I have read Riley, S. J., S. D. DeGloria and R. Elliot (1999). A terrain ruggedness index that quantifies topographic heterogeneity, Intermountain Journal of Sciences, vol. 5, No. 1-4,1999, but might someone be able to tell me how the "Ruggedness Index" calculation is performed in QGIS? In particular, the "Z factor" seems to have no effect on the result. I have a passing familiarity with Python, so could probably figure out how the code works, if that would help the explanation.
Thanks! -- Mark Polczynski
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