J'ai effectivement téléchargé le fichiers des altitudes, il semble que l'écart d'altitude s'est très sérieusement réduit et qu'il soit maintenant très proche de la réalité. Merci.
I did download the elevation file, it looks like the elevation gap has narrowed very seriously and is now very close to reality. Thank you. Le dimanche 27 juin 2021 à 16:11:56 UTC+2, Greg Troxel a écrit : > > GOUPIL 30101 <[email protected]> writes: > > > Hello, have you also observed altitude errors of the order of 40 to 50 > > meters in addition to the actual altitude? Did you manage to correct > this? > > Cordially. > > This is complicated: > > The android location API returns "height above ellipsoid (HAE)" which > is not what people call altitude. > > osmand is just a client using your phone's GPS (GNSS) receiver. > First figure out if the phone is ok. Install GPSTest which will show > "Height Above Ellipsoid" labeled, somewhat confusing, as "Alt", and > "WGS84 Orthometric Height", which is very close to what people mean by > altitude as "Alt (MSL)". You will notice that they are different. > > To look up the difference between HAE and WGS84 Orthometric Height, > see > https://geographiclib.sourceforge.io/cgi-bin/GeoidEval > > osmand has a downloadable map called world altitude correction. > Without it, osmand displays HAE, and with it, WGS84 Orthometric > Height, which is effectively a global definition of altitude. > Make sure you have this installed. > > You would be correct to say that this is all unfortunate. That the > complexity exists is unavoidable, but that you are having to deal with > it is because of the choices made in writing the Android API. > -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/osmand/4641110f-89c6-40bb-86be-71b7f34c2597n%40googlegroups.com.
