Information Resources and Technology Management


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 - DOQs are available for download from USGS Earth Explorer.

The National Map - DRGs Available Online.
Historical Data For information on past versions of this standard, contact the National Data Administrator, Geospatial and Data Services, Division of Information Resources and Technology Management
Reference(s)

Part 270, FW 6, Data Management and Standards, has been superceded by Part 274, FW 2, Establishing Service Data Standards.

Digital Raster Graphics (DRG) - DOQs are available for download from USGS Earth Explorer.

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://earthexplorer.usgs.gov/ and http://nationalmap.gov/viewer.html
Phase
Adopted
Approval Date
March 21, 2000
Validation Date
November 29, 2013
Data Steward
Chris Lett, National FWS GIS Coordinator, Geospatial and Data Services, Division of Information Resources and Technology Management.

 


Last updated: August 12, 2014