[postgis-users] Coordinate Transformation using theLongitude_Rotation math transform function

[Bryce Watkins]

My apologies - I should have included more info - this is the contents of
proj4text field:
+proj=longlat +ellps=GRS80

Also output of postgis_full_version():
"POSTGIS="0.9.0" PROJ="Rel. 4.4.9, 29 Oct 2004" USE_STATS DBPROC="0.0.1"
RELPROC="0.0.1""

Cheers,
Bryce.

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
strk at refractions.net
Sent: Monday, 14 February 2005 9:40 p.m.
To: postgis-users at postgis.refractions.net
Subject: Re: [postgis-users] Coordinate Transformation using
theLongitude_Rotation math transform function

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]]]

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