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<div class="moz-cite-prefix">On 11/20/2015 01:02 AM, wcd wrote:<br>
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<blockquote
cite="mid:CACDVBKEkE28MiVDNuwhmTbrhEWtB_9VKTVAMvju9BpfMx2aU9Q@mail.gmail.com"
type="cite">
<div dir="ltr"><span style="font-size:12.8px">Hello all,</span>
<div style="font-size:12.8px">Does GRASS have a tool equivalent
to what ArcGIS calls <a moz-do-not-send="true"
href="http://resources.arcgis.com/EN/HELP/MAIN/10.2/index.html#/Flow_Accumulation/009z00000051000000/"
target="_blank">Flow Accumulation</a>? Input is a flow
direction raster and output is a cumulative catchment area
raster. As an optional argument you can specify a weight
raster, which is really important for what I am trying to do -
count cells of woodland upstream from each cell in the flow
direction grid.</div>
<div style="font-size:12.8px"><br>
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<div style="font-size:12.8px">All GRASS tools I thought could do
this require DTM as input, not flow direction raster, and they
also don't allow to specify the weight raster. As far as I can
see.</div>
<div style="font-size:12.8px"><br>
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As far as I can see, you have one option: r.drain creates drainage
lines based on a flow direction grid and and input grid ("weight"
raster). With the "-a" flag the total weights are placed into the
output cells. But this module gives you accumulation only along the
drainage lines, NOT a full flow accumulation grid.<br>
<br>
<blockquote
cite="mid:CACDVBKEkE28MiVDNuwhmTbrhEWtB_9VKTVAMvju9BpfMx2aU9Q@mail.gmail.com"
type="cite">
<div dir="ltr">
<div style="font-size:12.8px">Do you know about any other OSGeo
tools that could do this? Ideally Python friendly?</div>
<div style="font-size:12.8px">Best regards,</div>
<div style="font-size:12.8px">Filip Kral.</div>
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<div class="moz-signature">-- <br>
<div dir="LTR">
Micha Silver<br>
Arava Drainage Authority<br>
+972-523-665918
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