Photogrametry/survey UAV

Greetings to everyone.

I'm looking for a new project to employ myself after nearly 3 years of unemployment. Talking with some people I think I saw something that I can do, but after a week of searching info I have bits and pieces but can't put together the whole picture. If you could help, it will be greatly appreciated and If anyone is willing to see this to the end, I'm willing to pay.


I would like to "DIY" a UAV for measuring terrains (inheritances, architectural projects...), photogrammetry (volumes for minery...) and photograph (promotional photos/videos for real estate ads and owners). A "jack of all trades" if you will as I don't think what will be more useful.

I think I have to use a +20Mp camera, a gimbal with 3 axis stabilization, a RTK GPS with a ground base for accuracy (2-3cm acceptable), and +20mins flying times.

I was thinking about a hexacopter, with 50% power to hover and the rest for the stabilization in windy conditions and in case of failure. To be honest, don't know where to start with the components. Can you help me with:

1) Size of the frame and good frames for that size. (+650?)
2) Motors, ESC, batteríes and props for the latter. (+40xx motors with 40A ESC and 10000mah 6S?)
3) Telemetry. (3RD 433mhz?)

4) What GPS? Base on the ground and a rover on the UAV? Can it also be used to hold position?
5) Pixhawk 2 with Ardupilot and Mission Planner. Any other hardware/software that you think is better?
6) Camera will be a Sony A6000, is it OK for this?. What gimbal? What camera trigger (Seagull #MAP2?)

7) I use a Taranis X9D and since here in Spain we can't fly +500m, the 2.4Ghz receiver should be enough. Am I right?

8) Need for a powerful ground station or a simple laptop will do?

The budget is around 3000€. Would it be enough? I'm ready to put the time learning to measure, photograph etc, but maybe I'm reaching for more than I can grasp.

I'm not totally useless with electronics but I'm used to FPV mini quads. So I'm totally lost here.


Thanks in advance.

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