Hi, 2014-03-04 19:25 GMT+01:00 Mark Seibel <[email protected]>:
> Are there specific inputs of the "topo to raster" tool that are of > importance for your application? not really I just want to show my students that almost everything what they are doing in the class using ArcGIS they can do using open source GRASS GIS quite easily :-) > Using contour lines as input, I have found the r.surf.nnbathy module to > perform very well. For (LiDAR) point data, my preference is v.surf.rst. Right, `r.surf.nnbathy` is based on Pavel Sakov's nn natural neighbor interpolation library. This library is provided in MIT licence. Then we could probably incorporate it into main GRASS source code, right? I found code in Addons [1], btw, link at [2] doesn't work. The module is written as a bash script and needs to be ported to Python for G7. What do you think? > If one wanted to mimic the arcgis method of filling sinks after > interpolating, one could run iterations of r.fill.dir to make it > depression-less. This isnt necessary with the hydrologic tools in GRASS > because the r.watershed algorithm is intelligent enough to keep seeking the > next lowest location the DEM. Add in the fact that r.watershed has MFD, and > GRASS quickly surpasses the ESRI hydrologic toolset offerings. Thanks for clarification. Martin [1] http://trac.osgeo.org/grass/browser/grass-addons/grass6/raster/r.surf.nnbathy/r.surf.nnbathy [2] http://grasswiki.osgeo.org/wiki/AddOns/GRASS_6#r.surf.nnbathy -- Martin Landa * http://geo.fsv.cvut.cz/gwiki/Landa _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
