Hi Markus I am using this commands.
r.cost -k input=friction_landuse_roads output=cost_map start_points=map_source_pt stop_points=map_target_pt --o r.drain input=cost_map output=drain_map vector_points=map_target_pt --o I have not a direction map, and as for other source-target-friction maps everything works fine without direction map I thougth that this should work for all. If you have the chance, please run the command and take a look that the drain line finish on right border. best wishes miltinho 2012/12/30, Markus Metz <markus.metz.gisw...@gmail.com>: > On Sun, Dec 30, 2012 at 8:59 PM, Milton Cezar Ribeiro > <miltinho.astrona...@gmail.com> wrote: >> Hi Rashad >> >> I tested with the trunk svn, but apparently it still not worked to me. >> Are you able to test with my datased? >> >> https://www.yousendit.com/download/UW16RE9zTkxlM1JBSXNUQw > > What are the commands you used? I found > r.drain input=custo_aux_cost output=custo_aux_cost_drain > vector_points=map_target_pt > > You need to also provide a direction map with the indir option of r.drain. > > Markus M > >> >> Thanks! >> >> miltinho >> >> 2012/12/27, Mohammed Rashad <mohammedrasha...@gmail.com>: >>> Hi Milton, >>> >>> I think this fix will solve the problem[0]. For elevation data there >>> might >>> be cases where no path exists ie, only single pixel is the selected path. >>> I >>> had tested it by myself and it worked. >>> >>> Please apply the patch and let me know. >>> >>> If any problem comes in compilation or doing r.drain let me know. It >>> will >>> be great if you can share the test data you are using in case not >>> working >>> after applying the patch >>> >>> [0] http://trac.osgeo.org/grass/attachment/ticket/1840/r.drain.diff >>> [1] http://trac.osgeo.org/grass/attachment/ticket/1840/drain.c >>> >>> >>> On Thu, Dec 27, 2012 at 2:31 AM, Milton Cezar Ribeiro < >>> miltinho.astrona...@gmail.com> wrote: >>> >>>> Hi Mohamed and Markus >>>> >>>> Mohamed, thanks for your reply, I will wait for a solution within GRASS >>>> :-) >>>> >>>> Markus, thanks for your reply,. Sorry but I disagree a tiny bit, >>>> because is expected that between a source and target I will find a >>>> solution with the Least Cost path. Do you think that is there any >>>> situation where a least cost between source and target will not be >>>> found? Maybe if other software provide the soluction, although is not >>>> the bestest option, I prefere receive one complete output than a >>>> broken one. >>>> >>>> Happy new year! >>>> >>>> miltinho >>>> >>>> 2012/12/23, Markus Metz <markus.metz.gisw...@gmail.com>: >>>> > On Sun, Dec 23, 2012 at 7:07 PM, Milton Cezar Ribeiro >>>> > <miltinho.astrona...@gmail.com> wrote: >>>> >> Dear all, >>>> >> >>>> >> I am running a least cost path analysis combining r.cost and >>>> >> r.drain. >>>> >> But on some cases, when the least cost path between source and >>>> >> target >>>> >> reach the border of my map, r.drain stop on that position, and >>>> >> target >>>> >> point isn´t reached. >>>> > >>>> > This is correct because at the borders, the direction can not be >>>> > determined, the path could lead out of the current region, you can >>>> > not >>>> > tell. >>>> > >>>> > Running on other softwares the algorithms the >>>> >> source and target is connected using edges without problem. >>>> > >>>> > If in doubt, I would call it a bug in that other software. >>>> > >>>> >> >>>> >> Any hint are welcome. >>>> > >>>> > Try to expand the current region >>>> > >>>> > Markus M >>>> > >>>> >>>> >>>> -- >>>> 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://www.rc.unesp.br/ib/ecologia/ >>>> >>>> PG ECO & BIODIV >>>> http://www.rc.unesp.br/ib/ecologia/posbiodiversidade/index.php >>>> >>>> CV >>>> http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4792988H6&mostrarNroCitacoesISI=true&mostrarNroCitacoesScopus=true >>>> >>>> Google citations http://scholar.google.com/citations?user=OWX_2eAAAAAJ >>>> _______________________________________________ >>>> grass-user mailing list >>>> grass-user@lists.osgeo.org >>>> http://lists.osgeo.org/mailman/listinfo/grass-user >>>> >>> >>> >>> >>> -- >>> Regards, >>> Rashad >>> >> >> >> -- >> 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://www.rc.unesp.br/ib/ecologia/ >> >> PG ECO & BIODIV >> http://www.rc.unesp.br/ib/ecologia/posbiodiversidade/index.php >> >> CV >> http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4792988H6&mostrarNroCitacoesISI=true&mostrarNroCitacoesScopus=true >> >> Google citations http://scholar.google.com/citations?user=OWX_2eAAAAAJ > -- 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://www.rc.unesp.br/ib/ecologia/ PG ECO & BIODIV http://www.rc.unesp.br/ib/ecologia/posbiodiversidade/index.php CV http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4792988H6&mostrarNroCitacoesISI=true&mostrarNroCitacoesScopus=true Google citations http://scholar.google.com/citations?user=OWX_2eAAAAAJ _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user