One correction, that should have said: TPI "the central pixel is assigned the absolute difference between the central pixel of a 3x3 window and mean of all pixels within the 3x3 window"
Dominik Schneider o 303.735.6296 | c 518.956.3978 On Sun, Sep 21, 2014 at 5:36 PM, Dominik Schneider < [email protected]> wrote: > Hi - > I was reviewing the gdaldem documentation and the definitions provided > seem to differ from those in the cited article (Wilson et al. 2007) > For example, > TRI should be "the central pixel is assigned the mean of the absolute > differences between a central pixel and its surrounding cells" > TPI "the central pixel is assigned the absolute difference between the > central pixel of a 3x3 window and all pixels within the 3x3 window" > roughness "the central pixel is assigned the largest inter-cell > difference within the 3x3 window surrounding the central pixel" > > of course, this is assuming the algorithms are actually those presented in > the publication at the 3x3 scale as opposed to those written in the > documentation. > > I assume the source code could be checked to resolve this question? > > Thanks and my apologies if I misunderstood something. > Dominik >
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