[GRASS-user] were is grass looking for the input tif - r.viewshed run from bash script

GRASS GRASS user
1

I am trying to run r.viewshed from a bash script on ubuntu following
instruction on https://grasswiki.osgeo.org/wiki/GRASS_and_Shell "GRASS Batch
jobs". I got an error that my input tif file is not found.
I tried specifying the full path to file but get then the Error Illegal
filename
</var/www/mapdata/ilpoe/layers/results/dem30m_cut_852af91d4fe5fd938fa57893e5
991dfe.tif> Character </> not allowed.
My 3 line script is below:
--------------
export GRASS_MESSAGE_FORMAT=plain
g.region n=6446299.8941608080640435 s=5942051.4022588636726141
w=779220.9745125266490504 e=1224529.8597663976252079 res=30
r.viewshed -b input="/var/www/results/dem30m.tif"
output="/var/www/results/vis.tif"
coordinates=1127369.7301780644,6268333.160068306 observer_elevation=120
max_distance=1800 memory=2000
------------

Where is Grass looking for the input tif and how do I need to specify that ?

Thanks

Karsten Vennemann
Terra GIS LTD

2

Hi Karsten,

Not sure and not tested, but according to the error

Character </> not allowed.

I’d say you have to escape the “/” seperator.

But this is just a rough guess right now.

regards

Werner

···

On Wed, Nov 1, 2017 at 6:40 PM, karsten <karsten@terragis.net> wrote:

I am trying to run r.viewshed from a bash script on ubuntu following
instruction on https://grasswiki.osgeo.org/wiki/GRASS_and_Shell “GRASS Batch
jobs”. I got an error that my input tif file is not found.
I tried specifying the full path to file but get then the Error Illegal
filename
</var/www/mapdata/ilpoe/layers/results/dem30m_cut_852af91d4fe5fd938fa57893e5
991dfe.tif> Character </> not allowed.
My 3 line script is below:

export GRASS_MESSAGE_FORMAT=plain
g.region n=6446299.8941608080640435 s=5942051.4022588636726141
w=779220.9745125266490504 e=1224529.8597663976252079 res=30
r.viewshed -b input=“/var/www/results/dem30m.tif”
output=“/var/www/results/vis.tif”
coordinates=1127369.7301780644,6268333.160068306 observer_elevation=120
max_distance=1800 memory=2000

Where is Grass looking for the input tif and how do I need to specify that ?

Thanks

Karsten Vennemann
Terra GIS LTD

grass-user mailing list
grass-user@lists.osgeo.org
https://lists.osgeo.org/mailman/listinfo/grass-user

3

On Nov 2, 2017 6:45 AM, “karsten” <karsten@terragis.net> wrote:

I am trying to run r.viewshed from a bash script on ubuntu following
instruction on https://grasswiki.osgeo.org/wiki/GRASS_and_Shell “GRASS Batch
jobs”. I got an error that my input tif file is not found.
I tried specifying the full path to file but get then the Error Illegal
filename
</var/www/mapdata/ilpoe/layers/results/dem30m_cut_852af91d4fe5fd938fa57893e5
991dfe.tif> Character </> not allowed.
My 3 line script is below:

export GRASS_MESSAGE_FORMAT=plain
g.region n=6446299.8941608080640435 s=5942051.4022588636726141
w=779220.9745125266490504 e=1224529.8597663976252079 res=30
r.viewshed -b input=“/var/www/results/dem30m.tif”
output=“/var/www/results/vis.tif”

You need to import or register the map first. Likewise for the export.

See for an example
https://grass.osgeo.org/grass72/manuals/r.external.html#processing-workflow-without-data-import-and-export

Best
Markus

4

Yes got it working with Grass 7.0.3 (as 7.2.2 fails with “Error in `r.viewshed’: free(): invalid pointer:”
plus a Backtrace and Memory map like in https://trac.osgeo.org/grass/ticket/3285 )
Thanks
Karsten

From: neteler.osgeo@gmail.com [mailto:neteler.osgeo@gmail.com] On Behalf Of Markus Neteler
Sent: Donnerstag, 2. November 2017 09:38
To: karsten vennemann
Cc: GRASS user list
Subject: Re: [GRASS-user] were is grass looking for the input tif - r.viewshed run from bash script

On Nov 2, 2017 6:45 AM, “karsten” <karsten@terragis.net> wrote:

I am trying to run r.viewshed from a bash script on ubuntu following
instruction on https://grasswiki.osgeo.org/wiki/GRASS_and_Shell “GRASS Batch
jobs”. I got an error that my input tif file is not found.
I tried specifying the full path to file but get then the Error Illegal
filename
</var/www/mapdata/ilpoe/layers/results/dem30m_cut_852af91d4fe5fd938fa57893e5
991dfe.tif> Character </> not allowed.
My 3 line script is below:

export GRASS_MESSAGE_FORMAT=plain
g.region n=6446299.8941608080640435 s=5942051.4022588636726141
w=779220.9745125266490504 e=1224529.8597663976252079 res=30
r.viewshed -b input=“/var/www/results/dem30m.tif”
output=“/var/www/results/vis.tif”

You need to import or register the map first. Likewise for the export.

See for an example
https://grass.osgeo.org/grass72/manuals/r.external.html#processing-workflow-without-data-import-and-export

Best
Markus