Curtis L. Olson writes:

 > For what it's worth, when I was looking into this, I found some
 > examples of runways with their ends literally at least 100' different
 > in elevation.  Most aren't nearly that far off, but there are a
 > few.

For a 10,000 ft runway, that would require less than a 1% continuous
grade, so it's not all that surprising.

It will be a very good thing when we can take threshold elevations
from FAA and DAFIF data.  The SRTM/DEM data, however, is just too
coarse -- that's why I'm suggesting flattening for now.


All the best,


David

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