Thank you very much Facu,

It is exactly what I was looking for!


Le 11 novembre 2009 17:13, Facundo Muñoz <famuvie@alumni.uv.es> 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.
> ƒacu.-
>
> 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
>>
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>>
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>>
>>
>

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