In this video tutorial i will show how to calculate Terrain Ruggedness Index (TRI) in QGIS. This analysis requires DEM (Digital Elevation Model). According to Riley et al. (1999) Ruggedness Index is a quantitative measurement of terrain heterogeneity or measure of local elevation variability (Maan Habib, 2021).

According to Shawn J.Riley, Stephen D.DeGloria and Robert Elliot (1999), TRI can be classified into Range of values:
1. 0 – 80 m = Level
2. 81 – 116m = Nearly Level
3. 117 – 161 m = Slightly Rugged
4. 162 – 239 m = Intermediately Rugged
5. 240 – 497 m = Moderately Rugged
6. 498 – 958 m = Highly Rugged
7. 959 – 4367 m = Extremely Rugged

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Reference:
a. Shawn J.Riley, Stephen D.DeGloria and Robert Elliot (1999). A Terrain Ruggedness Index that Quantifies Topographic heterogeneity. Intermountain Journal of Science. Link:
https://download.osgeo.org/qgis/doc/r...
b. Christian Nellemann and Gareth Fry (1995). Quantitative Analysis of Terrain Ruggedness in Reindeer Winter Grounds. Arctic Vol. 48(2).
c. Maan Habib (2021). Quantifying Topographic Ruggedness Using Principal Component Analysis. https://doi.org/10.1155/2021/3311912

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Chapter
00:00 Introduction
00:27 Calculating TRI in QGIS
02:23 Classification of TRI Values

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