TPI

TPI: Topographic position index, after Weiss (2001, ESRI user conference poster).

Apparently also in  (Wilson et al 2007, Marine Geodesy 30:3-35).

GDAL will compute  TPI,   Defined as the difference between a central pixel and the mean of its surrounding cells. 

There is also TRI , Terrain Ruggedness Index,  defined as the mean difference between a central pixel and its surrounding cells (see Wilson et al 2007, Marine Geodesy 30:3-35), and also computed by GDAL.


Last revision 11/25/2017