Používání Drone2Map pouze s pozemními kontrolními body (bez GPS)

Question

Mám sérii fotografií pořízených kamerou bez vestavěného GPS. Místo toho označujeme pozemní kontrolní body a zaznamenáváme jejich polohu pomocí centimetrově přesné TotalStation, které jsou pak spárovány s fotografiemi pro vytvoření vysoce přesného ortomozaiku a DEM. Body z TotalStation jsou obvykle přesnější než GPS dronu pro naši aplikaci (archeologie). Obvykle zpracovávám data tímto způsobem v Agisoft Metashape, kde je snadné říct softwaru, aby ignoroval GPS data a používal pouze importované polohy GCP. Rád bych tento proces zopakoval v Drone2Map, ale nedaří se mi přijít na to, jak použít Drone2Map s obrázky, které nemají inherentní GPS souřadnice. Je vůbec možné to udělat v Drone2Map, nebo mám smůlu? Děkuji za jakoukoli pomoc.

KathrynCatlin2 · Answer

Hi Cody,

Thanks for your answer.  It sounds like Drone2Map won't be appropriate for this application, unfortunately.  We use just a small point-and-shoot Nikon attached to the end of a long pole that we carry across the site, so I doubt it is in your database, and each run of images can have 100 or more photos in it which may not be in an easily-reconstructed "flight plan." Building a table post-hoc for each run is probably too time-consuming.  We will just continue to use Metashape, which can do this natively/automatically!

Kathryn

CodyBinkelheim · Answer

Kathryn

You're correct that your TotalStation control points will be more accurate than a drone's GPS points, but accuracy is only part of the question.  without any relative positioning information, the software won't know if image 77 is north, south, east, or west of image 76.

I haven't actually tested this but you should be able to proceed if you're willing to build a simple table with estimated camera positions - e.g. filename with path, longitude, latitude, altitude (above sea level) should be enough - but that might be a bit tedious.  You can calculate intermediate photo positions if you can estimate start and end positions for the first and last image and the spacing between flightlines.

As noted I haven't tested this so I'm not sure if you can make it work without creating that table.  If you can get the project started, you should get good accuracy with your control points.

The other question is camera - will your camera be in our drone camera database?

https://doc.arcgis.com/en/drone2map/latest/help/edit-camera.htm

Cody B.