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1

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

« on: April 03, 2024, 03:51:38 PM »

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

2

General / Import Coordinates for automatically detected markers from file

« on: January 06, 2022, 05:25:39 PM »

Hi guys,

I am currently experimenting on including coded 14-bit markers as GCPs into my UAV-Workflow. The automatic detection works quite good, even if I don't get the exact position I get at least a very good approximation 

All autodetected markers appear as "target X" without any coordinates in the reference pane. In my test i replaced every north, east and elevation value with the coordinates from GNSS-measurements via copy & paste. Is there any way to load the coordinates from a file and replace all "empty" markers at once? Or should I import the reference coordinates first and then run the autodetect?