Thank you very much Facu, It is exactly what I was looking for!
Le 11 novembre 2009 17:13, Facundo Muñoz <[email protected]> a écrit : That is more like a geographical operation. > I wrote a little GRASS script suited to do this. > http://www.geeitema.org/doc/guenmap//docs/v.costdist.mat.zip > > You have to provide a "cost" surface with zeroes over land regions, and > with a constant value over water equal to the raster resolution you are > working with. > You then can provide a vector map of "source" sites and one or more maps > with "end" sites, and the script computes all hydrological distances from > all the source sites to all the end sites and store the values in the data > tables. > Of course you can use the same map for 'source' and 'end'. In this case you > get all the distances between the sites. > > Hope it helps. > Æacu.- > > Clément Tisseuil escribió: > >> Dear r-sig-geo list members, >> >> Does anyone know if some R functions exist to calculate some hydrological >> distances between sites? By hydrological distances, I mean for example the >> 'real' distance that separates two sites throughout the river network >> connexions. >> >> Thanks in advance >> >> Clem >> >> [[alternative HTML version deleted]] >> >> _______________________________________________ >> R-sig-Geo mailing list >> [email protected] >> https://stat.ethz.ch/mailman/listinfo/r-sig-geo >> >> >> > [[alternative HTML version deleted]]
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