[OSM-newbies] Altitude/elevation with OSM and Josm

[Mark Williams]

ael wrote:
> ael wrote:
>> Harald Kirsch wrote:
>>> Am 05.01.2008 10:02 schrieb Mark Williams:
>>>> Harald Kirsch wrote:
>>>>> Am 04.01.2008 23:31 schrieb Mark Williams:
>>>>> Ok, thanks. Which brings me right to the next question. Is there a way
>>>>> to convince JOSM to show altitute values form imported GPX tracks?
>>>> It would be nice to have a plugin that looked for, say, the nearest 10 
>>>> points & took a weighted average altitude - but you then have issues 
>>>> around calibration (my Garmin can easily be 40metres out if the weather 
>>>> changes). I'd love something you could activate for a session, which did 
>>>> this for new nodes.
>>> This sounds like you have a barometer in your GPS, which I have not.
>>> Nevertheless I get altitudes, and I would have thought they are not far
>>> more off than the plane-coordinates, because GPS is "just"
>>> triangulation. But from what you say I assume that the altitude
>>> measurement provided by triangulation is even worse than the 40 metres
>>> off. Is that true?
>> Page 40 of the Garmin "GPSGuideforBeginners_Manual.pdf" (available on
>> their website) has a section:
>> "Satellite Geometry, and why your horizontal location is reported
>> more accurately by your GPS than your elevation (vertical location)"
>> which covers the issue.
> 
> Correction: the manual is "UsingaGarminGPSwithPaperLandMaps_Manual.pdf"
> rather than the Beginner's manual.
> 
> ael

"Yes"

Mark