[Qgis-user] Qgis : how to define Congo 1960 Pointe noire?

[Andre Joost]

Am 03.09.2013 18:09, schrieb image:
> Hello thank you for your reply.
>
> Actually i have to define a projection in qgis with several parameters
> (deltax,y,z, rotx,y,z and delta scale).
>
> I entered this SCR in qgis :
>
> +proj=utm +zone=32 +south +a=6378249.2 +b=6356515
> +towgs84=-178.3,5.278,-316.7,6.077,-131.5,10.979,19.166 +units=m +no_defs
>
> But when i reproject my data with this SCR, there is no transformation.
>
> 1/Can you confirm that those parameters must be entered in this order :
> DeltaX, RotX, DelatY, Roty, Deltaz,rotz,Deltascale?

No, first the deltas, then the rot, and scale last. But have a look at 
the unit of the rot's. According to the manpage:

http://proj.maptools.org/gen_parms.html

they are in seconds of arc, and have inverted sign compared to the 
official data EPSG publishes.



HTH,
André Joost