Error while editing imported DTM || bridge modelling for orthofoto in general

[Ketzerisch]

Hello all together,

I got problems modelling my DTM/DEM properly for orthophoto generation in the area of bridges. Here a short description of my workflow:

1. flight with LiDAR and RGB
2. Process LiDAR (strip adjustment and classification)
3. Do foto aligmment in metashape and control georeferencing via gcp
4. Import DTM as tif / Import DTM as a pointcloud (tried both, same error)
5. Edit DTM to kick out false classified points and clean up bridge areas

While trying to perform step 5 and using some kind of interpolation method I get the following Mistake "Vertical Datum ouf of range",  a normal fill with a fixed height however works...
All my Data (trajectory, GCPs, DTM/pointcloud) is in UTM32 (EPSG:25832) with geoid heights (GCG2016)

for the general part:
How to do handle bridges in Orthofotos?
Do you edit the point cloud?
Do you edit the DEM/DTM with brakelines?
Do you insert Brakelines as lines/shapes?

Im looking forward to hear your ideas

[Alexey Pasumansky]

Hello Ketzerisch,

Can you please specify, what coordinate systems are defined for chunk, cameras and markers in the Reference pane settings dialog and what systems, according to the Chunk Info, are assigned to shapes, dense cloud, DEM and orthomosaic?

I would assume that something wrong is either with the coordinate system of the imported DEM (incorrectly selected in the Import DEM dialog or default selection is custom and does not correspond to any EPSG system), or with the drawn shapes, that also do not correspond to the actual coordinate system.

[Ketzerisch]

All coordinate systems are defined the same way (25832), and the normal workflow finishes without any error.

I tried to edit the DEM within Metashape itself with the draw polygon/draw line feature.