Patrick, Thanks for the report. It was indeed not working as documented. Fixed per https://trac.osgeo.org/gdal/ticket/6608
Even > Hi all, > > We've been making some orthos with gdalwarp (gdal version 2.1.1) and > encountering resampling errors in the output (gittery output in the lines > in certain spots). Long story short, explicitly setting the "-et" option > to "0" fixed it, but the docs for gdalwarp say the following (under the -et > flag description): > > "starting with GDAL 2.1, the RPC_DEM warping option is specified, in which > case, an exact transformer, i.e. err_threshold=0, will be used" > > Here's an example of the call we're making where we see the artifacts: > > gdalwarp -t_srs EPSG:3857 -rpc -to RPC_DEM=dem.tif in.tif out.tif > > and this guy fixes it: > > gdalwarp -et 0 -t_srs EPSG:3857 -rpc -to RPC_DEM=dem.tif in.tif out.tif > > I'm guessing the flag is not actually being set, but if anyone can point me > to the code where this default is supposed to be set when the dem is > specified, I might be able to provide a fix or figure out that I'm doing it > wrong! I didn't have much luck searching through the github archive. > > Thanks! > > -Patrick -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
