TPI, Topographic position index

General discussion of Roughness

TPI after Weiss (2001, ESRI user conference poster).

• http://www.jennessent.com/arcview/TPI_jen_poster.htm and http://www.jennessent.com/downloads/tpi_poster_av3.zip
• http://www.jennessent.com/downloads/tpi-poster-tnc_18x22.pdf
• http://www.jennessent.com/downloads/tpi_documentation_online.pdf

Guisan, A., S. B. Weiss, A. D. Weiss 1999. GLM versus CCA spatial modeling of plant species distribution. Plant Ecology 143: 107-122

the same as the difference to the mean calculation (residual analysis) proposed by Wilson & Gallant (2000)

Also in  ( Wilson, M.F.J., O’Connell, B., Brown, C., Guinan, J.C., and Grehan, A.J., 2007,Multiscale Terrain Analysis of Multibeam Bathymetry Data for Habitat Mapping on the Continental Slope: Marine Geodesy, 30:1-2, 3-35,DOI: 10.1080/01490410701295962).

See TRI, Terrain Ruggedness Index for how to compute and similar metrics

Compute:

• MICRODEM: normalizes distances
• GRASS (add on): parameters minradius, maxradius, steps.  https://grass.osgeo.org/grass80/manuals/addons/r.tpi.html
• GDAL

Last revision 4/28/2022