On Mon, Feb 19, 2018 at 1:54 AM, Poutnik the Wanderer < [email protected]> wrote:
> Yes, it is like that. While barometric method beats GPS one in short term > accuracy and precision, it is vice versa in long term. > > But for the most cases, users do not care about absolute altitude nor > about the profile being tilted along timescale. What they are interested in > is the geometry of profile and the smooth lines. > > And this is, why the barometric altimeter is a superior method for them. > > I've also seen systems for surface navigation that take the geodetic coordinates and obtain elevation from a digital elevation model. If there's an accurate, high-resolution DEM available, that may be the ideal compromise for drivers, hikers and such - they're seldom anywhere but the surface, after all, and it avoids issues with changing weather (for a barometer) and incompatibility of vertical datums (for GPS). I love my wrist altimeter when hiking off-trail in mountains - it lets me use any contour line as a backstop. I probably depend on it too much, but the vegetation around here is usually too dense to allow for sight resection - in fact, on off-trail trips, as often as not, a viewpoint is the goal! -- You received this message because you are subscribed to the Google Groups "Osmand" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
