Hello All, I have to transform a DSM from a local CRS such as those produced by the trimble site calibration process ( : https://help.trimblegeospatial.com/TrimbleAccess/2018.10/en/Calibration.htm), to WGS84 ellipsoidal coordinates. The local CRS is defined by a projection (in this case transverse mercator) plus vertical and horizontal adjustment. Horizontal adjustment is a 2D similarity and thus can be described with a 2D Helmert transform. Vertical adjustement is a geoid model in the form of an inclined plane thus it could be described using an affine transform. I have written a proj pipeline able to realize this transformation. It works great for vector file transformations (thanks to the new GDAL 3 release) but it doesn't work for DSM transformation since the affine transform step used for the vertical adjustment seems to be not supported by gdalwarp (the pixels values stay unchanged). I guess that gdalwarp only support vertical grid shift to handle pixel value modifications, but anybody can confirm me this ? If no, which method can accomplish this DSM transformation ? If yes, do you plan to support other 3D transformation with gdalwarp at short or mid terms ?
Best regards <http://bit.ly/delair-home-signature> <http://bit.ly/delair-twitter> <http://bit.ly/delair-linkedin> <http://bit.ly/delair-facebook> <http://bit.ly/delair-youtube> <http://bit.ly/delair-instagram> Aurélien Vila Computer Vision Engineer 676, Rue Max Planck – 31670 Labège - FRANCE Tel: +33 9 71 16 99 01 www.delair.aero <http://bit.ly/delair-home-signature>
_______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev