I’m using 4.4.12. I had a problem with the thumbnails showing up in order to coordinate the GCP’s. My problem doesn’t have anything to do with needing to change the p4d file in notepad or an error with DJI’s photos.
I performed 3 different flights for this site to test out different survey methods with my Phantom 4 RTK. I did a 3D Photogrammetry flight at 200 ft AGL, and two 2D Photogrammetry flights at 200 ft AGL and 82 ft AGL (the lowest that the program would allow me to go). I had no problem when selecting the points in both 200 ft flights, but suddenly having the problem with the 82 ft flight.
After investigation I found that my localized elevations for my GCP’s (around 350 ft) are above my WGS84 flight elevations (320 ft). I tested my theory by adjusting one of my GCP elevations to below my flight elevation. Sure enough, the thumbnails for that GCP appeared while the others above my flight elevation still don’t. Also, after I marked the adjusted GCP on the photos and I changed the elevation back, the thumbnails still show for that one.
I guess the work around is to give the GCP’s a temporary elevation that is below the flight level and then adjust them back up to their actual elevation after selecting the points in the photos.
The above workaround sort of worked - I got one thumbnail to show up for the remaining GCP’s after lowering their elevation below the flight level. I then tried using the Basic Editor in the GCP/MTP Manager to mark the points on 2 photos each in order to hopefully enable the Automatic Marking feature in the RayCloud Editor. It worked. When I went into the RayCloud Editor all of the marked and unmarked thumbnails showed up when I selected the various GCP’s.