL Server has two modes for validating users: authentication and SQL Server authentication. Windows domain If the SQL Server connection is set to use Windows authentication (the default), your domain login account will need to be added to SQL Server by a database administrator and appropriate privileges will need to be granted on the databases you want to access. On connection, you will only need to supply the server name and the database name. If you are using SQL Server authentication, you will need to have a valid SQL Server user account and password as well as the appropriate privileges on the database you want to connect to. Password Persistence When using SQL Server authentication, GeoMedia stores the SQL Server connection password in the GeoWorkspace. This is meant as a convenience and allows users to open existing GeoWorkspaces containing SQL Server connections without having to re-enter connection passwords. However, this is a drawback to those users wanting higher levels of security. If you do not want the passwords to be persisted in the GeoWorkspace, you must use domain authentication. Domain authenticated connections do not store any user or password information in the GeoWorkspace and have the added benefit of not prompting you to re-enter passwords. Permissions In SQL Server warehouses, access to database objects is controlled by the object’s owner through the use of permissions. GeoMedia requires all objects in your SQL Server database to be in the DBO schema. Objects that are not owned by DBO will not be accessible or visible in GeoMedia except by the user who created them. When creating database objects using GeoMedia Professional’s Feature Class Definition command, the user account must be assigned the db_owner role. For database objects created outside of GeoMedia Professional, only a user account with the role db_owner will ensure that the resulting objects are in the DBO schema. SQL server users who need to be restricted to read-only access should be assigned the db_datareader role, and users who need read-write access should be assigned the db_datawriter role. All other specific SQL Server privileges are honored as long as the DBO ownership criterion is met when creating database objects. 6 GeoMedia SQL Server Spatial User Guide Delivery and Connection There are also four scalar functions that are required for any access to native spatial data through GeoMedia. Execute privileges are required on these four functions for any user who does not have the db_owner role. See the Scalar Functions section for more information. SQL Server Warehouse Requirements Connections to SQL Server spatial warehouses have several restrictions and requirements that must be adhered to. Violation of any of these requirements may lead to a connection failure or the inability to load data from the connection. These connection requirements and restrictions are listed below: All geometries are stored in 3 dimensions; 2 dimensional geometries are not supported. All non-system SQL Server database objects must be owned by DBO. objects in the database must have the db_owner role. Names of tables, views, indexes, and fields are always expressed in their defined cases. The server will preserve the case of identifiers but will be case-insensitive on comparisons. Users who create Comparisons on data values will be case-sensitive, so caution is advised when identifier names are stored in the database. A local SQL Server client is not required; however, client-side administrative tools are required when importing data generated by the Export to SQL Server command. The server drop-down list on the New Connection dialog box is only populated when SQL Server agents are active. Do not use SQL Server’s TIMESTAMP data type. This data type is not related to date/time functions and is not supported. A list of supported data types is presented in the SQL Server to GeoMedia Data Type Matching section. Data types that do not appear in this list are not supported and are generally ignored by the data server. All DML operations (inserts, updates, and deletes) will require a clustered primary key. Both multi-column and character-based primary keys are allowed but are not recommended for insert operations as the user will need to manually enter the appropriate key value. For the best results and the best performance, use an integer-based auto-increment (identity) primary key column. Views are editable as long as they are key preserved and have the appropriate metadata entries in the GIndexColumns table. Any column in the view that is both unique and not null can act as the pseudo primary key. Even when key preserved, DML operations on join-views will require the use of instead of triggers. GeoMedia SQL Server Spatial User Guide 7 Delivery and Connection 8 GeoMedia metadata must be present before making a connection to the database. The required metadata can be created using GeoMedia Professional's Database Utilities or using the metadata script created by the Export to SQL Server command. Metadata entries must exist for all tables and views for them to be visible in the GeoMedia environment. Database Utilities can be used to make the metadata assignments. GeoMedia SQL Server Spatial User Guide Data Storage and Type Matching Data Storage and Type Matching Geometry Storage The SQL Server Spatial data server uses two storage columns: one column is used to store the SQL Server's native spatial data types (GEOMETRY or GEOGRAPHY); the second one is a binary column (varbinary(max)) storing the GDO (GeoMedia Data Object - GeoMedia's native binary storage format) geometry blob used for unsupported geometries (for example, arcs, oriented points, text, and raster). The default native storage data type is GEOMETRY because most data is assumed to be projected. The GEOGRAPHY data type is fully supported as well but will require the use of an EPSG spatial reference system identifier (SRID). For geographic data, each feature must fit inside a single hemisphere. Objects larger than a single hemisphere are not supported and may throw an argument exception. Geographic spatial filter areas must also fit inside a single hemisphere. The default geometry type used by GeoMedia Professional's Feature Class Definition command (or any other GeoMedia command that creates a table) is determined by the TypeForNativeGeometryStorage parameter in the GParameters metadata. The default spatial reference system identifier (SRID) is 0 because that is what SQL Server expects for GEOMETRY data types. SQL Server does not store the EPSG SRID's for projected data, and a NULL SRID is not allowed. For GEOGRAPHY data types, a valid SRID is required, and it must be one of the EPSG SRIDs currently stored in SQL Server's sys.spatial_reference_systems table. The default SRID used by GeoMedia Professional's Feature Class Definition command (or any other GeoMedia command that creates a table) is determined by the DefaultNativeGeometrySrid parameter in the GParameters metadata table. Every native spatial geometry column must have a corresponding GeoMedia binary column. If the table is created using Feature Class Definition, the following columns are present in the base table for the feature: GeoMedia SQL Server Spatial User Guide 9 Data Storage and Type Matching Name Data Type Description <geometry_column_name> varbinary(MAX) The binary GDO geometry column. <geometry_column_name SPA GEOMETRY/GEOGRAPHY Native geometry column. The native geometry column in SQL Server (<GDO geometry name>_SPA) stores the exact representation for geometries that are currently supported by SQL Server. For unsupported GeoMedia geometry types, an approximation of the GeoMedia geometry type is stored in the native geometry column while the actual geometry is stored in the varbinary column. The approximation is, as follows: The point origin for GeoMedia's OrientedPointGeometry The text origin for GeoMedia's TextPointGeometry A line geometry for GeoMedia's PolylineGeometry. In this case the geometry is represented exactly in its native format, but because the polylines are converted back from native line format, they are also stored in the GDO column to have the information about its type – a two-point PolylineGeometry is the same as LineGeometry in native format. A two-point polyline for GeoMedia's LineGeometry. In this case the geometry is represented exactly in native format, but because the line geometries are converted back from the native polyline format, they are also stored in the GDO column to provide the information about its type. Any and all items required for GeoMedia's CompositePolylineGeometry, even if all the items are fully supported by the underlying data source, since there is no way to convert it back to GeoMedia's CompositePolylineGeometry from native format. Any and all items required for GeoMedia's CompositePolygonGeometry, even if all the items are fully supported by the underlying data source, because there is no way to convert it back to GeoMedia's CompositePolygonGeometry from native format. Any and all items required for GeoMedia's GeometryCollection. The varbinary column is used only if any of the items are not fully supported by SQL Server's geometry. The raster footprint for GeoMedia's RasterGeometry. For tables created outside Feature Class Definition, the varbinary column Used by GeoMedia must be added manually, and GeoMedia's metadata must indicate the relationship between the native geometry column and the varbinary column. GeoMedia's metadata must be 10 GeoMedia SQL Server Spatial User Guide Data Storage and Type Matching manually inserted for each table using Database Utilities before GeoMedia recognizes these as feature classes. The use of _SPA is just a naming convention used by GeoMedia applications; you do not need to use this naming convention if you are creating or modifying tables outside of GeoMedia applications, as long as the metadata reflects the association between the GDO geometry and the native geometry column. GeoMedia's Binary Geometry to Native Geometry Type Matching To write geometric data to SQL Server, GeoMedia’s SQL Server Spatial data server converts GeoMedia native GDO geometry format to SQL Server native spatial format using the following: GeoMedia Geometry Type SQL Server Geometry Type GDO column content Native column content PointGeometry POINT (x y z) OrientedPointGeometry POINT (x y z) Full GDO Exact point, no orientation TextPointGeometry POINT (x y z) Full GDO Point origin LineGeometry LINESTRING( Full GDO Two-point linestring Exact point x1 y1 z1, x2 y2 z2) PolylineGeometry LINESTRING( N-point linestring x1 y1 z1, …, xN yN zN) ArcGeometry LINESTRING( x1 y1 z1, Full GDO Stroked N-point linestring …, xN yN zN) GeoMedia SQL Server Spatial User Guide 11 Data Storage and Type Matching GeoMedia Geometry Type SQL Server Geometry Type CompositePolylineGeometry MULTILINESTRING( ( x11 y11 z11, …, xN1 yN1 zN1 GDO column content Native column content Full GDO, even when no member is approximated, in order to recreate composite. Composite members need to be approximated (like arcs) in a multiline string; otherwise, exact multiline string. ), …, (x1M y1M z1M, …, xNM yNM zNM )) PolygonGeometry POLYGON( Exact polygon ( x1 y1 z1, …, xN yN zN )) CompositePolygonGeometry MULTILINESTRING( ( x11 y11 z11, …, xN1 yN1 zN1 ), …, Full GDO, even when no member is approximated, in order to recreate composite. Composite members need to be approximated (like arcs) in a closed multiline string; otherwise. exact closed multiline string. (x1M y1M z1M, …, xNM yNM zNM )) 12 GeoMedia SQL Server Spatial User Guide Data Storage and Type Matching GeoMedia Geometry Type SQL Server Geometry Type GDO column content Native column content BoundaryGeometry POLYGON( Full GDO if any of the members (exterior, interior) cannot be represented fully by native type; otherwise, this column will be null. Composite members need to be approximated (like arcs) in a polygon string; otherwise, exact polygon string. Full GDO Exact polygon of the raster footprint. Full GDO if any of the members A collection of exact representations or ( x1_int y1_int z1_int, …, xN_int yN_int zN_int ), ( x11_ext y11_ext z11_ext, …, xN1_ext yN1_ext zN1_ext) ), …, ( x11M_ext y11M_ext z11M_ext, …, xN1M_ext yN1M_ext zN1M_ext) )) RasterGeometry POLYGON ( x1 y1 z1, x2 y2 z2, x3 y3 z3, x4 y4 z4, x1 y1 z1) GeometryCollection MULTPOINT for point GeoMedia SQL Server Spatial User Guide 13 Data Storage and Type Matching GeoMedia Geometry Type SQL Server Geometry Type GDO column content geometries, (exterior, interior) MULTILINESTRING for cannot be represented fully line geometries, by native type; MULTIPOLYGON for otherwise, this area geometries, column will be GEOMETRYCOLLECTIO NULL. N when mixed Native column content approximations, according to the rules established above, for each GDO collection member. SQL Server to GeoMedia Data Type Matching To use data from SQL Server, GeoMedia’s SQL Server Spatial data server converts SQL Server data types to GeoMedia data types. The following table shows how the SQL Server data types are mapped to the GeoMedia types. Any SQL Server data types missing from this list are considered unsupported and are ignored. 14 SQL Server Data Type GeoMedia Data Type binary varbinary LongBinary bit Boolean char(size) varchar(size) nchar(size) nvarchar(size) ntext* Text if size <= 255 Memo otherwise datetime smalldatetime Date decimal(p,s) or numeric(p,s) p is precision s is scale Integer if s = 0 and p < 6 Long if s = 0 and p >= 6 and p < 11 Double for all other cases. float Double *Memo only GeoMedia SQL Server Spatial User Guide Data Storage and Type Matching SQL Server Data Type GeoMedia Data Type binary varbinary LongBinary int Long money Currency real Single smallint Integer tinyint Byte uniqueidentifier GUID GeoMedia to SQL Server Data Type Matching The following table identifies the mapping used when converting from GeoMedia data types to SQL Server data types and whether specific metadata is required for the mapping: GeoMedia Data Type SQL Server Data Type Metadata Required? Boolean bit No Byte tinyint No Integer smallint Yes for autonumber Long int No Single real No Double float No Currency money No Date datetime No Text nvarchar No LongBinary varbinary No Memo ntext No GUID uniqueidentifier No GeoMedia SQL Server Spatial User Guide 15 GeoMedia Metadata Requirements GeoMedia Metadata Requirements GeoMedia applications require specific metadata objects, and these must exist in the SQL Server database before a connection can occur. GeoMedia's metadata tables contain information about both the attribute and geometry tables stored in the database. The metadata functions control the follow of geometry data to and from GeoMedia applications. The following table lists the required metadata and its object type. 16 GeoMedia Metadata Objects Type AttributeProperties Table FieldLookup Table GAliasTable Table GCoordSystem Table GeometryProperties Table GFeatures Table GFieldMapping Table GIndexColumns Table GParameters Table GPickLists Table GQueue Table GTileIndexes Table ModifiedTables View ModificationLog Table Binary2SqlGeography Function Binary2SqlGeometry Function SqlGeography2Binary Function SqlGeometry2Binary Function GeoMedia SQL Server Spatial User Guide GeoMedia Metadata Requirements To create GeoMedia's required metadata objects, you must use one of the following methods: Database Utilities – Use Database Utilities from the GeoMedia Professional program group. Enter the server name and login as the database owner (or administrator). When connected, select the Create Metadata Tables command. This is the preferred method and is also the method to use when updating the metadata objects as new releases become available. Export to SQL Server – You can also create the required metadata tables during bulk loading when using the import.bat command file created by the Export to SQL Server command in GeoMedia Professional by setting the sixth parameter to Y. The metadata.sql file generated by Export to SQL Server can also be run directly in SQL Server's Management Console. Scalar Functions Internally, GeoMedia utilizes binary format for WKB data so it converts SQL Server's GEOMETRY/GEOGRAPHY data type to/from binary when reading/writing native geometry records. It uses the following four scalar functions to do the conversion: Binary2SqlGeography – Converts GeoMedia's binary data type to the native GEOGRAPHY data type when writing WKB geographic data. Binary2SqlGeometry – Converts GeoMedia's binary data type to the native GEOMETRY data type when writing WKB geometry data. SqlGeography2Binary – Converts native GEOGRAPHY data type to GeoMedia's binary data type when reading WKB data. SqlGeometry2Binary – Converts native GEOMETRY data type to GeoMedia's binary data type when reading WKB data. Execute privileges are required on these four functions for any login to a SQL Server database that does not have the db_owner role. These functions only convert the data type used to store the data; they do not convert data between WKB and GDO formats. GeoMedia SQL Server Spatial User Guide 17 GeoMedia Metadata Requirements AttributeProperties Table The AttributeProperties metadata table describes the attribute types for the columns listed in the FieldLookup table. The common link between this table and FieldLookup is the IndexID column. The AttributeProperties table is defined, as follows: IndexID – Uniquely identifies the column being described. the FieldLookup table. IsKeyField – Determines whether a column is a primary key field. FALSE. Use -1 (TRUE) if the column is a primary key. IsFieldDisplayable – Determines whether a column is displayed in GeoMedia Professional. The default value is -1 for TRUE. Use 0 (FALSE) to hide the column. FieldType – Determines how GeoMedia interprets the data type used in the column definition. These are based on the conversion from SQL Server to GeoMedia data types. The field type values correspond to the following: 1 – Boolean 18 The IndexID value comes from The default value is 0 for 8 – Date 2 – Byte 10 – Text 3 – Integer 11 – Binary 4 – Long 12 – Memo 5 – Currency 15 – GUID 6 – Single 32 – Spatial geometry 7 – Double 33 – Graphic geometry FieldPrecision – Represents the number of decimal places displayed in GeoMedia Professional. For numeric data types, the default is 6. Usually, this is the same as the scale defined for the number field. GeoMedia SQL Server Spatial User Guide GeoMedia Metadata Requirements FieldFormat – Determines the general format of the data being displayed. include General Number, Date/Time, and Currency. FieldDescription – A user-provided description of the column. Format types FieldLookup Table The FieldLookup metadata table provides a unique identifier (IndexID) for every column in every table/view in the database. The table definition is, as follows: IndexID – This key column contains a unique identifier for every column in every table in the database. It is populated using an identity increment. FeatureName – The table name. FieldName – Stores each column name for the associated feature name. The IndexID is used as a reference by other metadata tables like AttributeProperties and GeometryProperties, which are used to describe the columns and their contents. GAliasTable The GAliasTable metadata table determines the names of the other metadata tables used by GeoMedia Professional. The GAliasTable is the only metadata table whose name is hard coded. This table must exist and cannot be modified or altered in any way. The table definition is, as follows: TableType – This key column contains an internal reference name used by GeoMedia applications. TableName – This is the table name used by the associated table type. required for each table type. GeoMedia SQL Server Spatial User Guide A table or view is 19 GeoMedia Metadata Requirements GCoordSystem Table The GCoordSystem metadata table stores GeoMedia's coordinate system definitions. If this table is not present, no coordinate system transformation will occur, and the GeoWorkspace coordinate system will be used. This table is not user editable and is not listed due to the large number of columns and types of parameters required to define a coordinate system. This table should never be populated manually. There are three columns worth noting: Name – The name the user has assigned to this coordinate system. This is an optional parameter, but it should be used because it makes the coordinate system easier to identify, particularly if multiple coordinate systems are used in the database. Description – A user-provided description of the coordinate system. like the name, it can also be useful. CSGUID – The CSGUID is a special value used to uniquely identify the coordinate system parameters. The CSGUID is used to associate a geometry object to a GeoMedia coordinate system. The CSGUID is also referenced in GeometryProperties and in GFieldMapping. This is optional, but Coordinate systems should be created using GeoMedia Professional's Define Coordinate System command. When a defined coordinate system is assigned to a feature class, the parameters that make up the coordinate system are inserted into the database table. Any feature class that uses the coordinate system is assigned the CSGUID for that coordinate system. Coordinate systems are defined on a per-feature-class basis. Each feature class can have its own coordinate system. If the database has a default coordinate system defined using the DefaultCoordinateSystem parameter in the GParameters table, feature classes created using the Feature Class Definition, Output to Feature Classes, or Export to SQL Server commands will automatically use the default. Outside of GeoMedia Professional, you will need to use the Database Utilities command, which is available in the GeoMedia Professional program group. If you have incorrectly assigned a coordinate system to a feature class, you can also use the Database Utilities to correct the assigned coordinate system. If you plan to use multiple coordinate systems in your SQL Server database, you need to assign one coordinate system to use as a default. Default coordinate systems can be assigned using Database Utilities or Feature Class Definition. Only one default coordinate system is allowed per database. The CSGUID of the default coordinate system is stored in the DefaultCoordinateSystem parameter in the GParameters metadata table. 20 GeoMedia SQL Server Spatial User Guide GeoMedia Metadata Requirements When digitizing in GeoMedia Professional, you should ensure that the GeoWorkspace coordinate system matches the coordinate system of the feature class into which you are digitizing. This is not always required, but depending on the coordinate transformation used, conversion errors can occur when the coordinates are written to the database. GeoMedia Professional will compare the GeoWorkspace coordinate system to the coordinate system of the feature you select for editing and will warn you if there is a mismatch. It will be up to the user to rectify or ignore the mismatch. One example where a difference is required is when editing geographic data in the polar regions; in this case, your workspace should be set to either north or south polar stereographic. GeometryProperties Table The GeometryProperties metadata table stores the geometry type, primary geometry flag, and the coordinate system ID for geometry columns contained by feature classes. The common link between this table and FieldLookup is the IndexID column. The table definition is, as follows: IndexID – This key field links the information to the actual column defined in the FieldLookUp table. PrimaryGeometryFlag – A feature class can contain multiple geometry fields, but only one field is allowed to be primary. The primary geometry field is the field that allows for editing. A value of -1 means the geometry column is the primary geometry. All other geometry columns in the feature class should be assigned 0. Only one primary geometry field is allowed. GeometryType – This field determines how the data server maps the geometry: 1 – Line 2 – Area 3 – AnySpatial 4 – Coverage 5 – GraphicsText 10 – Point GCoordSystemGUID – This field contains the CSGUID from the GCoordSystem table. the data server what coordinate system is assigned to the geometry. GeoMedia SQL Server Spatial User Guide It tells 21 GeoMedia Metadata Requirements FieldDescription – A user-provided description of the column. GFeatures Table The GFeatures metadata table stores the table names of all user tables (feature classes). manipulating the tables listed here, you can make feature classes visible or invisible in GeoMedia. The table definition is, as follows: By FeatureName – This key column contains the name of the table that will be exposed as a feature class in GeoMedia applications. This table is used by every command in GeoMedia Professional that lists the available feature classes, for example, Add Legend Entries. GeometryType – This field determines how the data server maps the geometry. 1 – Line 2 – Area 3 – AnySpatial 4 – Coverage 33 – GraphicsText 10 – Point -1 – Attribute only (no geometry field) 22 PrimaryGeometryFieldName – The name of the primary geometry column. FeatureDescription – A user-provided description of the column. GeoMedia SQL Server Spatial User Guide GeoMedia Metadata Requirements GFieldMapping Table The GFieldMapping metadata table is used to override various aspects of column definitions. Information stored here typically consists of the primary key column and the primary geometry with their associated GeoMedia data types, the coordinate system ID, and any assigned autonumber types. This table also defines the relationship between the native geometry storage column and the GeoMedia binary geometry column. The table definition is, as follows: TABLE_NAME – The name of the table. COLUMN_NAME – The column in the table that this information apples to. The TABLE_NAME/COLUMN_NAME combination makes up the primary key. DATA_TYPE – Determines how GeoMedia interprets the data type used in the column definition. Field type values include the following types (these are derived from the SQL Server to GeoMedia data type matching table): 1 – Boolean 8 – Date 2 – Byte 10 – Text 3 – Integer 11 – Binary 4 – Long 12 – Memo 5 – Currency 15 – GUID 6 – Single 32 – Spatial geometry 7 – Double 33 – Graphic geometry DATA_SUBTYPE – Used when the DATA_TYPE is 32 or 33; the subtype determines the graphic type: GeoMedia SQL Server Spatial User Guide 23 GeoMedia Metadata Requirements 1 – Line 2 – Area 3 – AnySpatial 4 – Coverage 5 – GraphicsText 10 – Point CSGUID – The coordinate system assigned to the primary geometry field. AUTOINCREMENT – A Boolean field indicating that the field is set to auto-increment. -1 for True; otherwise, the value is NULL. NATIVE_GEOMETRY – This column is used to match the native geometry column with its associated GeoMedia binary geometry column. NATIVE_SRID – This column contains the SRID of the native geometry field. Typically it will be 0 for GEOMETRY type fields. For GEOGRAPHY types, it should reflect an SRID value that is defined in SQL Server's sys.spatial_reference_systems table. Use GIndexColumns Table The GIndexColumns metadata table is used to specify the column or columns in a view that can act as primary or unique key fields. This table is populated using Database Utilities. The table definition is, as follows: 24 The primary key is a combination of the OBJECT_SCHEMA, OBJECT_NAME, INDEX_NAME, and COLUMN_NAME fields. OBJECT_SCHEMA – The owner of the view (the default is 'dbo'). OBJECT_NAME – The name of the view. INDEX_NAME – The primary key index name from the base table. COLUMN_NAME – The name of a column in the view that will use the index in INDEX_NAME. GeoMedia SQL Server Spatial User Guide GeoMedia Metadata Requirements INDEX_TYPE – The type of the index: ‘P’ for primary, ‘U’ for unique. The default value is ‘P’. If this field is missing, the first index will be assumed to be the primary index. If a view does not have a key defined in the GIndexColumns, it will be read-only, and no DML operations will be allowed. COLUMN_POSITION – This field is the order of the column within the index. value is 1. BASE_OBJECT_SCHEMA – This field is the owner of the table (view) on which the view is based. If this field contains NULL (empty string), notification will not be supported. Only triggers can support notification in this case. BASE_OBJECT_NAME – This field is the name of the table (view) on which the view is based. If this field is missing or contains NULL (empty string), notification will not be supported. Only triggers can support notification in this case. BASE_COLUMN_NAME – This field is the name of the corresponding field of the base table/view. This field is used for name aliasing. If this field contains NULL (empty string), column name aliasing will not be supported. The default GParameters Table The GParameters metadata table contains the default values for the parameters needed to create new tables using GeoMedia Professional as well as other miscellaneous information, such as the default warehouse coordinate system. GeoMedia SQL Server Spatial User Guide 25 GeoMedia Metadata Requirements This table contains two fields, GPARAMETER and GVALUE. used by default: Currently, the following values are Never modify the values in the GPARAMETER column. The values used in the GVALUE column are user editable and these control how GeoMedia Professional creates tables in the database. These values mainly affect Feature Class Definition, but any GeoMedia Professional command that creates a table in the database will use these as defaults. Typically, you would edit the following: TypeForNativeGeometryStorage – This controls whether tables will be created using the GEOMETRY or the GEOGRAPHY data type. If you are using projected data, use GEOMETRY. If your data is GPS or longitude/latitude based, use GEOGRAPHY. DefaultNativeStorageSrid – This assigns the default SRID to use. If the TypeForNativeGeometryStorage is set to GEOMETRY, this value must be set to 0. If TypeForNativeGeometryStorage is set to GEOGRAPHY, this value must be set to an SRID that is currently supported by SQL Server. Use the following query for a list of the SRIDs currently supported by SQL Server: SELECT * FROM SYS.spatial_reference_systems 26 DefaultCoordinateSystem – This parameter contains the CSGUID from the GCoordSystem table that corresponds to a GeoMedia coordinate system that is to be used as the default for all feature classes created through the GeoMedia Professional environment. If the TypeForNativeGeometryStorage is set to GEOGRAPHY, this value should correspond to the CSGUID of a coordinate system in the GCoordSystem table that matches the coordinate system for the SRID used for the DefaultNativeStorageSrid. GeoMedia SQL Server Spatial User Guide GeoMedia Metadata Requirements XUpperBound, YUpperBound, XLowerBound, YLowerBound – These parameters control the MBR or bounding box range used by GeoMedia Professional when creating spatial indexes on geometry data types. Spatial indexes will perform better when the range used here more closely matches the range of the data indexed. Data that falls outside the range will not be indexed but will still be included in the results of the second pass filter, if applicable. Optimizing the spatial indexes for each feature class will improve performance and should be done at the database level. GeoMedia Professional will only create a default spatial index, and it may or may not be optimal. If you need to modify any of the other GPARAMETER/GVALUE pairs, you should first consult GeoMedia customer support. GPickLists Table The GPickLists metadata table contains the Picklist assignments used by both the Properties dialog box and the data window in GeoMedia Professional. Also known as domain lists, Picklists allow for a predefined list of values to be used when updating attribute fields. GPickLists is defined, as follows: The primary key is a combination of the FeatureName and FieldName columns. These columns refer to the feature class and the specific attribute field for which the Picklist is to be used. PickListTableName – Specifies a table in the schema containing the PickList values. ValueFieldName and DescriptionFieldName – Refers to the name of the columns in the table containing the Picklist values. ValueFieldName – Specifies the field in the Picklist table that contains the values to be stored in the database. The data type of the field in the Picklist table specified here must match the data type of the attribute assigned in the FieldName. DescriptionFieldName – Specifies the field that contains Picklist descriptions to be displayed in the pop-up menu on the Properties dialog box. GeoMedia SQL Server Spatial User Guide 27 GeoMedia Metadata Requirements The values stored in ValueFieldName and DescriptionFieldName could be the same when the displayed values are the same as the stored values. FilterClause – Is optional and may contain a SQL where clause that will be used to filter the records in the Picklist. The filter allows a single Picklist table to be used when creating multiple Picklists. Picklist tables can be any tables that contain the required information, including existing feature classes. You can implement a Picklist as a code list (using separate value and description entries) or as a domain list (when value and description entries are the same). Ranges are not supported. The Picklist metadata table can either be populated manually or by using the Picklist Manager utility. This utility is available from Intergraph Customer Support. For more information, visit the SG&I Support page (http://support.intergraph.com/). The following is an example of tables, columns, and values that could be defined for Picklists: GPickLists FEATURENAME FIELDNAME PICKLIST TABLENAME VALUE FIELDNAME DESCRIPTION FIELDNAME FILTERCLAUSE BUILDINGS NAME PL_BUILDING CODE_VALUE VAL_DESCRIPTION BLD_TYPE = 'NAME' BUILDINGS STATE PL_STATE STATE_NAME DESC BUILDINGS TYPE PL_BUILDING CODE_VALUE VAL_DESCRIPTION BLD_TYPE = 'TYPE' PL_Building CodeValue ValDescription Bld_Type 0 MOTEL TYPE 1 MARRIOT NAME 2 HOLIDAY INN NAME 3 BED AND BREAKFAST TYPE 4 DAYS INN NAME PL_State 28 StateName Desc Alabama ALABAMA Arkansas ARKANSAS GeoMedia SQL Server Spatial User Guide GeoMedia Metadata Requirements StateName Desc Colorado COLORADO Texas TEXAS Florida FLORIDA Queue Table The GQueue metadata table is used to store the static queues for the Queued Edit command. The columns in GQueue are populated through commands in GeoMedia Professional and are used solely by the Queued Edit command. This table is not user editable and should not be modified in any way. ModifiedTables ModifiedTables is a join view that provides the object ID for each table/view. The view uses an inner join between the sysobjects table and the sysindexes table in conjunction with a union on GIndexColumns. The ModifiedTableID in this view provides the values for the ModifiedTableID used in the ModificationLog table. This value is used to identify the edited table in the ModificationLog table. This view is not user editable and should not be modified in any way. ModificationLog Table The ModificationLog metadata table tracks modifications made from the GeoMedia environment for all feature classes in the connected schema. Specifically, it is used to track all inserts, updates, and changes made to tables/views listed in ModifiedTables. The ModifiedTableID is the common link between ModificationLog and ModifiedTables. The definition of the ModificationLog table is, as follows: GeoMedia SQL Server Spatial User Guide 29 GeoMedia Metadata Requirements ModificationNumber – The auto-increment key filed for the table. Type – The type of edit that has occurred: 1 for insert, 2 for update, and 3 for delete. ModifiedTableID – The column identifier from ModifiedTables. KeyValue1 to KeyValue10 – These fields store the primary key column values for the edited row. If there is only one primary key column, only KeyValue1 is used. For multi-column primary keys, the values from each field that makes up the key are stored here. A primary key can be made up of a maximum of 10 columns. SESSIONID – Identifies the SQL Server session making the edit. automatically from a function-based default value. ModifiedDate – Identifies the date and time of the edit. automatically from a function-based default value. This field is populated This field is populated The ModificationLog table is part of the GeoMedia notification system. All edits made to feature classes within the connected SQL Server database are tracked in the ModificationLog table. Over time, this table can grow very large very quickly. Because the size of the ModificationLog table can negatively affect editing performance in GeoMedia applications, the table should be periodically truncated. However, do not clear this table while there are open GeoMedia sessions. The Clear Modification Log command in Database Utilities will truncate this table. You can also use the following SQL to clear this table: Truncate Table dbo.ModificationLog 30 GeoMedia SQL Server Spatial User Guide GeoMedia Metadata Requirements You could also set up a SQL Server job to do this automatically; just make sure it runs when there are no active GeoMedia sessions. The ModificationLog table is currently only configured to track modifications made through the GeoMedia environment. Modifications to the data made outside of GeoMedia do not update the ModificationLog table; thus, GeoMedia sessions are not notified of those changes. To solve this issue, you can create triggers that will automatically provide modification logging. To prevent insert events from happening twice, the triggers must have names that are recognized by the SQL Server data server: The trigger for insert must have a name that corresponds to the feature class name appended by GMTI. The trigger for update must have a name that corresponds to the feature class name appended by GMTU. The trigger for delete must have a name that corresponds to the feature class name appended by GMTD. For example, if the feature class is States, the triggers must have the name StatesGMTI, StatesGMTU, and StatesGMTD. This rule holds true regardless of whether the feature class is a table or a view. When the triggers are detected, GeoMedia will offload all the modification logging for the specific feature class to the trigger. Each trigger fires on the specific editing event and writes an entry into the ModificationLog table: Type is populated with the following constants: ModifiedTableID is populated with the object ID of the object for which the entry is created. This field comes from the ModifiedTables view. KeyValue1 to KeyValue10 are populated by converting the primary key value to nvarchar(255). For a single column primary key, only KeyValue1 is populated. If the primary key consists of multiple columns, the additional columns can be added to KeyValue2 through KeyValue10. Primary keys consisting of more than 10 columns are not supported. 1 - Insert, 2 – Update, or 3 – Delete. If the primary key is user editable (non-composite or does not contain an identity field), all modifications must create two entries, one for the old key value and one for the new key value. The following are examples of the insert, update, and delete triggers for a feature class (table) called States, whose primary key column is ID: GeoMedia SQL Server Spatial User Guide 31 GeoMedia Metadata Requirements CREATE TRIGGER dbo.StatesGMTI ON dbo.States FOR INSERT AS DECLARE @TableID INT IF object_id('tempdb..#DisableModificationLog') IS null SELECT @TableID=ModifiedTableID FROM ModifiedTables WHERE TableName='States' INSERT INTO ModificationLog(Type,ModifiedTableID,KeyValue1) SELECT 1, CONVERT(nvarchar(20),@TableID),CONVERT(nvarchar(255), inserted.ID) FROM inserted GO -CREATE TRIGGER dbo.StatesGMTU ON dbo.States FOR UPDATE AS DECLARE @TableID INT IF object_id('tempdb..#DisableModificationLog') IS null SELECT @TableID=ModifiedTableID FROM ModifiedTables WHERE TableName='States' BEGIN IF update(ID) INSERT INTO ModificationLog(Type,ModifiedTableID,KeyValue1) SELECT 2, CONVERT(nvarchar(20),@TableID), CONVERT(nvarchar(255),deleted.ID) FROM deleted INSERT INTO ModificationLog([Type],ModifiedTableID,KeyValue1) SELECT 2, CONVERT(nvarchar(20),@TableID), CONVERT(nvarchar(255),inserted.ID) FROM inserted END GO -CREATE TRIGGER dbo.StatesGMTD ON dbo.States FOR DELETE AS DECLARE @TableID INT IF object_id('tempdb..#DisableModificationLog') IS null SELECT @TableID=ModifiedTableID FROM ModifiedTables WHERE TableName='States' INSERT INTO ModificationLog(Type,ModifiedTableID,KeyValue1) SELECT 3, CONVERT(nvarchar(20),@TableID), CONVERT(nvarchar(255), deleted.ID) FROM deleted GO 32 GeoMedia SQL Server Spatial User Guide GeoMedia Metadata Requirements -- To make this work with views, you need to add an entry to the base table trigger that handles the modification to the view. For example, if you have a simple view on States called STATES_VIEW, you could use the following trigger to handle notification for inserts: CREATE TRIGGER dbo.StatesGMTI ON dbo.States FOR INSERT AS DECLARE @TableID INT DECLARE @ViewID INT if object_id('tempdb..#DisableModificationLog') is null SELECT @TableID=ModifiedTableID FROM ModifiedTables WHERE TableName='States' INSERT INTO ModificationLog(Type,ModifiedTableID,KeyValue1) SELECT 1, convert(nvarchar(20),@TableID), convert(nvarchar(255), inserted.ID) FROM inserted SELECT @TableID=ModifiedTableID FROM ModifiedTables WHERE TableName='States_View' INSERT INTO ModificationLog(Type, ModifiedTableID,KeyValue1) SELECT 1, convert(nvarchar(20),@ViewID), convert(nvarchar(255), inserted.ID) FROM inserted GO The trigger in the above example will handle edit notification for both the table and the view, but GeoMedia will still attempt to write another notification for the view itself. To stop this second notification event, another trigger needs to be created on the view using the view name: CREATE TRIGGER dbo.States_View_GMTI ON dbo.States FOR INSERT AS DECLARE @TableID INT if object_id('tempdb..#DisableModificationLog') is null SELECT @TableID=ModifiedTableID FROM ModifiedTables WHERE TableName='States_View' GO The trigger itself is still on the base table States; it is only the name of the trigger that refers to the view. This is essentially a dummy trigger; it does not do anything other than telling GeoMedia not to write directly to the ModificationLog table. GeoMedia SQL Server Spatial User Guide 33 GeoMedia Metadata Requirements When you edit through a view, it is the underlying base table that is actually edited, and in that case, a modification log trigger is required. This becomes more complicated as more views are added on the same base table. Every update to the base table should also update the ModificationLog table for every view that is dependent on the base table. For join views, you will need to take into account all the base tables and associated views. In the case of join views, most editing would be handled through instead of triggers. In this case, you could embed the insert into the ModificationLog table directly using the instead of trigger as long as the trigger name adheres to the rules listed above. Data Server Required Triggers in SQL Server Spatial To maintain the relationship between the native geometry and GeoMedia's binary GDO geometry, an after-insert and an after-update trigger are required for every table. When a native geometry column is inserted/updated outside of GeoMedia, this trigger sets GeoMedia's binary GDO geometry to NULL. The next time the data is read by the data server, the binary GDO column value will be reconstructed from the native value. These triggers are automatically created for every feature class created by GeoMedia Professional. If you create your tables outside of the GeoMedia Professional environment, you will need to manually add these triggers. The general format for each of these triggers is shown below: CREATE TRIGGER <tablename>_<native_geom_col>_INS ON <tablename> AFTER INSERT AS BEGIN SET NOCOUNT ON; IF EXISTS (SELECT NULL FROM INSERTED WHERE INSERTED.<native_geom_col> IS NULL AND INSERTED.<gdo_geom_col> IS NOT NULL) BEGIN RAISERROR (N'Unsupported. Cannot specify value for GDO column only, native column value must also be provided.', 0, 1) ROLLBACK TRANSACTION END; END; GO CREATE TRIGGER <tablename>_<native_geom_col>_UPG AFTER UPDATE AS BEGIN SET NOCOUNT ON; 34 GeoMedia SQL Server Spatial User Guide GeoMedia Metadata Requirements IF UPDATE(<native_geom_col>) BEGIN IF NOT UPDATE(<gdo_geom_col>) BEGIN UPDATE <tablename> SET <gdo_geom_col> = NULL WHERE EXISTS (SELECT NULL FROM INSERTED WHERE INSERTED.<primaryKeyColumn> = <tablename>.<primaryKeyColumn> END END ELSE IF UPDATE(<gdo_geom_col>) BEGIN RAISERROR ('Unsupported. Cannot specify value for GDO column only, native column value must also be provided.', 0, 1) ROLLBACK TRANSACTION END END; GO The use of these triggers can mean data loss is possible for some types of geometries. For example, if an OrientedPointGeometry is stored in SQL Server, GeoMedia's binary GDO geometry field contains the actual oriented point geometry, while the native geometry field stores only the point location. When a non-GeoMedia client updates the native POINT (x y z) geometry, the orientation vector is lost. A more complicated scenario occurs when arcs are stored in the binary GDOgeometry and corresponding stroked polylines are stored in the native geometry. In this case, information referencing the geometry as an arc will be lost, and its stroked PolylineGeometry will remain. SQL Server Spatial Indexing Spatial filtering in GeoMedia will use standard SQL Server spatial filtering operations. These rely on spatial indexes on the native geometry fields. For tables created using GeoMedia Professional, the spatial indexes are created automatically using the syntax below. For native geometries using the GEOGRAPHY data type, the spatial index is created using the following syntax: CREATE SPATIAL INDEX <TABLE_NAME>_<NATIVE_COLUMN_NAME>_sindx ON <TABLE_NAME> (<NATIVE_COLUMN_NAME>); For native geometries using the GEOMETRY data type, the spatial index is created using the following syntax: GeoMedia SQL Server Spatial User Guide 35 GeoMedia Metadata Requirements CREATE SPATIAL INDEX <TABLE_NAME>_<NATIVE_COLUMN_NAME>_sindx ON <TABLE_NAME> (<NATIVE_COLUMN_NAME>) WITH (BOUNDING_BOX = (<XLowerBound>, <YLowerBound>, <XUpperBound>, <YUpperBound>)) where <XLowerBound>, <YLowerBound>, <XUpperBound>, <YUpperBound> are taken from the GParameters table. For existing tables that contain native geometries, the database administrator should ensure that the spatial indexes exist and are up to date. Spatial indexes can only be created on tables that have a clustered primary key. The maximum number of key columns allowed on any given table is 15, and the maximum size of the index key records is 895 bytes. The primary key definition cannot be changed while the spatial index exists. For best performance, use a single integer-based primary key populated by an identity increment. The parameters used to create a spatial index, particularly for projected data, can have a large effect on overall query performance. Refer to SQL Server Books Online for more information on creating and optimizing spatial indexes. A default spatial index is automatically created whenever a table is created via GeoMedia, but there is no guarantee that this index will be optimal. For best performance, you should optimize every spatial index for the specific geometry stored and periodically rebuild the index as new data is entered. 36 GeoMedia SQL Server Spatial User Guide Working with SQL Server Spatial Working with SQL Server Spatial GeoMedia Professional's SQL Server native spatial data server utilizes two distinct columns in a SQL Server table to store the binary representation of spatial vector data. Its stores SQL Server's native spatial format (WKB – well known binary) in a column using the native GEOMETRY/GEOGRAPHY data type and stores GeoMedia's GDO format in a column using the VARBINARY(max) data type (for those geometries that are not directly supported by native spatial). For every native spatial column in a table, there must be a corresponding GDO column, and the association must be stored in GeoMedia's GFieldMapping metadata table. For existing native spatial data, the GDO column will have to be added and the association made via Database Utilities. Initially, the GDO column will only contain NULL rows. During GeoMedia INSERT and UPDATE operations, the data server will automatically populate records in both columns using GDO format for the varbinary column and WKB for the native geometry. This ensures that geometry types that are currently not supported by SQL Server can still be retrieved from the GDO column while a close approximation is stored in the native geometry column (see the section GeoMedia's Binary Geometry to Native Geometry Type Matching for more information). During an INSERT operation, a trigger fires to verify that if a new geometry record is inserted into the GDO column, the same (or a close approximation) geometry is also inserted into the corresponding row of the native geometry column. Every geometry record in the GDO column must always have a corresponding geometry record in the native geometry column (the native geometry record cannot be NULL if there is a GDO record). However, a new geometry record can be inserted into the native geometry column without a corresponding record being inserted into the GDO column (the GDO record can be NULL). During an UPDATE operation, a trigger fires to verify that if only the row in the native geometry column is being updated, the corresponding row in the GDO column is set to NULL. This situation would only happen if the native geometry record was edited outside of the GeoMedia environment. If GeoMedia detects a NULL row in the GDO column, it will read the corresponding row from the native geometry column. The next time an update on this same row occurs in GeoMedia, the corresponding row in the GDO column will again be populated. While this ensures that the geometry records remain in sync, it can lead to loss of data in some cases. For example, if you have a rotated point that is used for symbology and the native geometry for that point is edited outside of GeoMedia, the rotation value will revert to zero because the corresponding row in the GDO column will be set to NULL and GeoMedia will only GeoMedia SQL Server Spatial User Guide 37 Working with SQL Server Spatial read the native geometry the next time the point is displayed. You would have to reset the point's rotation using GeoMedia which would replace the NULL record in the GDO column with the current native geometry and the updated point rotation. Using Existing Native Spatial Data If you have existing native spatial data, it must be 3D; 2D geometries are not supported. You will also need to add a varbinary(max) column to support GeoMedia's binary GDO geometry format used for unsupported geometries (for example, arcs, oriented points, text, and raster). This column can be named anything, but it is best to make it similar to the column name of the native geometry. This will make associating the two columns a lot easier when metadata is assigned using Database Utilities. For example, if the table ROADS contains a native geometry column called CENTERLINE and an identity-based primary key called ID, you need to add a new column called CENTERLINE_GDO: ALTER TABLE ROADS ADD COLUMN CENTERLINE_GDO VARBINARY(MAX) GO Each table also requires two maintenance triggers for the additional GDO column: an after insert and an after update trigger. See the Data Server Required Triggers in SQL Server Spatial section for more information. For the example ROADS table listed above, the triggers would look like the following: CREATE TRIGGER [dbo].[ROADS_GEOMETRY_INS] ON [dbo].[ROADS] AFTER INSERT AS BEGIN SET NOCOUNT ON; IF EXISTS (SELECT NULL FROM INSERTED WHERE INSERTED.[CENTERLINE] IS NULL AND INSERTED.[CENTERLINE_GDO] IS NOT NULL) BEGIN RAISERROR(N'Unsupported. Cannot specify value for GDO column only, native column value must also be provided.', 0, 1) ROLLBACK TRANSACTION END END; GO CREATE TRIGGER [ROADS_GEOMETRY_UPG] ON [dbo].[ROADS] AFTER UPDATE AS BEGIN SET NOCOUNT ON; IF UPDATE([CENTERLINE]) BEGIN 38 GeoMedia SQL Server Spatial User Guide Working with SQL Server Spatial IF NOT UPDATE([CENTERLINE_GDO]) BEGIN UPDATE [ROADS] SET [CENTERLINE_GDO] = NULL WHERE EXISTS (SELECT NULL FROM INSERTED WHERE INSERTED.[ID] = [ROADS].[ID]) END END ELSE IF UPDATE([CENTERLINE_GDO]) BEGIN RAISERROR('Unsupported. Cannot specify value for GDO column only, native column value must also be provided.', 0, 1) ROLLBACK TRANSACTION END END; GO Once the binary column and the triggers have been added, you will need to add the metadata tables required by GeoMedia applications and then add the metadata entries for each table you want to use as a feature class. You can use Database Utilities for both of these operations. Importing Spatial Data The easiest way to get started using the SQL Server Spatial data server is by bulk importing data from another data source. GeoMedia Professional has two commands that will move data to SQL Server warehouses, Export to SQL Server and Output to Feature Classes. Export to SQL Server creates a set of files and an import.bat script that will load a SQL Server database from any data source that GeoMedia Professional is connected to. The process will use the coordinate system of the GeoWorkspace for the output. The resulting export files use SQL Server’s CMDSQL and BCP to load the data. For this reason, imports can only be run on a SQL Server Administrative Client or on the system where SQL Server is installed. This method is very fast and is ideal for bulk loading large amounts of data (>1000000 rows per table). This method also allows you to optionally create the required metadata tables. Output to Feature Classes requires that metadata tables already exist in the target SQL Server database. To manually create the metadata, use GeoMedia Professional’s Database Utilities, connect to the new database using an account with the db_owner role, and then click Create Metadata Tables. Once the metadata is created, you will be able to connect to the warehouse through GeoMedia Professional and then use Output to Feature Classes to create feature classes. This command is very flexible and allows you to make modifications to the GeoMedia SQL Server Spatial User Guide 39 Working with SQL Server Spatial table/column definitions, key definitions, and coordinate system assignments. The drawback is in performance; this command is considerably slower than Export to SQL Server and is best used for smaller datasets (<1000000 rows per table). Existing Standard SQL Server Data If you have databases that currently use GeoMedia's standard SQL Server data server, the best way to migrate them is to use one of the methods discussed in the previous section. You cannot convert a GeoMedia Standard SQL Server dataset directly to the native spatial model at the database level. Feature Class Definition The Feature Class Definition command in GeoMedia Professional works the same as it does with other read-write data servers. You can add tables and columns and edit existing tables and columns as long as the user account you are connected with has the correct permissions. Just remember, if a login that does not have the db_owner assigned creates tables, they will only be accessible to the login that created the tables. For best results, create tables while connected as the database administrator or database owner. When editing tables using Feature Class Definition, the following caveats apply: 40 Never change the primary key column of a table after the table has been created. This could make the table inaccessible by GeoMedia Professional. If you need to do this, use Database Utilities to drop the metadata before altering the table using SQL Server’s own tools. You can re-add the metadata after making the table change. If the table has a spatial index, you will need to drop it before modifying the primary key. Do not change data types on existing columns using Feature Class Definition. If you need to do this, drop the metadata first, make the data type change using SQL Server's Management Studio, and then re-insert the metadata using Database Utilities. Renaming a table can take a long time if the table contains data, and by default, SQL Server will disallow this operation. The rename process creates a copy of the existing table, deletes the original, re-creates the table with a new name, and then populates the data back to the newly named table. If you need this capability, you may need to activate the capability using SQL Server's Management Studio. Copying an existing table will not work due to the way the metadata for the GDO to native geometry relationship is handled. If you need to copy a table, use SQL Server's Management Console. GeoMedia SQL Server Spatial User Guide Working with SQL Server Spatial Undo/Redo If you use the Undo/Redo commands while editing the geometry or attributes associated with tables that contain an identity column, be aware that the numeric sequence is not preserved. Auto-increment identity columns are usually assigned as primary key columns, and they should not be used as part of a foreign key. Failure to heed this warning could invalidate view-join definitions. For example, a row of your data consists of an identity field called ID that contains the value 10, and there are 300 total records in this table such that max(ID)=300. If you accidentally delete this row and use the Undo command to get it back, ID will now be assigned the next available number in the auto-increment sequence, in this case 301. The original ID=10 is not recoverable. In all cases, the next available autonumber value will be obtained on an undo/redo operation; the previous autonumber value will not be preserved. This is actually by design; it is how Microsoft intends the auto-increment field to be used. Default Values Default values can simplify data entry and supply values for columns that are either required or just need to have a specific entry. Default values are honored by GeoMedia but not directly. When inserting a new record with the option to display the Attribute Properties dialog box turned on, the default values are not shown in the dialog box even though they are available at the database level. They will only be used when the insert occurs. If the fields are required, you will not see an error; instead, the insert will pick up the default values. However, if the option Copy attribute values from previous feature is enabled (Placement and Editing tab, Tools > Options dialog box), you will no longer be able to use the default value. Instead, the value used in the previous insert will be used. If you delete the previous value used in a required field, the default value will still not be used, and you will get an error message. For best results with defaults, either turn off the Copy attribute values from previous feature option, or do not make the fields required. Functional-based defaults will work, but again, you must turn off the Copy attribute values from previous feature option. This same problem will occur if you are using triggers to populate required fields. Spatial Filtering Spatial filtering will use the spatial index created on the tables' native geometry columns. performance of spatial indexes can vary widely, so if performance is an issue, consider GeoMedia SQL Server Spatial User Guide The 41 Working with SQL Server Spatial re-creating the spatial indexes using different parameters. different spatial filter options: GeoMedia applications have four Coarse Overlap – This method uses SQL Server's Filter method to return the results. This is generally the fastest performing filter because it only uses the spatial index; however, it will always pick up extraneous values. Overlap – This method uses SQL Server's two pass STIntersects method. Entirely Inside - This method uses SQL Server's STWithin method and then processes the final results on the client. Inside - This method uses SQL Server's STWithin method. Simple rectangular polygons will return the quickest results; the more complicated the filter area, the slower the process. For geographic data, SQL Server only supports Filter and STIntersects. For these cases, GeoMedia will perform the final filtering on the client. Views and Join Views GeoMedia Professional makes no distinction between views and tables; it treats a view just like any other feature class. The SQL Server Spatial data server handles read-write access to most types of views as long as the views are key preserved. This means that the status of the primary key in the base table is preserved in the view. One way to ensure this is true is to include and preserve the primary key in the view definition. In a join-view, the primary key can come from either the left or the right side as long as it retains its key status. It cannot come from both sides of the join and still be updatable. In addition, only the side of the join containing the key will be updatable. For full editing capability on a join view, an instead of trigger is required. For a view to be treated as a spatial feature class, the view definition must include both the native geometry column and GeoMedia's binary GDO column. Metadata is also required to see the view in GeoMedia applications, and Database Utilities can be used to insert the required metadata. For views to be updatable in GeoMedia Professional, there must also be an entry for the key column in the GindexColumns metadata table. This is required for both spatial and non-spatial feature classes that are view based. 42 GeoMedia SQL Server Spatial User Guide Database Utilities Database Utilities Database Utilities consist of several utilities for managing and updating Access, Oracle, and SQL Server databases for use with GeoMedia products. These utilities are delivered with GeoMedia Professional and are accessible from the Start menu. See the Database Utilities online Help for complete information. Database Utilities includes seven separate database tools, but only six of these are available for SQL Server. Here are the six basic tools: You can connect to a SQL Server spatial databases using either Windows domain authentication or SQL Server authentication. For best results, all Database Utilities operations should be performed by a database administrator login or by any user who has been assigned the db_owner role. For new databases, select the Create Metadata Tables command before attempting any other GeoMedia operation. Subsequent use of this command will update existing metadata with the changes for the given release (if any). For tables or views created in SQL Server, use the Insert Feature Class Metadata command to add the metadata required to see these as feature classes in GeoMedia. The primary difference between the SQL Server spatial data server and the standard SQL Server data server is the assignment of the native geometry field and the native SRID value: To alter metadata already entered for existing feature classes, use the Edit Feature Class Metadata command. GeoMedia SQL Server Spatial User Guide 43 Database Utilities 44 To delete the metadata for an existing feature class, use the Delete Feature Class Metadata command. If significant DDL modifications are going to be made to a table or view, the metadata should first be deleted and then re-inserted after the modifications have been made. To assign a default coordinate system to a new database or to re-assign coordinate systems for existing feature classes, use the Assign Coordinate System command. For existing feature classes, this command changes the coordinate system assignment without changing the data. Use discretion here; assigning an incorrect coordinate system can cause problems when editing. Make sure the correct coordinate system is assigned. GeoMedia SQL Server Spatial User Guide Exporting to SQL Server Exporting to SQL Server Use the Export to SQL Server command to export data from a legacy data store to a SQL Server 2008 or later database for use with the GeoMedia product suite. This command is intended for bulk loading large amounts of data into a database by generating ASCII files that can be used by SQL Server’s Bulk Loader application. This command is not intended to be used as an update tool. Before using this command, you must verify that the GeoWorkspace coordinate system is the appropriate target coordinate system for the data you want to export. To use this command, you first select the data to be exported from a treeview of all feature classes/queries, including categories and reference features. You can select any mixture of feature classes, queries, categories, and reference features, across any number of connections. This command offers the following two modes: SQL Server non-Spatial – for SQL Server 2005 or later. varbinary(max). SQL Server Spatial – SQL Server 2008 or later. Geometry storage uses native spatial GEOMETRY/GEOGRAPHY combined with varbinary(max) for unsupported geometry types. Geometry storage uses SQL Server 2000 was de-supported starting from GeoMedia 6.1.11. Only SQL Server 2005 and later version are supported starting from GeoMedia 6.1.11. Native spatial storage is only available in SQL Server 2008 or later. You can write the command output in SQL Server native spatial format for either a projected or non-projected target coordinate system. For a non-projected target coordinate system, you select the appropriate spatial reference system from all the supported spatial reference systems. The export process takes the source data as is with no modification. Source data that is not from another database may have problems once it is imported into the SQL Server spatial environment. Column names may be illegal, primary key columns may not exist, and there may be data issues. After import, verify that the data model conforms to the requirements of SQL Server spatial, and make any necessary corrections before using the data in the GeoMedia environment. You should also make sure that spatial indexes are created on the spatial geometry columns after any import operation. In the Exporting options on the Export to SQL Server dialog box, the Export native spatial format check box is enabled whether the active target coordinate system is projected or non-projected. When this check box is checked and a non-projected target coordinate GeoMedia SQL Server Spatial User Guide 45 Exporting to SQL Server system is active, the Spatial reference system identifier drop-down list is enabled and populated with all supported spatial reference systems, from which you choose the appropriate one. Export to SQL Server creates the following files based on the coordinate system of the GeoWorkspace: Metadata.sql—Creates GeoMedia's required metadata objects. FeatureClassName_pre.sql (one for each feature class or query exported)—Creates the table using defaults. You can also create the table or edit the delivered script file for more control. FeatureClassName.bcp (one for each feature class or query exported)—Data file for loading data. FeatureClassName_post.sql (one for each feature class or query exported)—Populates the SQL Server metadata table and all GeoMedia metadata tables. FeatureClassName.dat—Contains the attribute and geometry data for use with the bulk load processor. Import.bat—Script file with all of the above files, which uses common defaults and can be edited for handling specific options. export.log—Log file that contains either the cause of failure if error conditions arise or the number of features successfully exported per selected feature class during the export process. By default, the data is exported to the \Warehouses folder. You can change this location on the dialog box, and this location is then remembered as a session preference. Error conditions are not reported to you while the Export to SQL Server command is being run. This is to improve performance and to ensure uninterrupted exports of large sets of data. You should review the export.log file at the completion of the export to determine if any errors occurred during the export process. To export data to SQL Server: 1. Connect to the existing warehouse from which you want to export data. 2. Verify that the GeoWorkspace coordinate system is the appropriate target coordinate system for the data that is to be exported. 46 GeoMedia SQL Server Spatial User Guide Exporting to SQL Server 3. Select Warehouse > Export to > SQL Server to open the Export to SQL Server dialog box. 4. Select the appropriate items from the Features to export treeview. Holding the cursor over an entry displays a tooltip with the geometry type of the entry. 5. Optional: Check the Export to native spatial format check box. 6. With the check box in the previous step checked, and using an active non-projected target coordinate system, select the appropriate reference system from the Spatial reference system identifier drop-down list, When you select a spatial reference system identifier for the first time with an active non-projected coordinate system, the following warning message is displayed: Verify that the GeoWorkspace coordinate system is identical to the selected spatial system before proceeding. This warning is also displayed when the default selection is restored from session preferences and you have not changed it. 7. Select the appropriate Export folder. 8. Click Apply to export the data. GeoMedia SQL Server Spatial User Guide 47 Exporting to SQL Server The following error message is displayed when there is no selected spatial reference system identifier for a non-projected active coordinate system, and you click Apply: Select a spatial reference system identifier that matches the GeoWorkspace coordinate system before proceeding. 9. Examine the output ASCII files, and modify them if necessary. 10. Run the output script file. 11. Use Bulk Loader to create SQL Server tables and to load the geometry and attributes to the SQL Server database. 48 GeoMedia SQL Server Spatial User Guide Technical Support and Information Intergraph provides several ways to access information and to contact support, including self-help tools and phone support. Self-Help Support Tools Intergraph provides several electronic self-help support tools to answer your support questions 24 hours a day, 7 days a week. 1. Go to the SG&I Support page (http://support.intergraph.com/). The first time you select this link, it displays the Intergraph Support page, and you need to select Security, Government & Infrastructure Division to display the SG&I Support page. When you select this link the next time, it will go directly to the SG&I Support page. If you later want to change the division, just click (Change Support Division) in the list at the upper left of the SG&I Support page. 2. Under Product Support, select the appropriate Intergraph product from the Products drop-down list; then click Go. 3. On the Customer Log In page, enter your user ID and password; then click Log In. do not have a user login, click the link to request one. If you 4. On the product page, do one of the following: Click Knowledge Base. Scroll to the Product Versions table and click the download icon for the document you want to read. To read about new or enhanced features, click Release Notes. To read about defects that have been fixed, click Issues Resolved. Release Notes and Issues Resolved may not be available for the initial release of a product because an initial release has all new features and no updated features. Some minor releases may not provide Release Notes or Issues Resolved. Phone Numbers For general Intergraph information, please call 1.800.791.3357 (U.S.) or 001.256.730.2000 (international). For worldwide support, please contact your local Intergraph office (http://www.Intergraph.com/worldwide.aspx). For North American Phone Support, please call the appropriate number in the following table: GeoMedia SQL Server Spatial User Guide 49 Technical Support and Information Product Family Phone Numbers Additional Information Utilities and Communication 1.877.463.1217 Monday – Friday 7:00 a.m. – 7:00 p.m., CST FRAMME G/Technology InService Government/Transportation Camera Systems Digital Cartographic Suite GeoMedia GIS Imaging GIPS/GIES ImageStation IntelliWhere MGE TerraShare Public Safety 50 Business Intelligence I/CAD Map Production Products Mobile Products Records Management Suite Security Video Analyst 24/7 support for P1 Critical System Down problems 1.800.661.8134 Monday – Friday 7:00 a.m. – 7:00 p.m., CST 1.877.822.8921 Monday – Friday 7:00 a.m. – 7:00 p.m., CST 24/7 support for P1 Critical System Down problems Federal & Third Party 1.800.633.7248 7:00 a.m. – 7:00 p.m., CST Hardware 1.800.414.8991 Per-call support and spare parts (7:45 a.m. - 4:00 p.m.). Per-call support requires PO or credit card number. GeoMedia SQL Server Spatial User Guide Technical Support and Information Other Links To submit sales inquiries, general questions, and comments, please visit our Contact Us Web page (http://www.intergraph.com/contact/default.aspx). GeoMedia SQL Server Spatial User Guide 51 Index D Data Storage and Type Matching • 7 Database Utilities • 32 Delivery and Connection • 5 E Exporting to SQL Server • 33 G GeoMedia Metadata Requirements • 12 I Introduction • 5 T Technical Support and Information • 37 W Working with SQL Server Spatial • 27 GeoMedia SQL Server Spatial User Guide 53 Additional information on Intergraph Support and Services is available on the Internet. Use a Web browser to connect to Intergraph Online (http://www.intergraph.com). For general Intergraph information, call 1-800-791-3357 (U.S.) or 001-256-730-2000 (international).
Copyright © 2024 DOKUMEN.SITE Inc.