I just updated my OSGeo4W and now have QGIS 2.6.1 and GRASS 6.4.4 and am trying to get strahler stream order.

I am figuring out GRASS 6.4.4 GUI by itself but GRASS is easier withing QGIS, however, I opened the GRASS GUI & used "FETCH" to obtain all the latest tools needed and I have found 'help' files that state people are using the r.stream.xxx tools through QGIS, however I cannot find them in the GRASS Tools modules list with in QGIS? I have not been able to use them. I have a process down that runs fast, but only up to the WATERSHED tool, I have not figured out how to get Strahler order from those outputs withing QGIS?


If you're wanting to use GRASS within QGIS, you can use GRASS tools from the QGIS Processing Toolbox which contains tools from QGIS, GRASS and many others:

Processing toolbox for r.stream

Processing toolbox for strahler order

Make sure the folder paths are correct for each provider via Processing > Options and configuration > Providers

  • Thanks - I did not look at the processing toolbar since I upgraded and was trying to work in GRASSTools. This is great. – als Jan 22 '15 at 12:02
  • @als, most welcome buddy and hope you get the results you want! – Joseph Jan 22 '15 at 12:04
  • this might need to be a different thread- i found the r.streams. which I knew would need a flow direction - so I ran r.watershed. great outputs - but the default names nor output names do not match up with the requirements for input in r.streams.order??? any idea where I can find that information - for example. r.stream.order input states 'stream mask' - i also need to be able to figure out which file is the flow accumulation & then how to set the threashold in the accumulation file for strahler order. There are several ways to get strahler order and I am looking for a good workflow. – als Jan 22 '15 at 18:50

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