Ground Control, Tie Points – Requirements for Structure for Motion
I am being tasked to provide control for a SfM project. Area is remote, hard to reach and we have enough survey grade receivers to allow 2 hour OPUS solutions in the project area. I’m looking for guidance, to achieve 10-20 cm vertical and the spacing for Ground Control to achieve this. We will have some opportunity to premark with panels and some RTK will be available for a short time (via skiffs) for check shots. But due to distances, I’m looking for the spacing I can rely on when the plane is flying overhead, and since were not getting back to this area until the next summer at best, what is the distance between points to tie this down to earth. Our CORS network is very good in this area with typical 20- 70 miles – excellent for Alaska.
Guidance, documents that include tables specific for SfM postprocessing including ground control is what i’m seeking. This is a coastal fringe product, where there is plenty of open sky, but tight time constraints, so planning this effort is falling a bit on my back.
Thanks.
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