I have two cost surface rasters, one representing the costs of going uphill (or level) and the other representing costs downhill. Using these plus a DEM and a vector layer for the source point, is there a way to calculate a cumulative cost raster using QGIS?

Since the downhill function can not simply translate to uphill and the costs I calculated vary not just by slope, I can not simply use a multiplying factor.

I need to do this for a continuous surface and not a least cost path.

  • Is this post from a day earlier a duplicate?
    – Vince
    Mar 24, 2021 at 12:03
  • I hope this can help you proceedings.caaconference.org/paper/… It does describe how to handle an down and up friction. You can check if the method suit your needs Mar 24, 2021 at 14:18
  • @Vince, No, I made two posts—one for QGIS and one for ArcGIS, hoping I could get some help for either or both.
    – YamCham
    Mar 25, 2021 at 17:49


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