Curtis L. Olson writes:
> The terrain elevation system could stand to be looked at a bit.  I think 
> there is still a lurking bug where the wrong elevation can be returned 
> under some circumstances immediately after a tile boundary is crossed.  
> There are some optimizations in the current system that assume you are 
> reading ground elevation from the same tile or same position stream as 
> before.

My guess is one wants to look closely at the 'in airport', 'on airport border' 
and 'airport crosses tile boundary' cases.


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