> Unfortunately DEM data is *way* too noisy and has too much potential for
> odd artifacts to use directly. What I have done is to take a coarse
Hmm... About what resolution are we talking here?
What additional data do you have available for the runways? I guess you
have it's position (two endpoints? center point, direction, length?)
and ``elevation''? Commonly, the runway elevation at both thresholds
is given in the approach plates, is this data available?
How about the following KISS solution: Do a first- or second-order
approximation of the elevation of the centerline (least squares).
Define the runway using its width, this centerline and no sideways
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