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Sorry Clèment, please use the attached fixed version instead.<br>
I thaught I had the latest version on the web.<br>
<br>
Bests,<br>
ƒacu.-<br>
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Clément Tisseuil escribió:
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<pre wrap="">Thank you very much Facu,
It is exactly what I was looking for!
Le 11 novembre 2009 17:13, Facundo Muñoz <a class="moz-txt-link-rfc2396E" href="mailto:famuvie@alumni.uv.es"><famuvie@alumni.uv.es></a> a écrit :
That is more like a geographical operation.
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<pre wrap="">I wrote a little GRASS script suited to do this.
<a class="moz-txt-link-freetext" href="http://www.geeitema.org/doc/guenmap//docs/v.costdist.mat.zip">http://www.geeitema.org/doc/guenmap//docs/v.costdist.mat.zip</a>
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.
Æ’acu.-
Clément Tisseuil escribió:
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<pre wrap="">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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