[GRASS-user] Switching locations on-the-fly

[Bartolomei.Chris]

Hi Rich - Here's a generic version of what I did (I'm not the best programmer, but this worked):

# this is necessary because the environments change in this script
GISDBASE="D:/GRASSDATA/"   # use your info!
LOCATION_NAME_1="latlon"   # use your info!
LOCATION_NAME_2="UTM_23"   # use your info!
MAPSET_1="user_latlon_maps"   # use your info!
MAPSET_2="user_UTM23_maps"   # use your info!
HISTFILE_1="$GISDBASE/$LOCATION_NAME_1/$MAPSET_1"/.bash_history
HISTFILE_2="$GISDBASE/$LOCATION_NAME_2/$MAPSET_2"/.bash_history
history -w
history -r "$HISTFILE_1”
# make sure mapsets in the location are available to change into (this is a user control)
# you can change mapsets within the location easily but changing locations requires
# resetting the history file
g.mapsets mapset=$VMAP_MAPSET,$ MAPSET_1,$SUB_MAPSET,$CLIM_MAPSET operation=set
                # set your mapset (in the current location)
g.mapset mapset=$MAPSET_1 location=$LOCATION_NAME_1 dbase=$GISDBASE
# set your region!
g.region -a vector=SomeMap@$MAPSET_1
                # do your GRASS thing
…
                # now change your location and mapset
history -w
history -r "$HISTFILE_2”
                # if you need more than one mapset in this location, make them available to the user:
g.mapsets mapset=$MAPSET_2,$MAPSET_X,$MAPSET_Y operation=set
g.mapset mapset=$MAPSET_2 location=$LOCATION_NAME_2 dbase=$GISDBASE
# set your region!
g.region -a vector=SomeMap@$MAPSET_2
                # do your GRASS thing
…
# reset the mapset and counters
history -w
history -r "$HISTFILE_1”
g.mapset mapset=$MAPSET_1 location=$LOCATION_NAME_1 dbase=$GISDBASE
# reset your region!
g.region -a vector=SomeMap@$MAPSET_1



I hope this helps you

[😊]

Chris


Chris Bartolomei P.E.
bartolomei.chris at ensco.com
________________________________
From: grass-user <grass-user-bounces at lists.osgeo.org> on behalf of Markus Metz <markus.metz.giswork at gmail.com>
Sent: Wednesday, November 1, 2017 12:38:07 AM
To: Rich Shepard
Cc: grass-user at lists.osgeo.org
Subject: Re: [GRASS-user] Switching locations on-the-fly



On Wed, Nov 1, 2017 at 12:21 AM, Rich Shepard <rshepard at appl-ecosys.com<mailto:rshepard at appl-ecosys.com>> wrote:
>
> On Tue, 31 Oct 2017, Bartolomei.Chris wrote:
>
>> are you using the gui or in a bash shell?
>
>
> Chris,
>
>   Both. I'll use the GUI when reprojecting because it's less typing than the
> whole path name to the source. Most often I use the shell (bash).
>
>> In the gui, go to Settings, GRASS working environment, Change location and mapset
>
>
>   Good to know. I've not explored all the GUI menus.
>
>> That will change it all on the fly. You can do this in a batch script as
>> well but it's a little tricky - your .bash_history changes with changed
>> locations and you need to reset your GISDBASE, MAPSET, and LOCATION
>> internal GRASS variables, etc. Let me know if you want those steps and
>> I'll dig them out of an old script I have.
>
>
>   When you can, please share them with me.

You can use g.mapset to switch locations (also GRASS databases) on the fly. With g.mapset, the .bash_history of the initial location will be used to record command history.

Markus M
>
> Much appreciated,
>
> Rich
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