The 3D reconstruction does not preserve the shape of the surveyed area

Error

The 3D reconstruction does not preserve the shape of the surveyed area (bad relative reconstruction).

 

Description

In projects with no image geolocation and no GCPs, it can happen that some of the images do not get positioned relatively correctly leading to bad relative reconstruction. In this case the shapes do not get preserved.

 
Example: A flat area may not get recosntructed as a flat area. Part of the area may have some inclination:

 

not_preserve_shapes.png

blended_point_cloud.png

 

Cause

The cause of the problem is that few points are found between the images. As there is neither image geolocation nor GCPs, it is difficult to find the correct position of the cameras.

 

Solution

In order to solve the issue it is needed to add some Manual Tie Points. For step by step instructions: 202560349.

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