Hello Otto, For the sample area under processing, I only used 3 GCP's and they were staggered across the site. The photos and positions were captured with Drones. For the entire stretch to be surveyed we decided on 10 GCP's well spread around the corners and through the alignment of a highway corridor under construction (as depicted in the image below). The entire stretch is 15kms. Based on your experience, how many GCP's would you suggest we install to get an accuracy of 2-3cm and for ContextCapture to easily process as well?
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