Luís Ferreira pisze:
At page 235 from book "OPEN SOURCE GIS - A GRASS GIS Approach" 3rd
edition:
"Natural neighbor interpolation is implemented in addon module
r.surf.nnbathy. It uses “nn” – a natural neighbor interpolation
library and allows the user to define breaklines such as stream lines
or ridges as 2D lines without the need to define their elevation"
That's not possible. r.surf.nnbathy accepts only a single raster map as
input.
Maciek
--
Maciej Sieczka
http://www.sieczka.org
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