Photogrammetry in Malawi

Hi there, I'm keen to use the Pix4D app with a DJI Phantom 2 Vision+ to get aerial photos for development of a DEM of a fault scarp in Malawi.

I have a few concerns which I hope you can address:
- WiFi will be limited, and so will mobile coverage, and caching maps may work it seems for Malawi the maps are very coarse.
- Would I be able to use the free flight mode without a map? Would the app still capture photographs every few metres based on the UAVs GPS, or does it use GPS/Internet on the phone itself to determine when to take a photograph?

I feel flying the UAV manually is the best course of action; however, the DJI doesn't seem to have a very good continuous capture feature. Therefore, would your app be able to take photos every few metres even without a GPS/Mobile Signal on the phone?



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