I am planning a Double Grid Mission to map a construction site in a city. I am a little concerned that a visual flight will not be possible as there will be buildings between me and the drone. Visual flight is mandatory (eye-to-drone-contact, not just FPV on the monitor).
The idea is to stand on the roof and also start the mission from the roof (about 20 m above ground). When I turn on the drone on the roof it will say it’s at 0 m. If I wanted to run the mission 15 m above the roof top it will be 35 m above ground. Which altitude counts here referring to the flight setup in Pix4DCapture?
When the drone flies over the roof’s edge, will it drop down -20 m or keep the altitude of 15 m from the take off position?
Does anyone understand my question?