Yes, CC supports obliques with GCPs. Ideally, CC works best with nadir and obliques combined. I've made runs with solely nadir or solely obliques, and the results were OK, not great. Try running a test area with only your obliques and see what results you get. What kind of overlap do you have with your obliques--are they random shots, or are they overlapping? CC suggests 60% overlap for obliques and 80% forward overlap/60% lateral overlap for nadir.
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