[postgis-users] Coordinate Transformation using the Longitude_Rotation math transform function

[strk at refractions.net]

On Mon, Feb 14, 2005 at 08:58:54PM +1300, Bryce Watkins wrote:
> Hi folks - has anyone tried this, and or am I even heading in the right
> direction here?
>  
> The problem is that we have a dataset that has been longitude geometry
> shifted by 160 degrees to get around the problem of trying to project
> geometries either side of 180 degree longitude where they exist in the same
> SRID.
> We want to see this data in the correct format, so I have created an SRID
> that uses a FITTED_CS and a PARAM_MT to try to compensate (as shown below).
> I have gotten most of this info from the OpenGIS Implementation
> Specification: Coordinate Transformation Services document on the OpenGIS
> website.  However this doesn't appear to work and am wondering if somebody
> can shed some light on the problem.
>  
> Thanks in advance,
> Bryce.

Postgis requires the proj4text field to be filled.
--strk;

>  
> srtext field in spatial_ref_sys:
> FITTED_CS["FM_MOD", PARAM_MT["Longitude_Rotation", PARAMETER["dim", "2"],
> PARAMETER["rotation", "160"]],
> GEOGCS["GCS_NZGD_2000",DATUM["D_NZGD_2000",SPHEROID["GRS_1980",6378137,298.2
> 57222101]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]]

> _______________________________________________
> postgis-users mailing list
> postgis-users at postgis.refractions.net
> http://postgis.refractions.net/mailman/listinfo/postgis-users