is there anyone who knows the exact sensor dimensions in mm? I would need to try to perform photogrammetric surveys. thank you so much

Assuming you're referring to the camera CMOS sensor, then according to the DJI specifications it's a 12MP 1/2.3" sensor. In metric measurements that's 6.17mm x 4.56 mm.

Hope this helps.

Alan

Here is the spec of the camera sensor for your reference. Please clarify if you are referring to other sensors.