Thank you for your help Sean and Ralf. When I load polygon table with srid of -1, Udig keeps saying undefined spatial reference...unexpected behavior might occur...etc. And when I try to edit the layer, the layer constantly flashing and Udig crashes.
Sean Fulton wrote: > > I'm not sure why you want to assign it an SRS of EPSG:4326. > > uDig will load and Quantum GIS will happily load and edit the layers if > you assign an SRID of -1. > > > Sean > > > On 2009-07-01 16:36:44 -0400, tommy408 <[email protected]> said: > >> >> A lot of these tools that connect to postigs db requires a srid. I was >> trying out Udig. I don't need to use these tools. I can just work with >> shapefile and import it to postgis. >> >> But what I'm worry about is if I use a defined srid like EPSG:4326 and my >> personal map coordinates will mess up because of the projection. The >> world >> I'm mapping is flat and endless, it doesn't wrap around like earth map. >> >> >> >> >> Sean Fulton wrote: >>> >>> Can you just set the SRID to -1. What 'map design tool' are you >>> using? >>> >>> Sean >>> >>> On Jun 30, 3:00 pm, tommy408 <[email protected]> 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: [email protected] >>>>> [mailto:[email protected]] Im Auftrag von >>>>> tommy408 >>>>> Gesendet: Dienstag, 30. Juni 2009 12:26 >>>>> An: [email protected] >>>>> 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? >>>>> -- >>>>> View this message in context: >>>>> http://www.nabble.com/Define-spatial-reference-system-for-local-datum... >>>>> Sent from the PostGIS - User mailing list archive at Nabble.com. >>>> >>>>> _______________________________________________ >>>>> postgis-users mailing list [email protected] >>>>> http://postgis.refractions.net/mailman/listinfo/postgis-users >>>>> _______________________________________________ >>>>> postgis-users mailing list >>>>> [email protected] >>>>> http://postgis.refractions.net/mailman/listinfo/postgis-users >>>> >>>> -- >>>> View this message in >>>> context:http://www.nabble.com/Define-spatial-reference-system-for-local-datum... > Sent >>>> >>>> from the PostGIS - User mailing list archive at Nabble.com. >>>> >>>> _______________________________________________ >>>> postgis-users mailing list >>>> [email protected]http://postgis.refractions.net/mailman/listinfo/postgis-users > _______________________________________________ > postgis-users >>>> >>> mailing list >>> [email protected] >>> http://postgis.refractions.net/mailman/listinfo/postgis-users > > > > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > > -- View this message in context: http://www.nabble.com/Define-spatial-reference-system-for-local-datum-tp24269524p24341214.html Sent from the PostGIS - User mailing list archive at Nabble.com. _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
