[GRASSLIST:2860] Re: Roussilhe Oblique Stereographic

[Paul Kelly]

Hello

Morten Hulden wrote:
> 
> On Sat, 6 Mar 2004 werchowyna at pf.pl wrote:
> 
> > I need to make a mapset in a projection called Roussilhe Projection (alias
> > Quasi-Stereographic) on the Krassovsky ellipsoid, modified Pulkovo 1942
> > datum different than those included in libproj but the datum os not an issue
> > here, I solved it myself
> >
> > the complete system (ellipsoid, datum and projection) is an old, the most
> > popular and widely used system in Poland (called "System 1965" ("Uklad 1965"
> > in Polish))
> >
> > the issue is the projection only - there is no projection called like it in
> > Grass
> >
> > notice: the projection name is my literal translation from Polish; I'm not
> > sure what is the proper name in English though I have met some sound similar
> >
> > any ideas how to apply this projection in Grass?
> 
> I have:
> 
> PROJ_INFO
> 
> name: Transverse Mercator
> datum: S-42
> towgs84: 33.4,-146.6,-76.3,-0.359,-0.053,0.844,-0.84
> proj: tmerc

tmerc is only used in zone V in Poland; for the other 4 zones it should
be
proj: stere
Plenty of information at
http://crs.ifag.de/country_select.php?country=PL
or ask on the PROJ.4 mailing list http://remotesensing.org/proj/

If you have GRASS 5.7 it is much easier to set up projections: try 
g.proj -c proj4='+init=epsg:2171' location=poland1
g.proj -c proj4='+init=epsg:2172' location=poland2

etc. to create new locations with these projections. Should work if you
have PROJ.4 and GDAL installed properly.

Paul