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

[Sean]

Can you just set the SRID to -1.  What 'map design tool' are you
using?

   Sean

On Jun 30, 3:00 pm, tommy408 <tommytomo... at msn.com> wrote:
> 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-boun... at postgis.refractions.net
> > [mailto:postgis-users-boun... at postgis.refractions.net] Im Auftrag von
> > tommy408
> > Gesendet: Dienstag, 30. Juni 2009 12:26
> > An: postgis-us... 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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