Beat me to it! I hiked the Overland Track in January, and recorded a trace of most of it - but the busy getting-back-into-life-after-the-holidays has prevented me from adding it to OSM.
I'll be able to provide confirmation of your track. - Lachlan On Tue, Feb 23, 2010 at 2:49 PM, John Henderson <snow...@gmx.com> wrote: > Steve Bennett wrote: > >> Garmin Oregon 550. > > I see that's got a barometric altimeter too. Very good. > >> Ah. What is "GPS-derived altitude" though, exactly - does it rely on a >> model of the earth's surface, or is it effectively computing the >> distance from the satellites? > > Purely from satellites, definitely. Others on the list are likely much > more up to speed with the technicalities. > >> Anyway, my recorded elevation for Mt Ossa is 1613m, and the Acropolis >> is 1477m. Wikipedia gives Mt Ossa as 1614, and the Acropolis as 1481m. >> Maybe this method is more accurate than I was expecting... >> >> OTOH, I'm still not convinced that all this is necessary. Surely using >> figures from an authoritative source would serve everyone a lot >> better... > > Yes, the figure from a proper survey should have an accuracy of a few > centimetres. One of my many jobs (back in the 70s) was a chainman > (surveyor's assistant). With modern electronic gear, I believe there's > no such job any more. > > John H > > > _______________________________________________ > Talk-au mailing list > Talk-au@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-au > _______________________________________________ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
