You might also take a look at the r.connectivity.* tools: http://grass.osgeo.org/grass65/manuals/addons/r.connectivity.corridors.html
It looks like it uses the igraph package in R, which has good documentation. Regards, Will On Thu, Jan 8, 2015 at 6:03 PM, Markus Metz <[email protected]> wrote: > On Wed, Jan 7, 2015 at 7:27 AM, Takenori KANAI <[email protected]> wrote: > > Hello. I'm sorry by my poor English. > > > > I have analyzed distribution of wild animals using r.drain now > > (http://grass.osgeo.org/grass65/manuals/r.drain.html). > > > > Some examples have been described to "EXAMPLES" in an > > online manual. In "EXAMPLES", there are two ways of cost > > value though the Cost value of fifith step is 10. In this case, > > I do not think that there is a problem because there is a > > smaller cost value since six steps even if the fifth step > > selects either. > > However, by what algorithm has the cell been selected > > when there are two or more end points in route > > (There is a minimum same cost value as surroundings of cell. )? > > r.drain simply follows the lowest cost in the surrounding cells (must > be lower than the current cell). If more surrounding cells have the > same minimum cost, the first cell encountered is used. > > Markus M > > > > > Thanks > > > > > > Takenori K. > > _______________________________________________ > > grass-user mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/grass-user > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user >
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