Problem

You have an area (a city, or just a construction site) photographed and 3MX model completed.

Solution

Take photos of the new area of interest
Ensure the new dataset includes enough photos to generate a good 3D model of the area that has changed.
 

Create a new block (in the same Project as the major area) with the new photos

• Do an aerotriangulation on the new block ensuring that it is correctly georeferenced relative to the initial block (use Ground Control points or derive GCP from the initial scene)

• Create a new reconstruction (of the new changed areas) with the same tiling (SRS, tile size, tiling origin) as the original reconstruction.

• Produce the tiles in 3MX format with the same settings (same SRS, same SRS origin). Ensure that the same parameters are used for the Reconstruction and Production so that the old and new tiles are perfectly matched.

• Replace the old tiles with the new ones in the Production directory 

Note:
Using this method there are likely to be texture discrepancies at the tile limit (due to the capturing being done at different times).

Original Author:

Felix James