[OSM-talk] NMEA altitude versa barometric altitude

Richard Fairhurst richard at systemeD.net
Sat Sep 2 20:45:01 BST 2006


Andy wrote:

> Having said that, altitude accuracy just from satellite data (ie no
> barometric or other information) is not a great deal of use anyway due to
> the poor accuracy. There is also free height data available to place
> contours on maps so elevation information is not really critical for OSM at
> this point in time.

Point taken about the accuracy... but theoretically GPS height data  
_could_ be useful. If nodes were tagged with altitude, then bridges  
and tunnels would be a whole load easier to calculate.

cheers
Richard





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