Martin Koppenhoefer <dieterdreist <at> gmail.com> writes:
>>>[ ] barometric elevation data
>>
>>Can't the presence of this data be seen by examining the GPX file to see if
>>there are <ele> sub-elements inside each <trkpt> element?
>but you don't know the source (barometric or gps)
Oh I see. In that case, like geoid undulation, it is better to get the user to
specify the GPS device they used to make the trace. If it's one that has a
barometer, then prompt further:
( ) Altimeter switched off
( ) Altimeter on, but not calibrated recently
( ) Altimeter on and calibrated
( ) Don't know
My device has an altimeter but I rarely calibrate it because I didn't realize
altitude data was that useful for OSM. However, a recent trip to Edinburgh
(where there are lots of streets crossing above each other) has made the
usefulness of 3D map data more apparent.
--
Ed Avis <e...@waniasset.com>
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