[GRASS-user] GRASS 6.4 How to extract point-values from multiple rasters

Markus Metz markus.metz.giswork at gmail.com
Sun Apr 7 05:35:41 PDT 2013

On Sun, Apr 7, 2013 at 1:23 PM, Tim Michelsen
<timmichelsen at gmx-topmail.de> wrote:
>>> r.what [1] just prints out.
>>> > Isn't the right tool v.sample [2]?
>> r.what extracts values from one or more raster maps at locations given
>> by coordinates.
>> v.what.rast uploads raster values at positions of vector points to the table.
> But why is there v.sample if all other commands have similar functionality?

v.sample is useful for cross-validation after surface interpolation:
it samples a raster map with nearest neighbor, bilinear or bicubic,
compares the sampled raster value to a point attribute and writes out
the difference in a new vector map. No other module can do that

Markus M

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