Hot answers tagged grass
The way I have done this in the past is to convert buildings, forested areas, etc. to a raster (rasterize the polygon using the height column for the raster value, using the same pixel resolution as the DEM). Then merge the two rasters (DEM and rasterized buildings). This will add the building height to the DEM. One thing to note is that you will probably ...
The r.li suite has been completely rewritten. While in the past it ran in parallel mode, the results were not reliable. The only way was to rewrite it from scratch at the expense of the multi-core approach. Please try a recent (i.e. less than 1 week) SVN snapshot of GRASS GIS 7 to use the now working version of r.li.
Nine points is a quite small number, so I would use some arbitrary boundary instead of trying to build a complex algorithm that might "go wild". I suggest that you use r.grow.distance in grass to create a distance layer around your points, and to set a threshold that would constraint the size of your study area (for instance, the largest distance value ...
I would like to reply myself after a while. This is caused because the weigth of the layers it's too high, and the Pandolf's formula used it's very sensitive to this. Lowering the weight was the solution to my problems. This is a formula used commonly in archaeology.
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