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While delineating catchment in QGIS using Upslope Area, error:could not create index insufficient memory prompted and software got hang again and again. What should I do?

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This may be a duplicate of Kernel Density Error in QGIS Processing

Catchment delineation tools generally need to load the full raster into memory. You can get around this by:

  • working on a subset,
  • using swap (which may be very slow),
  • reducing the resolution to get a general answer for the full dataset, then working on the coarser catchments using a higher resolution.

See also https://sagatutorials.wordpress.com/trouble-shootoing/

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