----------------------------Original message----------------------------
   I haven't seen anything about the DRG survey on MAPS-L, and the deadline
for selection is August 4, 1995, so here's some information about it.  This
message will primarily be of interest to depository libraries and more
generally to users of USGS topographic maps.  Libraries participating in the
Federal Depository Library program are currently being surveyed for selection
of USGS-produced Digital Raster Graphics (DGR) on CD-ROM.  You may want to
talk with your local depository librarian about these to find out about
whether DRGs will be available locally or regionally.
 
   The survey states:
 
This survey offers the Digital Raster Graphics (DRG) for depository
distribution.  A (DGR) is a scanned image of a U.S. Geological Survey (USGS)
topographic map.  The scanned image includes all map collar information.  The
image inside the map neatline is georeferenced to the surface of the Earth.
The DRG can be used to collect, review, and revise other digital data,
especially digital line graphs (DLG).  The DRG can be combined with other
digital products, such as the digital orthophotoquadrangles (DOQ) or the
digital elevation models (DEM) to provide additional visual information.  The
USGS plans to produce DRGs of the 1:24,000, 1:100,000, and 1:250,000 scale
topographic map series beginning with the 1:24,000 scale 7.5 minute
quadrangles.  Additional information can be obtained on the World Wide Web at
http://mcmcweb.cr.usgs.gov/
 
The CDs will contain the necessary software to run the discs.  The complete
set of 7.5' 1:24,000 scale maps is expected to consist of approximately 900
CDs.
 
Libraries must respond to the survey by August 4, 1995 to be eligible to
receive DRGs in Fiscal Year 1996.
 
John Stevenson
University of Delaware Library
Government Documents and Maps
Newark, DE  19717-5267
 
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