[Marble-devel] altitude profiles

[Niko Sams]

Hi,

> Maybe http://wiki.openstreetmap.org/wiki/Route_altitude_profiles_SRTM
> is helpful.
yeah - I used already that download script - the other stuff is using
an sql server - so
no option for us (only if there would be open servers available)

> A server which provides altitudes for a given point (or list of points)
> is http://www.geonames.org/export/web-services.html
> (under "Elevation"). However, maximally only 20 points per request
> are allowed.
> Eg.: http://ws.geonames.org/astergdem?lats=50.01,51.01&lngs=10.2,11.2
hmm, 20 points is not that much - I guess they don't like it if we do
mass requests

> In some mailinglist I found the remark, that
> via the  Generic Mapping Tools one can generate
> a height profile to a track by
>  grdtrack track.txt -Gsrtm.grd > data.txt
> (but I haven't used this myself)
> Maybe some of the tools/code could be (re-)used.
>
> For results from routing services it might be necessary
> to add additional points along longer straight line
> segments, where the altitude might change in between.
thanks for that input.

Niko