Preferable fly in these conditions:
- Fly in calm weather, with no strong wind or wind gusts. Windy weather can result in inaccuracies when determining tower dimensions and in deviations from the planned flight paths. Obstacle avoidance also becomes less reliable.
- Ideally the sun should be near its zenith (i.e. avoid early mornings and late afternoons when the sun is low). During the winter months at high latitudes, it is better to fly on an overcast day with diffuse light. Flying when the sun is low results in harsh light that makes it difficult to set exposure and can cause lens flare. If you cannot avoid capturing in high-contrast conditions, expose so that the brightest parts of the tower are as bright as possible (but without overexposing them). How to set exposure correctly is explained in our capture guides for Scanlink and Mission Planner.
- The weather should be stable. If the weather changes rapidly (sun shining, then disappearing behind cloud, then re-emerging, etc.), the resulting image set will be exposed unevenly. If you must fly, make sure that you set exposure when the sun is out (i.e. not when it is behind clouds), then leave exposure unchanged, even if the sun disappears behind clouds. How to set exposure correctly is explained in our capture guides for Scanlink and Mission Planner.