The DSMs are both GeoTiffs produced by WebOdm. The CRS ESPG:32612 - WGS84/UTM zone 12N
On Thu, Jul 27, 2023 at 1:07 PM Greg Troxel via QGIS-User < [email protected]> wrote: > Mark C Quilter via QGIS-User <[email protected]> writes: > > > We flew the same site last month and produced orthomosaic, point cloud, > and > > DSM. However, we were not able to put out ground control so we needed > to > > rectify the images in QGIS so they would align with the 20213 imagery and > > models. We were able to align the orthomosaic using Georeferencer ( > > 3.28.2). We have not been able to rectify the DSM. > > > > To attempt to rectify the DSM we used the same control points as used for > > the orthomosaic (the surface model was aligned with the orthomosaic). > This > > produces a file but its location was out of the mapping area and the > > elevation data was no longer correct. We also used the 4 corners of the > > DSM for the control points in Georeferencer (these corners are the same > > corner extents as the rectified orthomosaic. This also produced a > geotiff > > somewhere on earth with no elevation data. > > You didn't explain what file formats the DEM and DSM are in. I wonder > if you can preprocess them to tiff and then use the georeferencer. > > I am guessing you are working in NAD83 2011 (epoch 2010.0) either UTM or > SPC as both project CRS and output CRS for all of your georeferencing. > > You might look at the data in the output files and try to understand > it. tiffinfo will show you the scale and the UL point. As I > understand it there is a hard norm that the tiff is oriented with the y > axis towards grid north for the CRS it is in. > In a map I georeferenced I see tags > > 33550: xscale scale 0 > 33922: 0, 0, 0, UL-east UL-northing, 0 > > or at least that's what think. > > > > > _______________________________________________ > QGIS-User mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >
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