Regardless of which drone you fly or how many GCPs you use, you can improve the product quality by flying curved flight lines. Google "Gently Curved, Convergent, Non-traditional Drone Flight Paths" for a description of the curved flight lines. Justification for flying curved flight lines can be found in the following research: Minimising systematic error surfaces in digital elevation models using oblique convergent imagery Rene Wackrow Jim H. Chandler First published: 16 March 2011 https://doi.org/10.1111/j.1477-9730.2011.00623.x Results of the simulation process, the laboratory test and the practical test are reported in this paper and demonstrate that an oblique convergent image configuration eradicates the systematic error surfaces which result from inaccurate lens distortion parameters. This approach is significant because by removing the need for an accurate lens model it effectively improves the accuracies of digital surface representations derived using consumer‐grade digital cameras. Carefully selected image configurations could therefore provide new opportunities for improving the quality of photogrammetrically acquired data. I hope this information is helpful. Jim Dow
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