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Hi! we have a strange deviation in a 3d modelling of cillindric tanks

Hello! we used Pix4D Mapper & Cloud for modelling & viewing

There is not enough texture on the smooth, white walls of the tanks to generate enough tie points for good reconstruction. This is very common with nadir imagery. You could fly some additional oblique imagery of the tanks, which would probably have more texture. You could also try to reduce the number of minimum matches to 2 in step 2.