At 04:57 PM 9/01/04 +1000, you wrote:
>Hi
>
>Almost all the turnpoint data contained in the various files on the
WorldWide
>Turnpoint Exchange (http://acro.harvard.edu/SOARING/JL/TP/AU.html) does not
>have elevation data. When you have something like a Cambridge 302/303 in
>your cockpit, it's nice to be able to work out final glide and available
>height at your target if your waypoint database supports it (rather than
>having everything in the database located at sea level !).
>
>I have sifted through the 1400+ co-ordinates from Geelong Gliding Club's
>contribution and added elevations to those airfields that appear in ERSA,
but
>I would like to make it as complete as possible with accurate data from
other
>sources.
>
>So let me ask some questions which I hope the combined genius on this list
>can answer
>
>(a) with the airfields listed, are the co-ordinates in these databases from
>ERSA or from some other source/feature (some say terminal building, for
>instance, but many have no specific details) ? As an aside, what marker
>point does ERSA use ? Not being a power pilot with an ERSA to hand, I don't
>know.
>
>(b) how were the airfield elevations not in ERSA obtained ? I am assuming a
>drop-in visit with a handheld GPS.
ERSA uses Aerodrome reference point - not necessarily all that near the
runways.
>
>(c) does anyone else have elevation data for these turnpoints that could be
>used for any of these points to fill in the gaps ?
Try topo maps.
Mike
Borgelt Instruments - manufacturers of quality soaring instruments
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