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Answer by Lang Zhou for how to get 3d space coordinates from 2d coordinates...
Retrieving the corresponding point of orthomosaic image from point cloud isn’t trivial as it may seem, since in a digital image, what you have is pixel with a ‘location’ represented by row and column...
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I'm having a 2d orthomosaic image and also its point cloud. If I draw a polygon around an object on an image then in the output it should return me the coordinates of that object from 3d point cloud....
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