Issues in coordinate transformation

[rider on the storm]

Dear All,

I am facing an issue in (as I think) coordinates transformation.
I did a mapping flight with PPK correction of the coordinates. The final model should have been in Gauß-Krüger Zone 3, elevation DHHN92. Converting in Photoscan worked well and as the elevation changes approx 40m I assumed everything was fine. Afterwards I figured out that there is an offset of around 4-5 meters from the model´s coordinates to the coordinates measured in an official model with DHHN92 elevations. So I assume that the cnversion into GK3 doesn´t covnert the elevation into DHHN92. Is that possible? If so, is there any way to convert the elevation into the requested DHHN92?

Thanks and best regards,
Andreas

[imarqs]

Hey Andreas,

I think I'm having a similar problem. I also try to get mapping results in DHHN92. My understanding is that one needs to import the goid model first. To get DHHN heights one needs the "German Combined QuasiGeoid" (GCG). The Geoid can be ordered here:

http://www.geodatenzentrum.de/docpdf/quasigeoid.pdf

Sadly they do not offer the Geoid as a TIF file which is the format Photoscan expects. I was not able to solve this yet.

Were you able to solve your problem Andreas?

Best wishes
Markus

UPDATE: The mentioned source also profides a TXT format, which is readable by Photoscan. This solved my problem and should solve yours.