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
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