[osm-professional] Elevation values

[Igor Brejc]

On Mon, Apr 12, 2010 at 5:12 AM, Neil Woodhouse <Neil.Woodhouse at erdas.com>wrote:

> If I use the OSM data how do I know that things are in
> the right place?
>

The quick answer is: you don't. I guess it's a matter of trust, like with
Wikipedia articles. And the trust depends on the particular geo. area: those
with higher number of OSM contributors can usually be trusted more than
those with only one. And it's not just a question of the positional
accuracy, it is also about how can you trust something is tagged accurately
(and I think that's even more difficult problem than the positional
accuracy.

Are stats accumulated for same measured points to determine the reliability?
>

There is something to that effect, but it is probably not very useful for
determining accuracy (for various reasons):
1. The history of an object in OSM database
2. Uploaded GPX traces for the area

Regards,
Igor
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