# GRASS Help System

mapset - A directory in which GRASS database elements are stored. At the start of each GRASS session, the user must specify a current mapset ($MAPSET), current location ($LOCATION_NAME), and current database ($GISDBASE). Any maps created or modified by the user in the current GRASS session will be stored in the user's current mapset. The user may also access data stored in other mapsets under the same GRASS location as the current mapset. All mapsets stored under the same location directory refer to the same general geographic region, and must use the same map coordinate system.

A special mapset (named 'PERMANENT') is stored under each location directory; it contains some files used by all mapsets under that location (e.g., those specifying a default geographic region, the name of the geographic location, the location's map coordinate system, etc.), and commonly also contains standard maps needed by many applications.

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Automatically created on: Sat Jan 8 06:50:28 2005