[gdal-dev] Re: projection unsupported?

[Christoph Dohmen]

Well, Hermann, not _really_ :-(

The WKT from one of the files is the following:
PROJCS['Kertau_RSO_Malaya_Meters',
              GEOGCS['GCS_Kertau',
                  DATUM['D_Kertau',
                      SPHEROID['Everest_1830_Modified',6377304.063,300.8017]],
                      PRIMEM['Greenwich',0.0],
                      UNIT['Degree',0.0174532925199433]],
                  PROJECTION['Rectified_Skew_Orthomorphic_Natural_Origin'],
                  PARAMETER['False_Easting',804671.299775],
                  PARAMETER['False_Northing',0.0],
                  PARAMETER['Scale_Factor',0.99984],
                  PARAMETER['Azimuth',-36.97420943711801],
                  PARAMETER['Longitude_Of_Center',102.25],
                  PARAMETER['Latitude_Of_Center',4.0],
                  PARAMETER['XY_Plane_Rotation',-36.86989764584402],
                  UNIT['Meter',1.0]]

The difference is the Datum (a=6377304.063 vs. a=6377295.664) and the
false easting (x_0=804671.299775 vs. x_0=804670.24).

The parameters from spatialreference.org define the projection to be
omerc which is not RSO :-(

Christoph

-------- Original-Nachricht --------
> Datum: Wed, 25 Aug 2010 09:09:42 +0200
> Von: Hermann Peifer <peifer at gmx.eu>
> An: Christoph Dohmen <ChDohmen at gmx.de>
> CC: gdal-dev at lists.osgeo.org
> Betreff: Re: projection unsupported?

> 
> It looks to me that "Kertau RSO Malaya Meters" is also known as 
> EPSG:3168. So for the GDAL tools, you could use the EPSG code or this 
> list of parameters and values:
> 
> http://spatialreference.org/ref/epsg/3168/proj4/
> 
> Hermann
> 
> 
> On 25/08/2010 07:35, Christoph Dohmen wrote:
> > Dear list,
> >
> > I got some data to deal with which use a projection called
> > "Kertau RSO Malaya Meters". From some earlier posts to proj.4
> > list I got the information that this is a kind of oblique
> > mercator projection. But I can't find anything around gdal
> > about how to deal with this projection.
> > Do I have to change the SRS before using gdal to deal with
> > this data? Or will there be any change inside gdal to support
> > this projection? Are there any hints outside I didn' get
> > so far?
> >
> > Best regards,
> >
> > Christoph
> 

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