Error in forming a 3D model

The last photo attached is an infrastructure from our site that we have to do a 3D image on. We used a DJI phantom 4 pro Drone to take pictures. It has a 13.2 mm sensor size and a focal length of 20 mm. We flew the drone around the building in circle, increasing the altitude as we reach one full circle each time and took around 430 pictures of the places. However everytime when we input the pictures into ContextCapture, one part of the roof will always overlapped with the original building itself in the software as seen in the 3 pictures we uploaded. The part of the roof always end up in a place/position that is out of the initial placing of the roof. Is there any solution to this problem or does anyone have any idea where we went wrong. Does it have something to do with the geographical coordinates or is it to do with user setting eg control points?

Parents
  • Just trying to understand your flight .. you saying you flew really low and flew an orbit .. then went up and flew a bigger orbit - same centre? And on?

    Not a whole lot of point as I see it - you want to fly overlapping (horizontally) orbits .. So flying at say 30m .. 45 degree gimbal .. that will be about 1cm GSD with your Phantom give or take.

    Fly in a pattern of equilateral triangles .. one orbit at each point of the triangle .. one in the middle .. 60m side for the triangles .. make sense? So the orbits are flown in kind of a triangular mesh pattern.

    If you are just flying this building .. I'd probably do one just outside each corner .. maybe one in the middle each side if you were motivated .. about 45 images per orbit .. about 250 images all up. Should be heaps.

Reply
  • Just trying to understand your flight .. you saying you flew really low and flew an orbit .. then went up and flew a bigger orbit - same centre? And on?

    Not a whole lot of point as I see it - you want to fly overlapping (horizontally) orbits .. So flying at say 30m .. 45 degree gimbal .. that will be about 1cm GSD with your Phantom give or take.

    Fly in a pattern of equilateral triangles .. one orbit at each point of the triangle .. one in the middle .. 60m side for the triangles .. make sense? So the orbits are flown in kind of a triangular mesh pattern.

    If you are just flying this building .. I'd probably do one just outside each corner .. maybe one in the middle each side if you were motivated .. about 45 images per orbit .. about 250 images all up. Should be heaps.

Children
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