offset for z coordinate in maps

Development World Creation
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1

How can I add an offset to the z coordinate on a map to correct the ellipsoidal height captured by a drone? Without GCP’s. I use an RTK module.

2

Hello @Rico195786
You can create your own GCPs on the created mesh and rewrite the actual Z values to a wanted ones.

3

Thanks for responding, I’m new to RealityCapture, is there a tutorial video on how to do that?

4

I don’t think there is an exact tutorial to do so.
You can take some ideas from:

But basically:

  • import images (check if you have set Project and Output coordinate settings properly in the application settings)
  • align
  • place control points (https://www.youtube.com/watch?v=S00_mLfbx6o)
  • change the control point’s type to Ground control (you need to use at least three GCPs)
    image
  • copy actual X and Y values to the selected GCP
    image
  • set the wanted Z value for GCP
  • align again
5

Thanks for your help.

6

I think I’m missing a step. I’m using a job that I shot check points for, so I’m using the markers to set the GCP’s. After I import the photos, align, set the GCP’s and realign the project the Actual Altitude changes, but not to what I set it to. See image 1. Image 2 is the tiff opened in Virtual Surveyor showing the altitude at the Actual Altitude instead of the 407 meters I set it at. Thanks for your help.

alt change in actual

VS showing wrong altitude
VS showing wrong altitude1874×602 63.2 KB

7

Hi, try to turn off the camera prior poses and then align again. Or try to set the higher weight for the GCPs.