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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?

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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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