Ah, you are looking for this: http://postgis.refractions.net/docs/ST_Transform.html
So you need to cast your object as a polygon, set the SRID to your projected coordinate system (I'm just guessing SRID=29181 for your example http://spatialreference.org/ref/epsg/29181/ .. look up the SRID for your original data). Then it can be transformed into long/lat coords: SELECT ST_Transform(ST_SetSRID('BOX(743295.3125 7182512.5,744414.75 7183817.5)'::box2d::geometry, 29181), 4326); -Mike On 26 October 2010 20:01, Wagner Santos <wagner.des...@gmail.com> wrote: > Mike, > Yes, I mean georeferenced (sorry for my English). I made a cast to text and > converted to postgis geometry, but I couldn't use ST_SetSRID. > I would like to tranfer a polygon to correct position. I have a > Polygon "BOX(743295.3125 7182512.5,744414.75 7183817.5)" and I like to > transfer it to "BOX(-54.515022277832 -25.4530487060547,-54.5029907226562 > -25.4447135925293)". > I tried ST_Affine but I don't know the correct parameters, I tried ST_Scale > but I had the same problem. My idea was transform and set srid. > > On Tue, Oct 26, 2010 at 11:44 PM, Mike Toews <mwto...@gmail.com> wrote: >> >> Hi Wagner, >> >> I'm not sure what you mean by "geo" and "non-geo" .. you mean >> georeferenced, like longitude/latitude? >> >> For points, you can keep thing binary and just use ST_MakePoint(x,y). >> And to assign a coordinate system, use it with ST_SetSRID: >> >> SELECT ST_SetSRID(ST_MakePoint(p[0], p[1]), 4326) >> from ( >> select point '(-123.112793, 49.246293)' as p >> ) as foo; >> >> I'm not sure how to do similar binary conversions for path and >> polygon, or other types. You might have to cast to text, and wrangle >> it into some form of WKT, then pass it to ST_SetSRID(text, integer) to >> make a geometry object for PostGIS. >> >> -Mike >> >> >> On 26 October 2010 18:17, Wagner Santos <wagner.des...@gmail.com> wrote: >> > I created a Postgis Geometry from Postgres Polygon converting them from >> > string and using linefromtext to create a geometry but this information >> > isn't geo. >> > I have non geo points and I want to convert to my correct position and >> > set >> > SRID, for example P(70 72) to P(-54 -25), how can I do this? >> > Thanks! >> > >> > On Tue, Oct 26, 2010 at 1:18 PM, Wagner Santos <wagner.des...@gmail.com> >> > wrote: >> >> >> >> Hello, >> >> I'm new with postgis and I have a legacy database with Postgres >> >> Polygon, I >> >> want to convert this to a Postgis Geometry. Is there a way? >> >> I try to do with replace string and linefromtext with sucess, but I >> >> think >> >> doesn't better solution because I can't set a valid SRID. >> >> Thanks! >> > >> > _______________________________________________ >> > postgis-users mailing list >> > postgis-users@postgis.refractions.net >> > http://postgis.refractions.net/mailman/listinfo/postgis-users >> > >> > >> _______________________________________________ >> postgis-users mailing list >> postgis-users@postgis.refractions.net >> http://postgis.refractions.net/mailman/listinfo/postgis-users > > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > > _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
