Name
Spatial Data Transfer Standard Files (SDTS)
Synopsis
This is a U.S. Geological Survey (USGS) format. SDTS has a raster and a vector format. The raster format isn't supported in MapServer; only the vector formats are supported, including VTP and DLG files.
File listing
SDTS files are often organized into state-sized pieces; for example, all pf the state of Maryland, U.S.A.
Files are also available for multiple types of features including hydrography, transportation, and administrative boundaries.
This example uses transportation data, which consists of 35 separate files, each with the suffix DDF.
MDTRAHDR.DDF MDTRARRF.DDF MDTRCATS.DDF
MDTRDQCG.DDF MDTRFF01.DDF MDTRLE02.DDF
MDTRNA03.DDF MDTRNO03.DDF MDTRSPDM.DDF
MDTRAMTF.DDF MDTRBFPS.DDF MDTRCATX.DDF
MDTRDQHL.DDF MDTRIDEN.DDF MDTRLE03.DDF
MDTRNE03.DDF MDTRPC01.DDF MDTRSTAT.DDF
MDTRARDF.DDF MDTRBMTA.DDF MDTRDDSH.DDF
MDTRDQLC.DDF MDTRIREF.DDF MDTRNA01.DDF
MDTRNO01.DDF MDTRPC02.DDF MDTRXREF.DDF
MDTRARDM.DDF MDTRCATD.DDF MDTRDQAA.DDF
MDTRDQPA.DDF MDTRLE01.DDF MDTRNA02.DDF
MDTRNO02.DDF MDTRPC03.DDFData access/connection method
SDTS access is available in MapServer through OGR.
The
CONNECTIONTYPE OGRparameter must be used.The path to the catalog file (????CATD.DDF) is required, including file extension.
There are multiple layers in the SDTS catalog, some of which are only attributes and have no geometries.
ogrinfo examples
Here's an example that uses ogrinfo on a catalog file (note that the
first seven layers don't have geometries):
>ogrinfo ...