[GRASS-user] creating custom filter with r.mfilter
Any working code I can start with to create custom filters? I basically want to run the speckle filters in GRASS. Sample filters are explained here: http://resources.arcgis.com/en/help/main/10.1/index.html#//009t01z700 -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] help me, please!
Albert Saribekyan. hi all, when I run g.region in text mod, there was an error GRASS 6.4.2RC2 (newlocation):~ g.region g.region: error while loading shared libraries: libgeos-3.1.0.so: cannot open shared object file: No such file or directory regards, Albert ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] help me, please!
On Mon, Aug 6, 2012 at 2:31 PM, Albert Saribekyan albertsaribek...@rambler.ru wrote: GRASS 6.4.2RC2 (newlocation):~ g.region g.region: error while loading shared libraries: libgeos-3.1.0.so: cannot open shared object file: No such file or directory You need to install the geos library package for your system. Markus ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] creating custom filter with r.mfilter
I forgot to mention that there is a screenshot example with PALSAR: https://svn.osgeo.org/grass/grass-addons/grass6/imagery/i.despeckle/description.html Cheers Markus On Mon, Aug 6, 2012 at 4:32 PM, Markus Neteler nete...@osgeo.org wrote: On Mon, Aug 6, 2012 at 12:54 PM, maning sambale emmanuel.samb...@gmail.com wrote: Any working code I can start with to create custom filters? I basically want to run the speckle filters in GRASS. I have implemented a SAR Speckle Filter module, uploaded right now to GRASS 6 Addons. For now only the GAMMA SAR Speckle Filter is implemented. Installation: g.extension i.despeckle Please expand with other filters (Lee, Frost etc.) Markus -- http://gis.cri.fmach.it/neteler/ ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Parallelization of Python Script
Dear GRASS users, I am running serveral task in GRASS in python scripts. Most of them involve for-loops, e.g. to run various raster modules with different input. In the end all the result maps are mostly aggregated to one final map. Anyway the maps are generated during the loops in a serial process which takes quite some time. Thus I thought one could pseudo-parallelize the python scripts. As I very unexperienced in this field I just read the wiki where it states that one could perform the single parts in own mapsets and then run the task in parallel. I attached I short example python script which looks similar to ones I am using involving the r.cost module (one out of several others) which I run inside a for loop. I tried to understand the example in the wiki (http://grass.osgeo.org/wiki/Parallelizing_Scripts#Python) but I can't transfer it to my task. Maybe someone is more experienced than me and wants to help to improve the speed of such scripts if this is generally possible (in GRASS 6). I think this can also be quite interesting to other users. Best regards, /Johannes GRASS_Parallel_skript.py Description: Binary data ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Parallelization of Python Script
Hi Johannes, One very simple trick would be to switch off using grass.run_command with grass.start_command. grass.start_command() spawns a child process that and continues on to the next line of code, so that you can have several processes going simultaneously. You just have to make sure that the processes play nice with each other and don't cause any problems. It's not the most elegant solution, but it's one that works for many things :) Best, Daniel -- B.Sc. Daniel Lee Geschäftsführung für Forschung und Entwicklung ISIS - International Solar Information Solutions GbR Vertreten durch: Daniel Lee, Nepomuk Reinhard und Nils Räder Softwarecenter 3 35037 Marburg Festnetz: +49 6421 379 6256 Mobil: +49 176 6127 7269 E-Mail: l...@isi-solutions.org Web: http://www.isi-solutions.org 2012/8/6 Johannes Radinger johannesradin...@gmail.com Dear GRASS users, I am running serveral task in GRASS in python scripts. Most of them involve for-loops, e.g. to run various raster modules with different input. In the end all the result maps are mostly aggregated to one final map. Anyway the maps are generated during the loops in a serial process which takes quite some time. Thus I thought one could pseudo-parallelize the python scripts. As I very unexperienced in this field I just read the wiki where it states that one could perform the single parts in own mapsets and then run the task in parallel. I attached I short example python script which looks similar to ones I am using involving the r.cost module (one out of several others) which I run inside a for loop. I tried to understand the example in the wiki (http://grass.osgeo.org/wiki/Parallelizing_Scripts#Python) but I can't transfer it to my task. Maybe someone is more experienced than me and wants to help to improve the speed of such scripts if this is generally possible (in GRASS 6). I think this can also be quite interesting to other users. Best regards, /Johannes ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Parallelization of Python Script
Daniel wrote: One very simple trick would be to switch off using grass.run_command with grass.start_command. grass.start_command() spawns a child process that and continues on to the next line of code, so that you can have several processes going simultaneously. You just have to make sure that the processes play nice with each other and don't cause any problems. It's not the most elegant solution, but it's one that works for many things :) ( when it works, it works pretty well) for an example of grass.start_command() for parallelizing a bunch of r.cost runs, see v.surf.icw(.py) in grass7 addons: https://trac.osgeo.org/grass/browser/grass-addons/grass7/vector/v.surf.icw/v.surf.icw.py maybe a bit more complicated than you need, but hopefully enough to give you an idea. Other grass7 python scripts which have been parallelized are listed in the grass wiki page. e.g. r3.in.xyz. Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
