Provided by: grass-doc_8.4.0-1_all 
NAME
g.mapsets - Modifies/prints the user’s current mapset search path.
Affects the user’s access to data existing under the other mapsets in the current project.
KEYWORDS
general, settings, search path
SYNOPSIS
g.mapsets
g.mapsets --help
g.mapsets [-lps] mapset=name[,name,...] operation=string format=name
[separator=character] [--help] [--verbose] [--quiet] [--ui]
Flags:
-l
List all available mapsets in alphabetical order
-p
Print mapsets in current search path
-s
Launch mapset selection GUI dialog
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--ui
Force launching GUI dialog
Parameters:
mapset=name[,name,...] [required]
Name of mapset (default: current search path)
Name(s) of existing mapset(s) to add/remove or set
operation=string [required]
Operation to be performed
Options: set, add, remove
Default: add
format=name [required]
Output format
Options: plain, json
Default: plain
plain: Plain text output
json: JSON (JavaScript Object Notation)
separator=character
Field separator
Special characters: pipe, comma, space, tab, newline
DESCRIPTION
For basic information about GRASS mapset, project and data base refer to GRASS Quickstart.
A mapset holds a distinct set of data layers, each relevant to the same (or a subset of
the same) geographic region, and each drawn in the same map coordinate system. At the
outset of every GRASS session, the user identifies a GRASS data base, project (previosuly
called location), and mapset that are to be the user’s current data base, current project,
and current mapset for the duration of the session; any maps created by the user during
the session will be stored under the current mapset set at the session’s outset (see
g.mapset [without an "s"] and g.gisenv for changing the mapset with a session).
The user can add, modify, and delete data layers that exist under their current mapset.
Although the user can also access (i.e., use) data that are stored under other mapsets in
the same GRASS project using the mapname@mapsetname notation or mapset search path, the
user can only make permanent changes (create or modify data) located in the current
mapset. The user’s mapset search path lists the order in which other mapsets in the same
GRASS project can be searched and their data accessed by the user. The user can modify the
listing and order in which these mapsets are accessed by modifying the mapset search path;
this can be done using the g.mapsets command. This program allows the user to use other’s
relevant map data without altering the original data layer, and without taking up disk
space with a copy of the original map. The mapname@mapsetname notation may be used
irrespective of the mapset search path, i.e., any map found in another mapset with
sufficient g.access privileges may be called in such a manner.
g.mapsets shows the user available mapsets under the current GRASS project, lists mapsets
to which the user currently has access, and lists the order in which accessible mapsets
will be accessed by GRASS programs searching for data files. The user is then given the
opportunity to add or delete mapset names from the search path, or modify the order in
which mapsets will be accessed.
When the user specifies the name of a data base element file (e.g., a particular vector
map, raster map, imagery group file, etc.) to a GRASS program, the program searches for
the named file under each of the mapsets listed in the user’s mapset search path in the
order listed there until the program finds a file of the given name. Users can also
specify a file by its mapset, to make explicit the mapset from which the file is to be
drawn; e.g., the command:
g.copy raster=soils@PERMANENT,my_soils
ensures that a new file named my_soils is to be a copy of the file soils from the mapset
PERMANENT.
In each project there is the special mapset PERMANENT included in the mapset search path,
as this mapset typically contains base maps relevant to many applications. Often, other
mapsets which contain sets of interpreted maps will be likewise included in the user’s
mapset search path. Suppose, for example, that the mapset Soil_Maps contains interpreted
soils map layers to which the user wants access. The mapset Soil_Maps should then be
included in the user’s search path variable.
The mapset search path is saved as part of the current mapset. When the user works with
that mapset in subsequent GRASS sessions, the previously saved mapset search path will be
used (and will continue to be used until it is modified by the user with g.mapsets).
NOTES
By default g.mapsets adds to the current mapset search path mapsets named by mapset
option. Alternatively mapsets can be removed (operation=remove) from the search path or
defined by operation=set.
Users can restrict others’ access to their mapset files through use of g.access. Mapsets
to which access is restricted can still be listed in another’s mapset search path;
however, access to these mapsets will remain restricted.
EXAMPLES
Selecting mapsets with the graphical mapset manager
Using the -s flag, a convenient graphical mapset manager can be opened to select and
deselect other mapsets (the actual mapset and the PERMANENT mapset are always selected):
g.mapsets -s
Print available mapsets
All available mapsets in the current project can be printed out by
g.mapsets -l
Available mapsets:
PERMANENT user1 user2
Mapsets can be also printed out as json by setting the format option to "json"
(format="json").
g.mapsets format="json" -l
{
"mapsets": [
"PERMANENT",
"user1",
"user2"
]
}
Add new mapset
Add mapset ’user2’ to the current mapset search path
g.mapsets mapset=user2 operation=add
The current mapset search path is changed accordingly
g.mapsets -p
Accessible mapsets:
user1 user2
Overwrite current search path
Overwrite current search path
g.mapsets mapset=user1,PERMANENT operation=set
Using shortcuts for search path
The current mapset can be defined by a shortcut "." (dot)
g.mapsets mapset=.,PERMANENT operation=set
Note: The current mapset will be always included in the search path on the first position
even if you change its position or omit the current mapset from the mapset option.
g.mapsets -p
Accessible mapsets:
user1 PERMANENT
SEE ALSO
g.access, g.copy, g.gisenv, g.list, g.mapset
AUTHORS
Michael Shapiro, U.S.Army Construction Engineering Research Laboratory
Greg Koerper, ManTech Environmental Technology, Inc.
Updated to GRASS 7 by Martin Landa, Czech Technical University in Prague, Czech Republic
SOURCE CODE
Available at: g.mapsets source code (history)
Accessed: Thursday Aug 01 11:29:44 2024
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