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1:24,000 Scale DRG
(Eastford, CT)

1:250,000 Scale DRG
(Hartford, CT)

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Product Description

A Digital Raster Graphic (DRG) is a scanned image of a USGS standard series topographic map, including all map collar information. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Universal Transverse Mercator (UTM) projection. The horizontal positional accuracy and datum of the DRG matches the accuracy and datum of the source map. The map is scanned at a minimum resolution of 250 dots per inch.

DRGs have been made for all quadrangles in the USGS standard topographic map series for the United States, its territories and trusts. Source maps include:

• 7.5-minute maps of the conterminous United States, Hawaii, and limited areas of Alaska at 1:24,000- and 1:25,000-scale.
• 7.5 x 15-minute maps in limited areas of the conterminous United States at 1:25,000-scale.
• Pacific Island maps at 1:20,000-, 1:24,000-, and 1:25,000-scales.
• Puerto Rico and the Virgin Islands at 1:20,000-scale.
• Culebra, its adjacent islands, and the Island of Vieques at 1:30,000-scale.
• Alaska at 1:63,360-scale.
• 30 x 60-minute maps of the conterminous United States at 1:100,000-scale.
• 1 x 2-degree maps of the United States at 1:250,000-scale.

Because of cooperative agreements with other agencies, the USGS does not make or sell DRGs for the following areas:

• 1:24,000-scale DRGs over California. See the California Spatial Information Library for product and ordering information.
• DRGs for parts of Tennessee and some neighboring states are made by the Tennessee Valley Authority (TVA). See the TVA web site for product and ordering information.

See the DRG status graphic for approximate areas of coverage. The technical specifications for DRGs from these sources differ slightly from USGS specifications.

DRGs are in TIFF 6.0 and use GeoTIFF 0.2 specifications to define a set of TIFF tags. These tags describe all cartographic information associated with the file. The average file size is 10 megabytes. DRGs are distributed via File Transfer Protocol (FTP).

Current DRGs are also available as a seamless product and can be downloaded free of charge from Seamless. The DRGs are collarless and available for most of the conterminous U.S.

Additional Information:

• DRG Homepage
• DRG Fact Sheet 
• DRG Abstract

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Prices

• Handling Charge:$5.00
• International Shipping
• Product Return Policy
• Delivery Times

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Search & Order

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Sample Data

A sample 1:24,000-Scale DRG can be downloaded from USGS Geographic Data Download.

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U.S. Department of the Interior | U.S. Geological Survey
URL: http://eros.usgs.gov/
Page Contact Information: custserv@usgs.gov
Page Last Modified: August 22, 2006