Uso de Drone2Map solo con puntos de control terrestre (sin GPS)

Question

Tengo una serie de fotos que fueron tomadas con una cámara sin GPS incorporado. En su lugar, marcamos puntos de control terrestre y registramos su ubicación con una estación total con precisión centimétrica, que luego se emparejan con las fotos para producir un ortomosaico y DEM de alta precisión. Los puntos de la estación total suelen ser más precisos que el GPS de un dron para nuestra aplicación (arqueología). Normalmente proceso datos así en Agisoft Metashape, donde es fácil indicarle al software que ignore los datos GPS y solo use las ubicaciones importadas de los GCP. Me gustaría replicar este proceso en Drone2Map, pero no he podido averiguar cómo usar Drone2Map con imágenes que carecen de coordenadas GPS inherentes. ¿Es posible hacer esto en Drone2Map o estoy sin suerte? Gracias por cualquier ayuda.

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

Cody Benkelman · 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.