[GRASS-user] Getting Started with GRASS Python Scripts
nik at nikosalexandris.net
Thu May 23 17:14:07 PDT 2013
Martin Lacayo wrote:
> I think I have now figured out most of the answers to my question, but
> I am still wondering about some file management.
If I may chime in, I repeat what Richard already explained actually, just for
The GRASS GIS data base is the root (of all good geospatial analyses :D).
Inside it are put Locations. There can be only one reference system per
Location. And, inside a Location, Mapsets help to organise stuff. Note, there
is always a PERMANENT Mapset per Location and users may/should use it as a
pool for imported data from which to draw the material that is to be
> Is the following command a "normal" way to make a location with a
> projection from a georeferenced file:
> g.proj -c georef=/home/user/raster.tif location=example
1) be careful to define a "location=" otherwise the current location will be
2) only from inside an existing GRASS Location! From outside, you may use
something like the following
grass70 -c /geo/geodata/SomePointOfInterest.kml
In this example, the georeferenced file "SomePointOfInterest.kml" will be used
obtain information about the spatial reference system and a Location will be
created. Actually, any georeferenced file recognised by GDAL/OGR should be a
Depending on how many of the directories given in the path pre-exist, a Mapset
will be created (if GISDBASE and LOCATION pre-exist), a LOCATION will be
created as the last part of the defined path (if only the GISDBASE pre-
Please, check also the output of 'grass --help' if working in the command line
(because the word "Scripts" is mentioned in the subject of this thread).
> Is there a command to delete a location?
No. One has/can simply delete it as any other directory.
> I found g.mremove, but that seems to remove data, not locations.
Yes, "g.remove" is for removing single elements inside a GRASS GIS data base
(raster and vector maps, groups of raster maps and other). "g.mremove" (note
"_m_remove" instead of simply "remove") is for removing multiple elements/maps
in one go by defining a naming pattern using regular expressions.
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