[GRASS-user] r.walk output and garray
Dear Grass community, I am trying to use r.walk from python and the output file seems to be created correctly at the end of the python run. However: - while python is running I get the following error (but code keeps on running) : ERROR: Unable to create file C:\A_GRID\PM\Grass\GrassDB/Location_L3/PERMANENT/.tmp/1824.0 - All values of the output raster seem to be equal to 0.0 when I try to access them through a Grass garray. But I open the raster in Grass GUI all, I can see raster values were correctly populated for the whole raster. I get a nice cost surface. Here is the core of my code : (coord is an array containing coordinates of point in the reference system of the current region) a = garray.array() grass.run_command(g.remove, rast=cost_output) grass.run_command(r.walk, elevation=mnt_l3_toulouse@PERMANENT, friction=mnt_l3_toulouse@PERMANENT, output=cost_output, coordinate=[p1[0],p1[1]],_lambda=0) a.read(cost_output) for p2 in coord: x = int((p2[0]-w)/ewres) y = int((n-p2[1])/nsres) print a[y,x] Thanks in advance! ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] r.walk output and garray
Pierric wrote: Dear Grass community, Salut Pierric :-) I am trying to use r.walk from python and the output file seems to be created correctly at the end of the python run. However: - while python is running I get the following error (but code keeps on running) : ERROR: Unable to create file C:\A_GRID\PM\Grass\GrassDB/Location_L3/PERMANENT/.tmp/1824.0 Just wild guessing: here is ^^^ a slash in the path-name. Is this valid in Windows? Nikos [rest deleted] ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] r.walk output and garray
Hello, In fact the line of code that is causing the error is a.read(cost_output) # a is a garray At that moment it needs to create a temporary file but fails at building the correct path by putting slashes instead of back slashes (for windows) for his part. Isn't it a bug? Is there a possibility to give it the correct path? ERROR: Unable to create file C:\A_GRID\PM\Grass\GrassDB/Location_L3/PERMANENT/.tmp/29576.0 Thank you, Pierric - Mail original - De : Nikos Alexandris n...@nikosalexandris.net À : grass-user@lists.osgeo.org; Pierric pierr...@yahoo.com Cc : Envoyé le : Mardi 2 juillet 2013 14h54 Objet : Re: [GRASS-user] r.walk output and garray Pierric wrote: Dear Grass community, Salut Pierric :-) I am trying to use r.walk from python and the output file seems to be created correctly at the end of the python run. However: - while python is running I get the following error (but code keeps on running) : ERROR: Unable to create file C:\A_GRID\PM\Grass\GrassDB/Location_L3/PERMANENT/.tmp/1824.0 Just wild guessing: here is ^^^ a slash in the path-name. Is this valid in Windows? Nikos [rest deleted] ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] r.walk output and garray
Pierric: - while python is running I get the following error (but code keeps on running) : ERROR: Unable to create file C:\A_GRID\PM\Grass\GrassDB/Location_L3/PERMANENT/.tmp/1824.0 Nikos: Just wild guessing: here is ^^^ a slash in the path-name. Is this valid in Windows? Yeah I think it is valid in that context actually, even if it looks weird. I'd check if the .tmp/ directory really exists and if you can create new files there by hand. Hamish ps- using PERMANENT as the day-to-day working mapset is not recommended. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
