• Recommended number of control points - control point density

    I'm desperately searching for a page I've recently seen on the forum (or was it the Wiki?), describing the maths and process on how to determine a good distance between GCP;s on a large land survey project. - Is there anyone out there who know what…

  • About limit to zoom in to pixel size to measure GCPs for the Large Format Aerial Images

    Hello CC community, When solving AT, it is difficult to measure GCPs for the Large Format Aerial Images. Drone images are zoomed in to pixel size to measure GCPs. But I have trouble to measure GCPs to solve AT for the Large format images as IGI…

  • GCP Error & KML Constraint Fix

    Hello all, After a lot of trial and error, we managed to produce a 1.2sq km model of Downtown Dubai but we still face a couple of challenges with regards to GCP's and using the KML Polygon for the water surface as you can see below. During the AT…

  • How to use a tie-point as a GCP?

    I have collected geo-referenced drone data along with some SONY DSLR ground photos for a Proof of Concept job on an interchange. I have been trying to use the ground photos to improve the billboard signs along the interchange which have 'holes' in them…
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