Hi.
> > Using contour lines as input, I have found the r.surf.nnbathy module to > > perform very well. > > Previously, contour lines created by land surveying provided more > detail than available DEMs. Nowadays (since SRTM of 2001), DEMs > provide more detail than contour lines and contour lines are usually > derived from a DEM. Therefore creating a DEM from contour lines which > if in doubt have been created using a DEM is no longer recommended, > rather use any DEM instead. > > I certainly agree that contour lines are poor quality input data, however, for situations involving conceptual reclamation, contours are used to build the post-development DEM. This still allows for (albeit generalized) conceptual modeling of the drainage areas for reclaimed streams and drainage areas, and allows for pre/post development analysis of drainage areas (as it is understood the contours are conceptual, not as-built). Nice to know that GRASS has modules that can cope with contour data, and still produce adequate and reliable results. Mark
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