[postgis-users] Define spatial reference system for local datum

[tommy408]

I'm not mapping anything on earth.  The world I'm doing is flat.  The
polygons I'm drawing over is raster image I made.  So I'm trying not to use
any ellipsoid projection.


Suhr, Ralf wrote:
> 
> Do not use a local system. For everything larger than 200meters you need a
> srs definition, because you can't messure it exactly.
> 
> Take a projection from your living area und shift your geometrys to the
> right place.
> 
> -----Ursprüngliche Nachricht-----
> Von: postgis-users-bounces at postgis.refractions.net
> [mailto:postgis-users-bounces at postgis.refractions.net] Im Auftrag von
> tommy408
> Gesendet: Dienstag, 30. Juni 2009 12:26
> An: postgis-users at postgis.refractions.net
> Betreff: [postgis-users] Define spatial reference system for local datum
> 
> 
> 
> I don't need special projection.  My map is a flat plane so I'm trying to
> use local datum as my srs because a bunch of gis map design tool ask for
> it.  
> 
> So I'm trying to add a new srs into postgis spatial_ref_sys table with the
> following srstext
> 
> LOCAL_CS["Non-Earth (Meter)",LOCAL_DATUM["Local Datum",0],UNIT["Meter",
> 1],AXIS["X",EAST],AXIS["Y",NORTH]]
> 
> 
> What do I put for proj4text?
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