I have these rasters:

  1. DEM
  2. Flow Direction
  3. Flow Accumulation

I would like to calculate the flow distance of every pixel to the outlet of a basin.

In Arc-GIS, I can use the flow length. But I don't have access to a license right now. Any other open source way to do it?

  • 2
    Dooku and Yoda. Funny.
    – user32309
    Dec 25 '15 at 0:25

The GRASS addon r.streams.distance is what you need. You add it to GRASS 7 using the g.extension module to install addons.


Use the SAGA tool for this. Look at this: http://www.saga-gis.org/saga_module_doc/2.1.3/ta_hydrology_6.html

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