# GRASS Help System

## DEFINING REGIONS FOR TAPE EXTRACTION

The GRASS tape extraction programs import elevation, land use and land cover, satellite imagery, and other data stored on magnetic tape into a GRASS database. These programs use the user's current geographic region settings for data extraction. The user is urged to check the boundaries and resolution of the current region setting BEFORE extracting data, since GRASS tape extraction programs will only extract the data that fall within these boundaries and use only the set cell resolution during extraction. These settings can be modified with the g.region command.

The m.tiger.region command can be used to extract region definitions needed to extract Census Bureau TIGER data.

For more information about modifying the geographic boundaries and data resolution when extracting data from magnetic tape, select "Management of Geographic Regions" from this area's menu.

For more information on GRASS tape extraction programs, select the topic area "Extracting Data from Magnetic Tapes," located at the Help System Main Menu.

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Automatically created on: Thu Oct 13 02:16:43 2005