# GRASS Help System

## USGS 1-DEGREE DEM DATA

The U.S. Geological Survey distributes 1-degree and 7.5-minute digital elevation models (DEMs). 1-degree DEMs have a resolution of 100 meters, while 7.5-minute DEMs have a resolution of 30 meters.

Characteristics of 1-Degree DEM:

* The actual elevation data for this product is produced by the
Defense Mapping Agency, but is distributed by the USGS in a
different tape format. See description of DMA DTED-1 data for
specific information on this product.

* Product is distributed in 1-degree x 1-degree blocks.
Each block corresponds to the east or west half of a standard
USGS 1:250,000 scale map series quadrangle.

* Only the contiguous United States, Hawaii, and limited portions
of Alaska are distributed.

* Price is $75.00 for each 1-degree x 1-degree block.

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Automatically created on: Wed Oct 12 14:08:40 2005