On 21/09/2008 13:17, Oliver Eichler wrote: > On Sunday, 21. September 2008 13:41:58 David Earl wrote: >> On 20/09/2008 22:08, Stefan de Konink wrote: >>> I sincerely wonder why anyone in the community would buy a Garmin as >>> tracking device after (s)he is aware that the device doesn't report >>> h-/v-/p-dop. This is even more basic functionality... >> I have no idea what "h-/v-/p-dop" means so it would hardly be a reason >> for me not to buy one! Am I alone in not understanding your acronym? >> >> Mine seems to do the job I bought it for, at competitive price. I wish >> it had one-touch auto-numbered waypoints though. > > It's the horizontal, vertical and positional dilution of a GPS position, due > to satellite position. Without that it's hard to judge the quality of a > track. See wikipedia on "DOP". > > You can derive this information from the almanach later on, but it would be > nice to have it recorded, too. Next to other information like velocity and > heading.
OK, I understand now. But I still don't know what I'd do with the information if I had it. The satellites are where they are when I'm out surveying, there's nothing I can do about the positional accuracy. It's usually pretty obvious when a track has gone wildly off (usually due to woodland cover or urban canyons), and I'm still generally going to use the track otherwise. David _______________________________________________ dev mailing list dev@openstreetmap.org http://lists.openstreetmap.org/listinfo/dev
