[Proj] datum does not change?
robert-j at gmx.de
Mon Mar 21 16:46:01 EST 2005
On Mon, Mar 21, 2005 at 03:53:58PM -0500, you wrote:
> > Why do I always get the same result? Changing the datum doesn't seem to
> > have an effect on the output? I expect something that is much nearer to
> > "12d10'27.403"E 51d41'38.33"N" than the result below.
> The proj and invproj commands do not utilize datum information. If
> you want to convert locations between two datums you will need
> to use the cs2cs commandline program. The proj and invproj
> programs stick strictly to the projection<->lat/long conversion on the
> stated ellipsoid.
I knew, it was my mistake. All examples used cs2cs because they converted
to UTM and I needed lat/long, so I thought invproj would be best ...
But that leads me to another question: if I use
> invproj +init:epsg=31464
then the datum isn't converted, although EPSG:31467 has the
+datum=potsdam switch? I think, that would be very strange.
So what I want is:
cs2cs +init=epsg:31467 +to +proj=latlong +datum=WGS84
Thank you, Robert
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