File listing

Spatial Data Transfer Standard Files (SDTS)

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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.

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.DDF 

Data access/connection method

• SDTS access is available in MapServer through OGR.

• The CONNECTIONTYPE OGR parameter 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 /data/sdts/MD/MDTRCATD.DDF      Had to open data source read-only.     INFO: Open of 'MDTRCATD.DDF'     using driver 'SDTS' successful.     1: ARDF (None)     2: ARRF (None)     3: AMTF (None)     4: ARDM (None)     5: BFPS (None)     6: BMTA (None)           7: AHDR (None)     8: NE03 (Point)     9: NA01 (Point)     10: NA02 (Point)     11: NA03 (Point)     12: NO01 (Point)     13: NO02 (Point)     14: NO03 (Point)     15: LE01 (Line String)     16: LE02 (Line String)     17: LE03 (Line String)     18: PC01 (Polygon)     19: PC02 (Polygon)     20: PC03 (Polygon) 

Here's an example that uses ogrinfo to examine the structure of the file/layer:

     > ogrinfo -summary /data/sdts/MD/MDTRCATD.DDF LE01     Had to open data source read-only.     INFO: Open of 'MDTRCATD.DDF'     using driver 'SDTS' successful.           Layer name: LE01     Geometry: Line String     Feature Count: 780     Extent: (-80.000289, 36.999774) - (-74.999711, 40.000225)     Layer SRS WKT:     GEOGCS["NAD27",         DATUM["North_American_Datum_1927",             SPHEROID["Clarke 1866",6378206.4,294.978698213901]],         PRIMEM["Greenwich",0],         UNIT["degree",0.0174532925199433]]     RCID: Integer (0.0)     SNID: Integer (0.0)     ENID: Integer (0.0)     ENTITY_LABEL: String (7.0)     ARBITRARY_EXT: String (1.0)     RELATION_TO_GROUND: String (1.0)     VERTICAL_RELATION: String (1.0)     OPERATIONAL_STATUS: String (1.0)     ACCESS_RESTRICTION: String (1.0)     OLD_RAILROAD_GRADE: String (1.0)     WITH_RAILROAD: String (1.0)     COVERED: String (1.0)     HISTORICAL: String (1.0)     LIMITED_ACCESS: String (1.0)     PHOTOREVISED: String (1.0)     LANES: Integer (2.0)     ROAD_WIDTH: Integer (3.0)     BEST_ESTIMATE: String (1.0)     ROUTE_NUMBER: String (7.0)     ROUTE_TYPE: String (9.0) 

Map file example

     LAYER       NAME sdts_maryland       TYPE LINE       CONNECTIONTYPE OGR       CONNECTION "data/sdts/MD/MDTRCATD.DDF,14"       STATUS DEFAULT       CLASS         COLOR 0 0 0       END     END