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.
r.drain works for me as expected when the input comes from r.cost, i.e. movement directions are supplied. In this case the path does not stop at a border. If the input is a DEM and directions are not supplied, r.drain stops at borders, as it should do, because drainage the direction can not be determined. r.drain, as the name implies, traces a drainage path by following the steepest slope. It is not a least cost path search module, for that you need to use r.cost + r.drain. 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
