SDTS (*catd.ddf;*iden.ddf)

SDTS (Spatial Data Transfer Standard) is a United States Federal Information Processing Standard (FIPS 173) for the non-proprietary, vendor neutral distribution of geospatial data and for the exchange of geospatial data between dissimilar digital geographic information systems.

SIS Desktop reads SDTS Digital Line Graph (DLG-3) Topological Vector Profiles (TVP).


  • Cadcorp SIS Desktop
  • Cadcorp SIS Desktop Express
  • Cadcorp SIS ActiveX Modeller
  • Cadcorp SIS ActiveX Manager
  • Cadcorp SIS ActiveX Viewer
  • Cadcorp GeognoSIS