U.S. Fish & Wildlife Service
Data Layer: DIGITAL RASTER GRAPHIC
You are invited to read the definitions of terms used in this data standard.
| Name |
Digital Raster Graphic (DRG) |
| Description |
Digital maps created by the U.S. Geological Survey (USGS). These are scanned, georeferenced copies of the USGS topographic maps. They are available in the standard topographic map scales and are in a GeoTIFF format. |
| Source |
USGS
EROS Data Center - DRGs are listed under Map products. USGS Geospatial Data - DRGs Available Online |
| Historical Data | Earlier versions of the data standard are available here: Digital Raster Graphic |
| Reference(s) |
Part 270, FW 6, Data Management and Standards, dated September 30, 2002. Digital Raster
Graphics (DRG) - product description, prices, sample data, search
and order DRG data. DRG Program Overview - history, description, georeferencing information, updates and product maintenance, and DRGs from non-USGS sources. DRG Fact Sheet - General information on DRGs; very readable. |
| Use Instructions |
The USGS DRGs are automated to strict standards. They are used frequently
as a locational backdrop, but also as a source for on-screen digitizing and updating
existing files. Any DRGs used by Service personnel should either be obtained from the USGS
or, at a minimum, have been scanned to meet USGS standards. Tools for utilizing these
data, converting the data to formats used by different GIS systems, and evaluating the
accuracy of DRGs created by offices other than the USGS are listed below. The DRG files obtained from the USGS, rather than a re-seller, are generally in the UTM coordinate system. |
| Tools |
The USGS DRGs can be viewed with a variety of commercial software packages, as well as with a free USGS viewer, at http://statgraph.cr.usgs.gov/viewer.htm |
| Phase |
Adopted |
| Approval Date |
March 21, 2000 |
| Validation Date |
January 25, 2005 |
| Data Steward |
Deb Southworth Green, National FWS GIS Coordinator, Branch of Data and System Services, Division of Information Resources and Technology Management |
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These pages are maintained by the U.S. Fish and Wildlife Service, Division of Information Resources and Technology Management. Please feel free to contact Deb Southworth Green with any questions and comments.
Keywords=fish, wildlife, animals, birds, data, standards, layers,
DRG, digital, raster, graphic
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