Large vertical error from RTK images

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dannemannet

• April 23, 2021 15:07

I have a DJI Phantom 4 RTK and have tried the new feature with importing the flight log to set the positions of the images with the individual accuracies for the measurements.

Everything aligns great and looks good, but when exporting I have a vertical difference of around 25 meters. When translating down with the average distance to every GCP I have measured as checks I get a good result of about 2cm.

I have set my project output as the coordinate system I need and in which the GCPs are measured in. The images RTK positions are in another coordinate system so I select this when importing the flight log.

The large difference in height suggests that it may not consider the geoid model is this the case? Or what could cause this?

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  Matej Kuric

  • April 23, 2021 17:28

  Hello,
  
  RealityCapture does not support geoid model, and elevations which are connected to it. To avoid this issue I would recommend converting your heights into a system which uses ellipsoidal model.

   

   

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