Re: [Qgis-user] Strahler order vector files

Thu, 05 Nov 2020 03:25:20 -0800


On 11/5/2020 1:08 PM, [email protected] wrote:

I am working my way through QGIS for Hydrological Applications Recipes for Catchment Hydrology and Water Management.

 

I have been shown how to create Strahler order stream classification on Raster data.

 

I have access to a vector dataset of streams – is there something in QGIS that will do Strahler orders for vector data.

 

Yes I have tried to search and rally only came up with some useless Stack exchange threads plus reference to v.stream.order which is something in Grass and I am not sure whether it would work.


AFAIK, v.stream.order requires a stream network that is:

  1. topologically correct = each segment has a node where it intersects the next segment.
  2. the line segment directions are all downstream.

If those two conditions are OK, it should work


 

Any advice would be helpful – I have assigned Strahler orders manually and it is a bit time consuming.


My advice: get a suitable DEM and run the GRASS modules r.watershed and r.stream.order

These work well, and insure a properly connected stream network with stream order built in.


 

Cheers

 

Dr Iain Stuart

JCIS Consultants

P.O. Box 2397

Burwood North

NSW, 2134

 

(02) 9701 0191
(0413) 380116 (m)

 


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