DRG : Digital Raster Graphic Data / U.S. Geological Survey.

Other author Geological Survey (U.S.)
Format Software
EditionEd. 1.
Publication Info[Reston, Va.] : [The Survey], [1996-]
Descriptioncomputer laser optical discs ; 4 3/4 in.
Subjects
Digital mapping--Databases.
Topographic maps--Databases.
Cartography--Automation. --Databases.
United States--Maps, Topographic. --Databases.

Portion of title Digital Raster Graphic Data
Cartographic dataScale differ.
Abstract "Digital Raster Graphic (DRG) images of USGS standard series quadrangles cover systematically subdivided areas of latitude with formats ranging from 7.5- by 7.5-minutes to 1- by 2-degrees. DRG's of standard quadrangles range in scale from 1:20,000 to 1:250,000. DRG's coverages include the conterminous United States, Alaska, Hawaii, Puerto Rico and the Virgin Islands"--DRGP̲KG. TXT file.
General noteTitle from disc label.
General note"Mastered 1/96-<7/96>
General noteText files in ASCII format.
General note"TIFF PackBits compressed."
General noteEach CD-ROM includes the USGS topographic maps for a 1-degree cell.
Technical detailsSystem requirements: IBM compatible PC with 80386 or higher; Microsoft Windows 3.1; Microsoft compatible pointing device (mouse); 16 MB of hard drive space; 4 MB of RAM (8 MB recommended); CD-ROM reader.
Technical detailsDisk characteristics: CD-ROM.
Govt. docs number I 19.128:

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