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Author Topic: DEM Transformation AUSTRIA for RTK Modells  (Read 796 times)

Mdaemon

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DEM Transformation AUSTRIA for RTK Modells
« on: March 18, 2023, 09:42:51 AM »
Good Morning,

I am using Agisoft since 7 years now. First with an German Multikopter, the a Phantom 4 Pro and now a Mavic 3 Enterprise and RTK modul.

Main purpose is surveying of quarries.

Since the beginning I have a Trimble R6 Rover, using the austrian apos correktion data. Works pretty well.
The austrian Grid (EPSG: MGI 31255 or 31256) need a local correction on the trimble rover. That means, Fixpoint are measured and there has to be a local correction on the survey controller.

This can not be applied on the Mavic RTK system. Therefor there is a deviation between the GCPs (measured by Trimble) and the RTK Model.

Difference can bei:
X = -0,02 m
Y = 0,64 m
Z = 2,34 m (actual values from this week).

Now the question:
- If I use the GCPs on the RTK Modell, the overall deviation is about 0,10 m, but the modell difference on height ist stll to much.

- Is there a funktion to get the DEM and Ortho modified by these values?

regards
Martin

Kiesel

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Re: DEM Transformation AUSTRIA for RTK Modells
« Reply #1 on: March 20, 2023, 09:48:40 AM »
Hallo Mdaemon,

what about disabling reference for your pictures after alignment and optimise with GCPs only?


regards

Kiesel

Mdaemon

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Re: DEM Transformation AUSTRIA for RTK Modells
« Reply #2 on: March 21, 2023, 11:05:10 AM »
good morning Kiesel,

yes, that works good. But then, the money spent for the RTK Mode of the Mavic 3 E was frustrated.
My optimum would be using the RTK Mode, having 3 - 5 GCPs (usally i use 2-3 pcs per Hektar), calculate the deviation and transform the modell (using x,y,z movement, if the area is not too big)

that would have been the easiest way.
Unfortunately i have not found a possibility to do so in Agisoft and QGIS.
iT WORKS on Bricscad, but  the way is alittle bit complicated.

regards
Martin

olihar

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Re: DEM Transformation AUSTRIA for RTK Modells
« Reply #3 on: March 21, 2023, 01:17:16 PM »
You need to project the Mavic 3E cordinates into the GEOid you are using.