[gdal-dev] Re: gdal_rasterize 1.8.0 options

[Maciej Sieczka]

W dniu 05.02.2011 14:47, Hermann Peifer pisze:
> On 05/02/2011 13:12, Even Rouault wrote:

>> I've just had a look, but not being neither Dutch nor a specialist
>> of (stereographic) projections, I don't feel competent enough to do
>> any action on it. Those tickets plus the reading of
>> http://udig.refractions.net/files/docs/api-
>> geotools/org/geotools/referencing/operation/projection/Stereographic.html
>>  make me deeply confused and wondering if r21627 was really
>> appropriate.

> Hmm. This page confirms what I mentioned in ticket #2869:
> "Double_Stereographic" is simply the ESRI alias of
> "Oblique_Stereographic" (EPSG code 9809).
>
> About r21627: I am afraid I do not understand enough about the inner
>  workings of GDAL/OGR to make a judgement about whether this change
> was appropriate or not.
>
> But by the end of the day and from what I remember when looking
> somewhat deeper into the issue, about 2 years ago: there is one
> stereographic projection (known as "the USGS formula" or "the
> approach given by Snyder") which translates into +proj=stere, and
> there is the other "Double_Stereographic", aka
> "Oblique_Stereographic" which is expected to end up as +proj=sterea.

I'm not an expert too, but Hermann findings are in accordance with my
findings for Polish stereographic CRS (from over 5 years ago):

http://lists.maptools.org/pipermail/proj/2005-March/001524.html

The Polish CRSs which use +proj=sterea version of stereographic are
3120, 2172-2174, 3328.

See also Gerald Evendeen's notes:

http://lists.maptools.org/pipermail/proj/2005-March/001526.html

Maciek

-- 
Maciej Sieczka
http://www.sieczka.org