[GRASS5] [bug #3630] (grass) error in v.proj/r.proj in gnomonic projection

[Paul Kelly via RT]

According to the output of the "proj -lP" command:
gnom : Gnomonic
        Azi, Sph.
gnomonic projection can only be used with a spherical earth model. So you 
are going to get undefined behaviour / errors if re-projecting between an 
ellipsoid and a sphere.

Unfortunately I don't know enough to be able to explain it any better than 
that.

One last thing you could try to get the results you want would be to add the 
line
towgs84: 0,0,0
to both the PROJ_INFO files for your two locations you are re-projecting 
from/to, before running v.proj. It might fool PROJ into doing some extra 
ellipsoid/sphere conversions; I don't know.


-------------------------------------------- Managed by Request Tracker