On Wed, Dec 26, 2012 at 10:01 PM, 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.
Ah, you are right, if the input is output from r.cost, the cost directions should be used. Depending on the input data and the region extents, the least cost path found may not be the real least cost path, but there should be one solution. There are situations where there is no connection between source and target if source and target are separated by NULL cells and no NULL cost is specified to r.cost. Markus M > > 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
