Type: Vector
    Extension: dlg
      Version: 
  Compression:
  Color Depth:
   Maintainer: U.S. Geological Survey (USGS)
Specification:

DLG is used by USGS to store geographical data. Documentation on this
format is available at:

  ftp://spectrum.xerox.com/depts/markc/demtools/demwork/dlg/doc/>.

The format of DLG graph files is described in the publications:

  Data Users Guide 1 - Digital Line Graphs from 1:24,000-Scale Maps
  Data Users Guide 2 - Digital Line Graphs from 1:100,000-Scale Maps
  Data Users Guide 3 - Digital Line Graphs from 1:2,000,000-Scale Maps

and each is available for $2.00 US from:

  Earth Science Information Center (ESIC)
  U. S. Geological Survey
  507 National Center
  Reston, VA  22092 USA
  Voice: 1.800.USA.MAPS
  Voice: 703.860.645

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