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?
- 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?user92055– user920552017-09-25 20:24:35 +00:00Commented Sep 25, 2017 at 20:24
- 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. Herrera– Guido A. Herrera2017-09-26 20:58:07 +00:00Commented Sep 26, 2017 at 20:58
- 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.htmluser92055– user920552017-09-27 16:44:28 +00:00Commented Sep 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
- 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.Guido A. Herrera– Guido A. Herrera2017-09-26 21:00:29 +00:00Commented Sep 26, 2017 at 21:00
- You first run
r.watershedto create the flow direction raster, then use that forr.stream.order.Micha– Micha2017-09-28 05:12:48 +00:00Commented Sep 28, 2017 at 5:12