SAGA.ta_morphometry.16: Terrain Ruggedness Index (TRI)
References:<br/>Riley, S.J., De Gloria, S.D., Elliot, R. (1999): A Terrain Ruggedness that Quantifies Topographic Heterogeneity. Intermountain Journal of Science, Vol.5, No.1-4, pp.23-27. <a href="http://www.fw.msu.edu/~rileysh2/Terrain%20Ruggedness%20Index.pdf">online</a>.<br/>
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