On mardi 19 novembre 2019 22:03:29 CET Rahkonen Jukka (MML) wrote: > Hi, > > I would like to get some hints about using gdal_grid or some other utility > for lake bathymetry. What I have is typically rather sparse point data of > depths and the shoreline that includes the islands as in the attached > image. The shoreline and all the area that is not lake basin should have > the altitude of zero in the resulting DEM. It means that interpolation > should not overshoot across the shoreline over the dry land. > > Gdal_grid seems to miss an option for handling the shoreline so I made a > test by converting the vertices of the polygon rings into depth points. I > also filled area around the lake with a gridded points of zero altitude but > the method feels stupid and tedious and the result was not so fine when it > comes to keep the shoreline and land area near it totally flat. >
Postprocessing with gdalwarp -cutline to set to zero non-lake areas ? -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
