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GRASS 4.1 U.S. Army CERL 2 <br /> g.region <main> GRASS Reference Manual <main> g.region <br /> Each GRASS LOCATION_NAME has a fixed geographic region, <br /> called the default geographic region (stored in the <br /> region file DEFAULT_WIND under the special mapset <br /> PERMANENT), that defines the extent of the data base. <br /> While this provides a starting point for defining new <br /> geographic regions, user-defined geographic regions <br /> need not fall within this geographic region. <br /> Current Region: <br /> Each mapset has a current geographic region. This <br /> region defines the geographic area in which all GRASS <br /> displays and analyses will be done. Data will be <br /> resampled, if necessary, to meet the cell resolutions <br /> of the current geographic region setting. <br /> Region Data Base: <br /> Each GRASS MAPSET may contain any number of pre- <br /> defined, and named, geographic regions. These region <br /> definitions are stored in the user's current mapset <br /> location under the windows directory (also referred to <br /> as the user's data base of region definitions). Any of <br /> these pre-defined geographic regions may be selected, <br /> by name, to become the current geographic region. <br /> Users may also access saved region definitions stored <br /> under other mapsets in the current location, if these <br /> mapsets are included in the user's mapset search path. <br /> REGION EDIT PROMPT <br /> Most of the options will require the user to edit a <br /> geographic region, be it the current geographic region or <br /> one stored in the user's data base of region definitions <br /> (the windows directory). A standard prompt is used to <br /> perform this edit. An example is shown below: <br />Page 16 <br />01/03/97 2.03-02 - Lange <br />