This file is very likely an ESRI Personal Geodatabase that, in ArcGIS 8 and 9 was build on top of MS Access mdb files. Beginning on Arc 9 (I believed), ESRI came up with a new geodatabase format called File Geodatabase, that is kept as a directory structure in your harddrive.
Anyway, it appears as thou OGR driver can read Personal Geodatabases but you need to set up an ODBC driver and some other things. I've never done this myself so I don't know if it works. Check the PGeo instruction on OGR. http://www.gdal.org/ogr/drv_pgeo.html Cheers and good luck Daniel On Tue, Jan 11, 2011 at 8:05 PM, John C. Tull <[email protected]> wrote: > On Jan 11, 2011, at 1:54 PM, Rich Shepard wrote: > >> On Tue, 11 Jan 2011, John C. Tull wrote: >> >>> Did it preserve spatial topology for you? I was able to successfully >>> convert an mdb to sqlite, but it does not have any geographic reference. >>> This is fine for extracting data tables, but seems to sacrifice the value >>> of a spatial database, unless there are fields representing coordinates >>> for each table row. >> >> John, >> >> I've no idea. I'm only unzipping BLM data files now. I assume that Access >> has no topology as it's a flatfile database that could be used as a front >> end to SQL-Server. >> >> The file I have is for land status (i.e., ownership) and the SQLite tables >> are: >> >> sqlite> .tab >> GDB_AnnoSymbols GDB_GeomColumns GDB_ReplicasEx GDB_AttrRules >> GDB_JnConnRules GDB_SpatialRefs GDB_CodedDomains >> GDB_ObjectClasses GDB_Subtypes GDB_DefaultValues GDB_RangeDomains >> GDB_Toolboxes GDB_Domains GDB_RasterCatalogs >> GDB_TopoClasses GDB_EdgeConnRules GDB_RelClasses GDB_TopoRules >> GDB_ExtensionDatasets GDB_RelRules GDB_Topologies GDB_Extensions >> GDB_ReleaseInfo GDB_UserMetadata GDB_FeatureClasses >> GDB_ReplicaDatasets GDB_ValidRules GDB_FeatureDataset GDB_ReplicaLog >> Ownership GDB_FieldInfo GDB_Replicas >> Ownership_Shape_Index >> >> I've no idea what the GDB_ prefix is supposed to mean. The Bureau >> apparently does not have these data on their ESRI GIS or we'd see .shp or >> .e00 files rather than .mdb files. >> >> Rich > > Hi Rich, > > Actually, your file is a topological database. I work with this information > from the BLM in Nevada regularly. On the Nevada GIS website, they have some > of their files in both .mdb and shapefile. I go to the shapefiles because of > the very issue you are encountering with a closed file format. Your land > status columns are different than the Nevada specific ones, but this > particular file is meant to represent the managing agency or ownership status > of lands for the area covered. I'm not sure what value the database has > without the topology. > > Here is the link to the Nevada BLM GIS webpage: > http://www.blm.gov/nv/st/en/prog/more_programs/geographic_sciences/gis/geospatial_data.html > > Regards, > John > > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
