I am looking to get Strahler Stream Order vector from a flow accumulation raster of a river network. I only find solutions with an elevation or direction raster.
Can I do this with GRASS?
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I think most require flow direction. You can generate this from the DEM and then generate the order. Why are you restricted to performing this on flow accumulation alone?– user92055Sep 25, 2017 at 20:24
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Because I already have the stream network with the accumulation raster, but not the DEM associated and I need use that stream network for other analysis.– Guido A. HerreraSep 26, 2017 at 20:58
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1looks like you can use the stream network (vector) on it's own if topologically correct to generate strahler order. grass.osgeo.org/grass72/manuals/addons/v.stream.order.html– user92055Sep 27, 2017 at 16:44
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1 Answer
Have a look at the GRASS addon r.stream.order. You can see an overview at here and more details in the main page
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I already look this addon, but the problem is that require the direction raster and I only have the flow accumulation raster for my stream network. At least that there is some way to calculate the direction from accumulation. Sep 26, 2017 at 21:00
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You first run
r.watershedto create the flow direction raster, then use that forr.stream.order.– MichaSep 28, 2017 at 5:12