GPSなしで地上制御点のみを使用してDrone2Mapを使う方法

Question

搭載GPSのないカメラで撮影された一連の写真があります。代わりに、地上制御点をマークし、その位置をcm精度のTotalStationで記録し、それらを写真と照合して高精度のオルソモザイクおよびDEMを作成します。TotalStationのポイントは、私たちの用途（考古学）では通常ドローンのGPSよりも正確です。私は通常、このようなデータをAgisoft Metashapeで処理しており、ソフトウェアにGPSデータを無視させてインポートしたGCPの位置のみを使用するよう簡単に指示できます。このプロセスをDrone2Mapで再現したいのですが、GPS座標が元々ない画像でDrone2Mapを使う方法がわかりません。Drone2Mapでこれを行うことは可能でしょうか、それとも無理でしょうか？ご助力いただければ幸いです。 <\/P>

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.