[OSM-talk] db and user statistics update

[Johnny Doe]

--- 80n <80n80n at gmail.com> wrote:
>
> Are lat
> and lon coordinates
> incorrect for someone's street somewhere?  Is the
> distance between two
> points distorted in some way?
> 
The only coordinate system "natural" to GPS
is the cartesian geocentric (X,Y,Z), and it is used
internally by ALL GPS receivers. For example it is 
easy to convince a sirf-based device to provide this
information as output. (X,Y,Z) is usually converted by
the NMEA machinery into (long,lat,h;WGS84)
and the OSM database stores only (long,lat) by
dropping
'h' and implicitely assuming WGS84 datum.
If you are taking the (long,lat) pair with another
datum, the error can be hundreds of meters.



 
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