[GRASS-dev] S-JTSK strikes back

[Paul Kelly]

Hello Martin

On Fri, 4 May 2007, Martin Landa wrote:

>> information (the alpha value) is lost when converting from GRASS format
>> back to WKT. Is this important? I don't know anyway how important alpha
>> and pseudo standard parallel are. Are they important for proj=krovak or
>> does it just ignore it? It seems alpha corresonds to Azimuth in the WKT and
>> OSRImportFromProj4() isn't converting it properly, but I really don't know
>> how important it is for proj=krovak so wouldn't like to get too deeply
>> involved there... Likewise for Pseudo_Standard_Parallel_1 and
>> OSRExportToProj4().
>
> Latitude of pseudo standard parallel (78d30m) is hard-coded in
> PJ_krovak.c and alpha I guess is ignored.

OK thanks for clearing this up a bit. So it isn't a big problem then. Just 
a bit messy.

> I see problem using g.proj epsg=2065 -p / -w :
>
> PRIMEM["ferro",-17.666666666668]
> PARAMETER["longitude_of_center",24.833333333332], <- not Ferro, but Greenwich

Yes this is the problem we came across before. It is currently the subject 
of a pending bug report in OGR: http://trac.osgeo.org/gdal/ticket/367

Paul

> x
> pm         : ferro
> lon_0      : 42.5 <- OK
>
> Martin
>
>> 
>> Paul
>> 
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>
>
> -- 
> Martin Landa <landa.martin at gmail.com> * http://gama.fsv.cvut.cz/~landa *
>