Hello, I have not had any experience with Drones in Agriculture, but i have experience in monitoring of marine mammals and obtention of orthomosaic in coral reefs; these products are used for the characterization of the submerged landscape at low scale.   the challenges faced were to adjust an appropriate methodology for the implementation of photogrammetry in an aquatic environment.   the salvage of this project is the feasibility in the implementation of drones to obtain data of quick response and at a low cost (compared to data obtained from other remote sensors)