After scaling a object by importing camera coordinates in the reference pan, I observed the 3D point cloud to be down scaled by a factor of 2 in z-direction. The scaling was perfect in x, and y-direction. Since Z can be affected by the focal length or the photographing height, both were checked and seemed okay. In the camera calibration box, the focal length was appeared as it is and the photographing height was measured from the test object to the front part of the camera lens. How can I correct the scaling in Z direction?