srbell, thank you for your advice. The project manager changed the plan. Now he wants the images to be taken with a full frame camera such as 5D MarkII or III. This makes my work harder. 5D is almost 1500g with the lens which means I have to set up may be a Hex for it. The setup I am thinking of would carry 5D (no gimbal) probably for 20 or 23 mins at best. Following WKM i have to fly around 29km to cover the 4sqkm mapping. If the speed is 5m/s I can roughly fly one and a half leg with each charge of the battery. I don't know if it would be doable.
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