[OSM-dev] gpx elevation data for given bounding box?

[Tom Hughes]

Stefan de Konink wrote:

> Timo Juhani Lindfors schreef:
 >
>> I can see elevation data. Is there anything I could do to get such
>> elevation data for only specific bounding box? I am not sure how much
>> www.openstreetmap.org likes if I download all GPX files (44 gigabytes
>> if my extrapolation is correct) separately and then do bounding box
>> filtering locally.
> 
> The reason seems to be that some people *think* they are not accurate.

I think the experiment we conducted at the 4th birthday party showed 
pretty conclusively that it's not accurate. We were only about 12 foot 
above sea level (as measured by looking over the wall at the Thames) but
the various GPS units present reported values from about 0 to about 200 
foot or so. They also varied radically over time despite the fact that
we were sat still.

Tom

-- 
Tom Hughes (tom at compton.nu)
http://www.compton.nu/