[OSM-talk] Trace type

[Ed Avis]

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 <eda at waniasset.com>