The model appears to be curved instead of being horizontal after AT

	Product(s):	ContextCapture
	Version(s):	N\A
	Environment:	N\A
	Area:	N/A
	Subarea:	N\A

Problem Description

You acquired a nadir aerial dataset and did not led a specific calibration step

You submitted an AT, the distortion parameters were computed and your photogroup oriented, but the result is not satisfying.
On that kind of dataset we often observe the same spherical deformation due to distortion parameters
inaccuracy.

Steps to Resolve

To avoid this problem, we recommend the following:

Capture a small dataset of any object with the same camera
Process an AT on this dataset by keeping the default settings
Export the optical properties of the aero-triangulated photogroup
Import these optical parameters in your "UAV-photogroup"
Submit an AT and make sure to set the distortion parameters on "Keep" instead of "Adjust"
The process will take advantage from these more accurate parameters and avoid the spherical effect.

Export optical properties

Your camera distortion parameters are unknown
Submitting an AT will provide you these parameters
You can export them as an *.opt file by right-clicking on you aero-triangulated photogroup

Import optical properties

You led a camera calibration, and you know accurately your camera's distortion parameters
You can import them as an *.opt file by right-clicking on your photogroup, before submitting the AT