Re: [GRASS-user] add a centroid in the center of polygon
On 25/01/14 12:52, Markus Metz wrote: On Sat, Jan 25, 2014 at 12:27 PM, Markus Neteler nete...@osgeo.org wrote: On Sat, Jan 25, 2014 at 12:08 PM, Markus Metz markus.metz.gisw...@gmail.com wrote: On Sat, Jan 25, 2014 at 12:10 AM, Milton Ribeiro miltinho.astrona...@gmail.com wrote: Dear all, I have a polygon vector, and need to add point in the center of mass of each one. I used v.centroid, but it adds just a centroid, but not in the central position of the polygon area. v.centerpoint from addons [0] does that. Markus M [0] http://grasswiki.osgeo.org/wiki/AddOns/GRASS7/vector#v.centerpoint Right, I forgot about this nice addon! Perhaps its functionality might be merged into v.centroids [1]? No, because the center of mass is not always within the area. But couldn't that be a documented flag (e.g. something like this: 'always place centroid within the area (for GRASS polygon)'). Personally, I support MarkusN's idea of merging the two, if that's possible from the code point of view. I find it more intuitive to look for a module creating centroids... Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Transforming raster lines to vectors with correct segment attributes
Hi, I have a raster river (processed with r.thin) which I want to transfrom to a vector. Therefore I use r.to.vect with the lines option. However, the raster has two different values representing e.g. habitat quality (good/bad) for single segments (group of raster cells). This information is written strangely to the vector attribute table as the lines are not broken at changes of habitat quality which is a reasonable behaviour of r.to.vect. As I need the attributes in my vector table I thought about splitting the vector into small segments (raster resolution) and updating the attribute table with v.what.rast. However when I use v.split the attribute table of the created map still has the same number of entries than before. So what do I miss here to get single rows and thus categories for the single created lines from v.split? Or is there any other/better way for such transformation of raster lines to vector lines incl. an update of the attribute table? Best regards, Johannes ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Python script works with Qgis but not in Grass
Hello to everyone, i got Windows 8 with QGIS Dofour 2.0.1 e Grass 6.4.3 on my PC. I got no problem when i run my script on Qgis but i need to fix some problems inside it and Qgis doesn't show you any log errors so i need to use Grass. When i launch it some errors happens: Launching script 'C:\Program Files\QGIS Dufour\apps\grass\grass-6.4.3\etc\gui\scripts\v.grass2hec_rev.py'... Exception in thread Thread-75: Traceback (most recent call last): File C:\PROGRA~1\QGISDU~1\apps\Python27\lib\threading.py, line 808, in __bootstrap_inner self.run() File C:\PROGRA~1\QGISDU~1\apps\grass\grass-6.4.3\etc\wxpy thon\gui_core\goutput.py, line 126, in run self.resultQ.put((requestId, self.requestCmd.run())) File C:\PROGRA~1\QGISDU~1\apps\grass\grass-6.4.3\etc\wxpy thon\core\gcmd.py, line 553, in run env = env) File C:\PROGRA~1\QGISDU~1\apps\grass\grass-6.4.3\etc\wxpy thon\core\gcmd.py, line 164, in __init__ subprocess.Popen.__init__(self, args, **kwargs) File C:\PROGRA~1\QGISDU~1\apps\Python27\lib\subprocess.py, line 711, in __init__ errread, errwrite) File C:\PROGRA~1\QGISDU~1\apps\Python27\lib\subprocess.py, line 948, in _execute_child startupinfo) TypeError: environment can only contain strings First of all I uninstall and reinstall Qgis and Grass many times trying to understand if the problem was in the x86 version or in some registry forgot in the previous versions (i control the regedit deleting manually all the files i thought related to Qgis and Grass). Then, i remembered that I installed Python one month ago (not in the same folder), then i uninstall it. I fear to forgot some other registry but nothing is shown directly in the registry. All the Python27 are deleted. Now i reinstall QGIS and Grass (version i told before) but still it doesn't work. Really need a big help. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] how to draw line with arrow mark to line top (tip)
sgw00...@nifty.com a écrit : I do not find how to draw line with arrow mark to line top (tip). I'm not sure if it matches your needs or not, but see also d.rast.arrow and the d.barb addon (d.barb can take either raster or vector maps as input); for a single arrow symbol the d.mark addon script might help. Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Python script works with Qgis but not in Grass
Dear list, this problem has already reported for grass 7 [0] (still without a solution?) I am not a Python expert, but accordind to [1] the problem seems due to Unicode string management. Davide, I suppose the script path used with Grass is:something like this: C:\[...]\QGIS Dufour\apps\grass\grass-6.4.3\etc\gui\scripts but probabliy this is not the same path where you put the same script in order to use QGIS scripting interface, right? List, any hint to check startupinfo values before launching the script ? Could we avoid Unicode strings or force it to right values as in [2] ? HTH Enrico [0] http://lists.osgeo.org/pipermail//grass-user/2013-October/069019.html [1] https://mail.python.org/pipermail/python-win32/2010-April/010400.html [2] https://github.com/SeleniumHQ/selenium/pull/54/files ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] R: Python script works with Qgis but not in Grass
Directory 'C:\Users\Davide\Documents\ is not defined in GRASS_ADDON_PATH. Do you want add this directory to GRASS_ADDON_PATH? I think that's what you meaning... Messaggio originale Da: enrico.ga...@gmail.com Data: 27-gen-2014 13.52 A: GRASS user listgrass-user@lists.osgeo.org Ogg: [GRASS-user] Python script works with Qgis but not in Grass Dear list, this problem has already reported for grass 7 [0] (still without a solution?) I am not a Python expert, but accordind to [1] the problem seems due to Unicode string management. Davide, I suppose the script path used with Grass is:something like this: C:\[...]\QGIS Dufour\apps\grass\grass-6.4.3\etc\gui\scripts but probabliy this is not the same path where you put the same script in order to use QGIS scripting interface, right? List, any hint to check startupinfo values before launching the script ? Could we avoid Unicode strings or force it to right values as in [2] ? HTH Enrico [0] http://lists.osgeo.org/pipermail//grass-user/2013-October/069019.html [1] https://mail.python.org/pipermail/python-win32/2010-April/010400.html [2] https://github.com/SeleniumHQ/selenium/pull/54/files ___ 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] add a centroid in the center of polygon
Hi Moritz I agree that a flag would be a good way .. Best wishes miltinho 2014-01-27, Moritz Lennert mlenn...@club.worldonline.be: On 25/01/14 12:52, Markus Metz wrote: On Sat, Jan 25, 2014 at 12:27 PM, Markus Neteler nete...@osgeo.org wrote: On Sat, Jan 25, 2014 at 12:08 PM, Markus Metz markus.metz.gisw...@gmail.com wrote: On Sat, Jan 25, 2014 at 12:10 AM, Milton Ribeiro miltinho.astrona...@gmail.com wrote: Dear all, I have a polygon vector, and need to add point in the center of mass of each one. I used v.centroid, but it adds just a centroid, but not in the central position of the polygon area. v.centerpoint from addons [0] does that. Markus M [0] http://grasswiki.osgeo.org/wiki/AddOns/GRASS7/vector#v.centerpoint Right, I forgot about this nice addon! Perhaps its functionality might be merged into v.centroids [1]? No, because the center of mass is not always within the area. But couldn't that be a documented flag (e.g. something like this: 'always place centroid within the area (for GRASS polygon)'). Personally, I support MarkusN's idea of merging the two, if that's possible from the code point of view. I find it more intuitive to look for a module creating centroids... Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- Miltinho - m...@rc.unesp.br Laboratório de Ecologia Espacial e Conservação - LEEC Depto de Ecologia - UNESP - Rio Claro Av. 24A, 1515- Bela Vista 13506-900 Rio Claro, SP, Brasil Fone: +55 19 3526-9647 (office) 19 3526-9680 (lab) Cel: 19 9853-3220 / 19 9853-5430 Depto Ecologia http://ib.rc.unesp.br/#!/departamentos/ecologia/ PG ECO BIODIV http://ib.rc.unesp.br/#!/departamentos/ecologia/pos-graduacao-em-ecologia-e-biodiversidade/ CV http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4792988H6mostrarNroCitacoesISI=truemostrarNroCitacoesScopus=true Google citations http://scholar.google.com/citations?user=OWX_2eAJ ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
