[GRASSLIST:6803] Re: cs2cs and grass

[Paul Kelly]

Francesco Mirabella wrote:
[...]
> 
> Just to check,
> I tried to project the point from WGS84 to Gauss Boaga using cs2cs:
> ------------------------
>  cs2cs -E +proj=latlong  +datum=WGS84 +to +proj=tmerc +lon_0=15
>   +k=0.9996 +x_0=2520000 +ellps=intl  -v -f %.6f
> ------------------------
> 
> 
> After importing the point of check into the Gauss Boaga location, it
> results to be shifted about 167 m (mainly to the North) with respect to
> the point project (v.proj).
> 
> where am I wrong? can anyone help??

Looks like you left +towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68 
out of the PROJ.4 description of the rome40 location, so the datum shift 
will not have happened there. Probably the GRASS result is the correct one?