There are a couple of places in OrthoEngine where I have to specify a minimum and maximum elevation. How does this affect the process?
The approximate elevation helps the matching process by giving it a good first guess at the parallax that it should find between the images. The matching is based on a small tile (area) of imagery. If you don’t give an estimated elevation, it has to assume an elevation of 0. If your ground elevation is significantly different, then the corresponding features from the right and left images might not appear in both of the small tiles, since the location has not been adjusted for the approximate offset due to elevation. So, setting the approximate elevation improves the success rate of the matching, and reduces blunders.
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