Info request on establishing GRASS Locations/Mapsets

W. Fredrick Limp fred at
Sun Aug 8 21:47:33 EDT 1993

In the following Greg discusses the requirements for a new mapset.  In
4.1 there very likely will be a need for projection information.

I have encountered two areas that I would like to know if others have

1>  In setting up a state plane location GRASS requests entry of
the state plane zone.  There are zone entries in the ARC manual the x manual 
etc.  It appears that the correct zone numbers are (not the ones in the
ARC manual of course) but are the ones listed in the LTPlus manual
Am I correct here?

2.  When running v.proj on older maps that have been setup w/ 
m.setproj I get an error.  If I run m.setproj AGAIN (even though
it tells me that proj info already exists) things go swimmingly for v.proj
Have others encountered this also?
> > We have, so far, run into a basic obstacle on defining the region.  We would
> > greatly appreciate if someone could take the time to briefly outline the 
> > protocol of commands to establish a new Location/Mapset (independent of
> > spearfish/PERMANENT), set the extents and projection of this Mapset, and import
> > data in the form of rasters and site lists that are not in GRASS format.
> > Thank you for any responses and assistance.
> > 
> > Thaddeus J. Bara
> > Research Scientist
> > NOAA/National Climate Data Center
> > Asheville, NC
> > tbara at
> It's rather simple, but certainly not obvious or easy to locate help on.
> To create a new location, simply start up GRASS (I haven't tried this with
> XGRASS, but I expect it must provide for the same).  Enter a unique location
> name and GRASS will ask you if you wish to create this location.  Answering
> yes, you proceed to answer a series of questions that establish the name of
> the location (a string label) and the default region for all mapsets which
> will be created under this location.  The result is that the mapset PERMANENT
> is created under this location with the files MYNAME and DEFAULT_WIND.
> Quoting from the GRASS Programmer's Manual (p. 19):  Each location must have a 
> PERMANENT mapset.  This mapset ... contains ... two special files that are only 
> found in this mapset [per location!].  These files are MYNAME and DEFAULT_WIND...
> MYNAME is a descriptive name for the location.  You will find a template in
> spearfish/PERMANENT.  DEFAULT_WIND is the important one.  It is used to 
> initialize the WIND file when GRASS creates a new mapset, and can be used by
> the user as a reference region at any time.
> p. 50 of the manual details the simple ASCII format of this type of file.  And
> again, you have a template in spearfish.
> When you have finished defining the default region, GRASS returns you to the
> entry point where you may now set a new mapset name as well (I prefer not to
> put any other data in PERMANENT).  This dir is also created by GRASS, and you
> will enter your session with the region set to the default.
> Data import is another matter.  You need to examine man pages for programs
> like,, and application specific utilities such
> as,,  Using these and others, you can begin to
> assemble data in the new location/mapset. 
> greg
> ******************************************************************************
> Greg Koerper                            Internet: greg at
> ManTech Environmental Technology, Inc.  UUCP:     hplabs!hp-pcd!orstcs!koerper
> US EPA Environmental Research Lab
> 200 SW 35th St., JSB                    
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W. Fredrick Limp,   Director                     FAX: (501) 575-3846
CAST, Center for Advanced Spatial Technologies   TEL: (501) 575-6159     
12 Ozark Hall, University of Arkansas         
Fayetteville AR 72701                             fred at 

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