ESRI File Geodatabase¶
ESRI File Geodatabases exist in a file folder and offer improved performance and size limitations. For more information see the ESRI description page.
Only file geodatabases created by AcrGIS 10.0 and above can be read by GDAL/MapServer.
File geodatabases are made up of a set of files within a folder. The files are made up of geographic data, attribute data, index files, and lock files. A better description of the file contents can be found here.
Data Access / Connection Method¶
File geodatabase access is available through OGR. See the OGR driver page for FileGDB for specific driver information. The driver is available for GDAL >= 1.9.0. You may also see the the OGR driver page for OpenFileGDB which provides read-only access and does not require an external SDK to compile.
For Windows users, MS4W leverages the OpenFileGDB driver.
The CONNECTION parameter must be used to point to the name of the file folder, and the DATA parameter should be the name of the spatial table (or OGR layer).
CONNECTIONTYPE ogr CONNECTION "filegdb-folder" DATA "layername"
The CONNECTION path is relative to the mapfile (SHAPEPATH is not used here). Full paths can also be used.
First you should make sure that your GDAL/OGR build contains the file geodatabase «FileGDB» driver (or the «OpenFileGDB» driver), by using the „–formats“ command:
>ogrinfo --formats Supported Formats: ... "FileGDB" (read/write) "ESRI Shapefile" (read/write) "MapInfo File" (read/write) "UK .NTF" (readonly) "SDTS" (readonly) "TIGER" (read/write) ...
If you don’t have the driver, see GDAL’s BuildHints page for compiling the driver.
Once you have the FileGDB driver you are ready to try an ogrinfo command on your database to get a list of spatial tables. In the example below our folder is named us_states.gdb:
ogrinfo us_states.gdb INFO: Open of `us_states.gdb' using driver `FileGDB' successful. 1: statesp020 (Multi Polygon)
Now use ogrinfo to get information on the structure of the statesp020 table:
ogrinfo us_states.gdb statesp020 -summary INFO: Open of `us_states.gdb' using driver `FileGDB' successful. Layer name: statesp020 Geometry: Multi Polygon Feature Count: 2895 Extent: (-179.000000, 17.000000) - (179.000000, 71.000000) Layer SRS WKT: GEOGCS["GCS_North_American_1983", DATUM["North_American_Datum_1983", SPHEROID["GRS_1980",6378137.0,298.257222101]], PRIMEM["Greenwich",0.0], UNIT["Degree",0.017453292519943295]] FID Column = OBJECTID Geometry Column = SHAPE AREA: Real (0.0) PERIMETER: Real (0.0) STATESP020: Real (0.0) STATE: String (0.0) STATE_FIPS: String (0.0)
LAYER NAME "fgdb_poly" TYPE POLYGON STATUS ON CONNECTIONTYPE OGR CONNECTION "../data/filegdb/us_states.gdb" DATA "statesp020" PROCESSING "CLOSE_CONNECTION=DEFER" # for maximum performance LABELITEM "STATE" CLASS NAME "US States" STYLE COLOR 120 120 120 OUTLINECOLOR 0 0 0 END LABEL COLOR 255 255 255 OUTLINECOLOR 0 0 0 END END END