Distinguish helicopters and planes

Helicopters can hover (with a ground speed of 0) and would look much better with a helicopter icon. But how to determine if a flight is a helicopter?

Id #3 | Release: None | Updated: Sep 30 2011 at 7:45 PM by KWB | Created: Sep 30 2011 at 7:44 PM by KWB

Elevations < 0

Elevations over oceans / sea can become < 0. There is no way to decide whether an elevation of e.g. -100m is over land and justified or over sea below MSL. So currently all levels below 0 are estim...

Id #1 | Release: None | Updated: Sep 30 2011 at 2:01 PM by KWB | Created: Sep 30 2011 at 8:50 AM by KWB

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