[postgis-users] Postgres Polygon to Postgis Geometry

[Wagner Santos]

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 <mwtoews at 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.desenv at 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.desenv at 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!
> >
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> >
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