Hi Hynekel,
Interesting Pix4D says there is a focusing issue.. I found that on 2 of the first in a sequence of images I acquired.. the rest were in focus
For the quarry image above using DroneDeploy I flew at 70m, 16 hectares, about 8 minutes, 3cm/pix GSD . Under advanced>automatic camera setting off (to the left)
Sidelap 60%, frontlap 70% (I think default) with max flight speed at 15m/s.
Rotate the flight direction to be parallel to the longest run the mavic will take. I set the C1 dial to control the shutter speed and adjust before take off and inflight just before image capture takes place
I found with the Automatic Camera Settings selected, the images would be overexposed.
Here is another orthomosaic I did at another quarry map.
Whites Hill Quarry Orthomosaic
The shutter was 1/1000 sec, ISO 100 . Also have WB manual to suit if sunny/cloudy.
In DD, plan the mission on your desktop before you leave and then open your ipad and load/ cache the maps before you go. In the field I use the personal hotspot on my iphone as well
Fly on 100% battery. I should cut and past this 1000 times. The mavic will suck battery power to get to 75m and after the first minute of flight the battery capacity will drop down to 92% or so. This was very disconcerting for for me as I calculated at this rate the mavic would run out of juice. Once the mavic started flying, the battery drain diminished and stabilized.
For the quarry in the
Whites Hill Quarry Orthomosaic link, it was a 8 minute 18 hectares flight and the mavic landed with 38% battery.
Also how is the wind up at 75metres.. who knows but it will have a big impact on mavic performance.
My advice is to do a short run say max 2 mins just get get your confidence up. Once you get experience and can capture images successfully, extend your runs. I also advice to launch from the highest point you plan to map and not the lowest.
Make sure you open DJI go app first and check all the setting there are appropriate set you home point. then close and open DD.
also be prepared to take control of the mavic when it returns to the home position overhead and land it manually
Best wishes