View from 400' How much area?

[lookout]

I'm late to this discussion, but this video shows that Pix4d mapping software can adjust the overlapping % when it maps the flight (at 2 min 18 sec of video. Even if you don't use this software to fly the mission, you can use it as a planning tool to get an idea of how many photos you will need, which it seems like what you are after.

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The wingtra is a flying wing drone that lands and takeoffs from its tail. It can map for an hour as compared to a 20 minute DJI. And it flies to get all the squares in.

 

[MS Coast]

Have you considered something like Mission Planner? It calculates optimum routes to obtain coverage based on altitude and camera characteristics. And you can use the output to create Litchi missions.

Mission Planner Overview — Mission Planner documentation

ardupilot.org