Format USGS Digital Line Graph, Spatial Data Transfer Standard 

SDTS Description: Spatial Data Transfer Standard or SDTS, supported by our 3D GIS mapping software Global Mapper, defines data as an non-proprietary format for packaging vector or raster spatial data. Designed to enable blind transfer of information between different hardware and software applications.

SDTS was designed by an committee for a variety of government agencies and private companies requiring a more efficient procedure for exchanging GIS data. 

The USGS department of The National Mapping Division is now responsible for the maintenance of the SDTS standard.

SDTS is not classified as a software package, database, product specification or intended to replace gis mapping software internal processing structures.

Spatial content is equivalent to DLG-O, but physical format and metadata content are more robust. Scales are 1:24,000/25,000, 1:100,000 and 1:2,000,000. 

DLG/SDTS data are derived directly from DLG-O data, which continue to be produced 
and sold as before.

Available for free? Yes.

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