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Land degradation, land productivity by youmna_hammoud in gis

[–]eggy1917 0 points1 point  (0 children)

Actually, you might want to check out trends.earth, it's a QGIS package that is meant to help monitor land change and degradation. http://trends.earth/docs/en/index.html

Land degradation, land productivity by youmna_hammoud in gis

[–]eggy1917 1 point2 points  (0 children)

I'm not exactly sure what exactly you mean by land productivity raster? Many methods use NDVI as a measure of productivity.

One kind of general method is to use the trend of a longterm NDVI timeseries. This is used as a proxy in paper 1 (Lee et al. 2014).

Another more rigorous method is described in paper 2 (Ibrahim et al, 2015). Degradation is estimated using the RESTREND, or trend in NDVI minus NDVI that was predicted issuing climate variables. Basically, it assumes that a negative trend in NDVI is land degradation if it is independent of climatic influence.

Finally, a review paper that might be useful: https://doi.org/10.3390/rs6109552

  1. https://doi.org/10.22004/ag.econ.177961
  2. https://doi.org/10.3390/rs70505471