That's true about two data points for a rectangle, though radius would take less space than a geo coordinate.I think DJI uses two geometries: circles and rectangles. For most airports its a circle but for more complex shapes they use a rectangle as I listed above. It is likely the space limitations in firmware/storage result in the use of just two geometries. A circle is a lat/lon with a radius and a rectangle is two lat/lon pairs.
Brian
Strange then that a jail isn't square.
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