Drone Data Accuracy Part 3: Flight Speed
The accuracy of your data can be significantly affected by how fast you’re flying. Generally, you’ll need to fly slower for better accuracy, and use the highest possible shutter speed and ISO settings on your camera.
A typical fixed-wing drone like the eBee flies at a minimum speed of 11 meters per second, and typically a fast shutter speed is 1/1000th of a second. This means that in the time the shutter is open, your drone will have moved 11/1000ths of a meter — which is 1.1cm.
This movement can cause a very subtle warp/distortion in the whole image, an effect called "rolling shutter," and results in reduced accuracy. Processing tools can try and account for this error. This movement can also cause blur in the image, which heavily affects accuracy.
A good rule of thumb is that to avoid blurry images and rolling shutter, you should use a shutter speed that means your drone has moved less than one third of your GSD. If your camera can only capture at a shutter speed 1/1000th and your drone can’t fly slower than 11m/s, you should plan your flight to capture just over 3.3cm GSD.