[OSM-talk] augmenting contour data with gps track logs

[Anthony]

On Tue, Dec 29, 2009 at 12:01 AM, Liz <edodd at billiau.net> wrote:

> There are many sources of error in SRTM and GPS and barometric height
> measures.
> First of all
> Height compared to what?
>

WGS84 adjusted by the deviation between WGS84 and EGM96 at the lat/lon of
the measurement?  Would that work?

A fast bicycle descent wrecks the height calculation because the processor
> is
> too slow.
>

Could that be resolved by asking it to output raw WGS84 altitudes and then
doing the calculations to adjust it to MSL offline?

Just questions.  I don't know enough about this stuff to have the answers.
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