Photo and Point Cloud Match Problem

Hello, I'm Ahn Soonhye uk, working in a company in Korea

I'm leaving a message because of the matching issue between the photo and the point cloud

I work with drones and mirrorless Leica scanners

However, the position of the drone and the position of the scanner are separated and matched due to the level problem

Scan data is e57 and merged data with noise and region already erased

Give them a hand.

  • Hello. Thanks to Mr. Oto, it's getting better

    1. Coordinate systems ae the same but accuracy is not. Without RTK the DJI drone has consumer grade GNSS with accuracy in meters and vertical accuracy is relative(doesn't use GPS at all but takes altitude from barometer). Scanner is more accurate because you set scanner on known location.

    That is why you need to align them using GCPs or align with aerotriangulation

         (I see. I understand for sure that the GPS of the drone is not accurate
          But I know how to put coordinates in a picture using gcp, but I don't know                  how to arrange using gcp
          Could you show me a link or a video of the method?
          I'm sorry for asking so many questions)

    2.  None of your data has real coordinates as I see from video. Photos are from camera without GPS and point clouds are in local coordinates. It even warns you in 3D view that coordinate mismatch is detected.

    If they are not set in same scoordinates you need to create so called fake GCPs and use that. Just read some coordinates from point clouds and use that as Survey points for photos then it will be in same place and can be used for reconstruction. Alignment step adjusting photos to point clouds then won't be needed.

         (Fake gps. I saw it in another community post
          I've read it about five times, but I didn't understand it.
          Can you explain it in detail or record it?
          (How to match photo data without gps data and scan data with fake gps.)
          If you can't upload video data due to capacity,
          Can you send it to ansoonhyeok331@gmail.com)

          You are my savior

  • Not fake GPS but fake GCP(ground control points).

    You simply read any coordinate from point cloud and then use it as Survey point(control point) and input this coordinate and mark it in at least 3 photos. You need to read coordinates from at least 3 points.

  • Thanks to Mr. Otto, we've come this far

    But it's not perfect, but it's a little off. How can I fix this?

    When I turned off the splats, the bent vertex disappeared