Hi Bentley Communities,
I am reaching out to see if anyone can help with the below problem.
Essentially we are having problems transforming our data sets from WGS84 to MGA2020.
We are capturing photos with a P4 RTK Drone connected to the CORS network for RTK corrections. The P4 RTK Drone collects all the data in WGS84, there is no setting to change projections.
The workflow below is based on previous advice received from Bentley.
2 Run first AT - No control points, on WGS 84, photo positioning metadata ticked on.
When applying the control at this stage in MGA94 + Ausgeoid09 the model comes in very well, and the initial positions before applying the ground control are normally very close to start with.
However, when we change over the gtx file (Geoid) and vert overrides excel sheets in the gdal folder (as advised by Bentley) , restart CC and then try this exact method, we select MDA2020 + Ausgeoid2020. At this stage I ensure that there is only one geoid in the gdal folder as well, as they have the same EPSG code.
The initial coordinate differences before applying control are around 1.5m different (the difference between GDA94 and GDA2020) before we’ve even started.
My understanding is that this should be a straight 7 parameter transformation between coordinate systems, so why is CC not applying this shift?
Essentially, it appears that CC isn’t recognising the GDA2020 transformation from WGS84 to GDA2020 . Is there a parameter file we need to update maybe?
I would be interested to see what other people are doing for MGA2020 and what their workflow is?
Any help would be appreciated,
Jimmy