# GRASS Help System

## CREATING SUPPORT FILES FOR GRASS MAPS

A variety of supporting information is needed for each GRASS map layer. For data stored in GRASS vector format, information on the location of vectors, the file topology, vector category values, and category labels are stored in separate files. For data stored in GRASS raster format, additional files are also stored to hold information on category colors, the map's development history, etc. The programs below help the user build necessary GRASS support files for raster and vector data. Prefixes indicate whether command create support files for raster ("r.") or for vector ("v.") data.

- r.support - v.support

For more information on a specific command, select a command and press ESC.

Many GRASS commands automatically generate necessary support files. Refer to specific GRASS program manual entries to learn when the user must explicitly create support files.

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Automatically created on: Mon Apr 4 09:21:46 2005