PPK for the Multispectral bands on the DJI Mavic 3M

[mhnewton]

Hi,

I recently got a Mavic 3M, and use PPK with a non-DJI GNSS base station for the RGB camera which works normally as expected.

I then had the idea of applying the PPK to the multispectral bands by creating a simple python script that took the PPK csv file from the RGB images, copied the coordinates and accuracy, and applied to each of the 4 multispectral bands. So now instead of having the csv with 1 row per camera, I have 4 (1 for each band).

I would have assumed if I "Import Reference Data from File" it would have seen the name of each band and apply the PPK information... but it doesnt seem to be recognizing it
Is there something I have to do differently when using a multi-camera system?

Cheers

[Alexey Pasumansky]

Hello mhnewton,

For multicamera system only the coordinates of the master sensor are loaded to the Reference pane, whereas the positions of the slave bands are defined relatively to the master sensor (see Camera Calibration dialog -> Slave Offsets tab).

If you would like to import EO parameters for each band, then you should add all the images as independent cameras (i.e. not use multicamera system approach) and for orthomosaic generation use only one set of images (per band) at a time to get multiple orthomosaics - one per band. In such case they should be merged in the external application, as current version of Metashape does not allow to merge single-band orthomosaics into multiband raster.