Choosing the most appropriate flight direction requires you to consider different parameters. Flying parallel to the longest edge decreases the number of turns, which leads to the minimal flight duration. With this strategy, the maximal coverage can be reached. The most important thing you need to consider when choosing the flight direction is that you plan enough space for the turns so that they do not interfere with any objects close by.
In the case of notable wind, we strongly advise you to fly orthogonally to the wind direction. This way, the front overlap is not being influenced by the wind, and a good reconstruction is ensured. Another method to improve the reconstruction, especially for homogeneous areas, is not to fly aligned with linear structures (such as roads or cultivated fields). This reduces the number of similar looking images. Finally, we recommend flying along a slope rather than in its direction. A waveform of the ground elevation in the altitude graph indicates the latter, while a flat ground with steps at the turnarounds would be ideal.