[Qgis-developer] Wrong reprojection if using different datums?

[Francesco P. Lovergine]

On Mon, Jul 13, 2009 at 09:01:14AM +0200, Paolo Cavallini wrote:
> Agustin Lobo ha scritto:
> > different in both datums? I suspect that proj4 (behind QGIS)
> > is not using the +towgs= field.
> > 
> > Any opinions on this problem?
> 
> Hi Agus.
> I think QGIS is mostly ignoring +twgs parameters. This is the root of
> several bugs, and I think is one of the major issues to be solved.
> Mentioned also in our bug squashing initiative:
> http://www.qgis.org/wiki/Bugs#Projections
> Unfortunately, it did not attract much specific funding jet.
> All the best.

Note that in proj 4.6 it is not more assumed +towgs84=0,0,0 by default,
so that it would result anyway in a wrong datum if +datum or +towgs84
is not explicitly set.

-- 
Francesco P. Lovergine