An ongoing project I'm working on is to periodically fly and map a road construction project and compare sequential ground surface clouds to track changes/etc. This is being done with photogrammetry only, no LIDAR, and nadir-only photos with about 80% overlap. I flew last month and established a surface that checked well with ground control points. I flew for the second time last week, but when comparing the surfaces there is one area that isn't matching well, and I know that no work has been done there yet. On the attached photo it is the area in orange (orange is about 2 feet of cloud-to-mesh distance on the current scale). The land adjacent to the road in that area is open dirt/wetlands. I have drawn the approximate locations of my current ground control with red boxes.
Would adding ground control adjacent to the orange area help with the photo alignment and surface generation for future flights? If not, what other methods might help with that?