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

[Stefan de Konink]

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Tom Hughes schreef:
> 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.

Documentation for this experiment can be found where?


Stefan
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