[Proj] GDM2000 for Malaysia

[Bjørn Krangnes]

Frank,

Thank you, that was the solution !

Regards

Bjørn
> Bjørn Krangnes wrote:
>> I have now been looking at this again and my findings are that the
>> program
>> cs2cs is working correct while using gdal in a c# enviroment gives
>> problems. Without the use3 of no_uoff and rot_conv both programs gives
>> the
>>  same result:
>> ** cs2cs
>> cs2cs +proj=longlat +ellps=GRS80 +no_defs +to +proj=omerc +
>> lat_0=4 +lonc=102.25 +alpha=323.0257964666666 +k=0.99984 +x_0=804671
>> +y_0=0 +ellps=GRS80 +units=m +no_defs
>> 103.64025987222223 1.827764875
>> 959373.97       -240050.80 0.000
>>
>> **gdal
>> inn = inpGDM2000.ImportFromProj4("+proj=longlat +ellps=GRS80 +no_defs
>> <>");
>> out = outRSO.ImportFromProj4("+proj=omerc +lat_0=4 +lonc=102.25
>> +alpha=323.0257964666666 +k=0.99984 +x_0=804671 +y_0=0 +ellps=GRS80
>> +units=m +no_defs <>")
>> 959373.969 -240050.800
>>
>> with no_uoff and rot_conv option
>> ** cs2cs
>> cs2cs +proj=longlat +ellps=GRS80 +no_defs +to +proj=omerc +
>> lat_0=4 +lonc=102.25 +alpha=323.0257964666666 +k=0.99984 +x_0=804671
>> +y_0=0 +ell ps=GRS80 +units=m +no_uoff +rot_conv +no_defs
>> 103.64025987222223 1.827764875
>> 627096.13       202122.06 0.000
>>
>> **gdal
>> inn = inpGDM2000.ImportFromProj4("+proj=longlat +ellps=GRS80 +no_defs
>> <>");
>> out = outRSO.ImportFromProj4("+proj=omerc +lat_0=4 +lonc=102.25
>> +alpha=323.0257964666666 +k=0.99984 +x_0=804671 +y_0=0 +ellps=GRS80
>> +units=m +no_uoff +rot_conv +no_defs <>")
>> 959373.969 -240050.800
>>
>> It looks that the +no_uoff +rot_conv is not used in the gdal enviroment
>
> Bjørn,
>
> If you add the +wktext flag to the string passed to ImportFromProj4(),
> then the OGRSpatialReference code will capture a literal copy of
> the PROJ.4 parameters in the internal representation.  I think you
> will need this.
>
> Normally the coordinate system is converted to an internal (OGC WKT)
> representation which does not include exotic parameters such as
> +no_uoff, and +rot_conv.
>
> You would need at least GDAL/OGR 1.4.x for this feature.
>
> Best regards,
>
> --
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam,
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | President OSGeo, http://osgeo.org
>
> _______________________________________________
> Proj mailing list
> Proj at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj
>


Bjørn Krangnes
Devonor AS
Telephone: +47 32 29 96 90
Direct Line: +47 32 29 96 91
Mobile: +47 45035640
E-mail: bkr at devonor.com
Web: www.devonor.com