# GRASS Help System

## DTED ELEVATION DATA DISTRIBUTED BY DMA

The Defense Mapping Agency (DMA) produces Digital Terrain Elevation Data levels 1 and 2 ("DTED-1", and "DTED-2"). Although both the DMA and the USGS distribute these data, each distributes it in a different tape format. DTED data obtained from the DMA is extracted using the GRASS program m.dted.extract. DTED data obtained from the USGS is extracted using the program m.dmaUSGSread. Determine the distribution source of your DTED data before you begin the tape extraction process.

DTED-1 has a resolution of roughly 100 meters, while DTED-2 has a resolution of roughly 30 meters. The resolution is the amount of space between each sample elevation point in the data file.

See: Characteristics of DMA's DTED-1 Data

Characteristics of DMA's DTED-2 Data
DTED Production Methods
DTED Distribution

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