[OSM-dev] Altitude data & (cycle) route profiles

[Robert Vollmert]

On Mar 31, 2008, at 12:00, Andy Robinson (blackadder) wrote:
> Also as a civil engineer I can see some merit in having elevation  
> data for
> physical objects in the database. However, we don't really have a  
> good way
> of collecting data that is remotely accurate to the level at which  
> it would
> be significantly useful. Non survey grade GPS just doesn't cut  
> muster for
> height data so we should never rely upon that. Even the Ordnance  
> Survey
> doesn't currently record height data from survey grade GPS.

Not sure how common they are, but there's some GPS units with built-in  
barometer (Garmin Etrex Vista HCX at least). The data they provide  
should be good enough to be useful.

Cheers
Robert