[postgis-users] Fw: please help me about postgis

[alireza ghahremanian]

I have found the solution :-)

SELECT makeline(makepoint(x,y)) FROM test;

thanks a lot

----- Original Message ----
From: Shoaib Burq <shoaib at nomad-labs.com>
To: PostGIS Users Discussion <postgis-users at postgis.refractions.net>
Sent: Sunday, January 21, 2007 3:04:33 PM
Subject: Re: [postgis-users] Fw: please help me about postgis

Ah sorry... I missread you email must have been sleeping...

To create a linestring you need at least two points.

What is the error you get?

On 1/21/07, Shoaib Burq <shoaib at nomad-labs.com> wrote:
> Ah sorry... I miss read you email must have been sleeping...
> to create a linestring you need atleast two points.
>
> What is the error you get?
>
> On 1/21/07, alireza ghahremanian <mat2ag at yahoo.com> wrote:
> > I need create a line from this point which are dynamically updated so the line should be updated.
> >
> > ----- Original Message ----
> > From: Shoaib Burq <saburq at gmail.com>
> > To: PostGIS Users Discussion <postgis-users at postgis.refractions.net>
> > Cc: alireza ghahremanian <mat2ag at yahoo.com>
> > Sent: Sunday, January 21, 2007 2:24:25 PM
> > Subject: Re: [postgis-users] Fw: please help me about postgis
> >
> > Alireza,
> >
> > There is no need to specify x and y data values explicitly. The
> > AddGeometryColumn() takes care of it. If you need a table with point
> > data then do something like:
> >
> > CREATE TABLE test
> > {
> >  id integer NOT NULL,
> >  name varchar(128),
> >  CONSTRAINT test_pk PRIMARY KEY (id)
> > }
> > WITHOUTOIDS;
> >
> > SELECT AddGeometryColumn('test', 'test_geom', 4326, 'POINT', 2 );
> >
> > have a read of this
> > http://postgis.refractions.net/docs/ch04.html#id2837854 for a detailed
> > explanation of the process.
> >
> > hope this helps
> > Shoaib
> > --
> > http://geospatial.nomad-labs.com
> >
> > On 1/21/07, Shoaib Burq <saburq at gmail.com> wrote:
> > > The table you created is not spatial. to make it spatial you need to
> > > add a spatial column to it using AddGeometryColumn() function.
> > >
> > > There is no need to specify x and y and explicitly. The
> > > AddGeometryColumn() takes care of it. If you need a table with point
> > > data then do something like:
> > >
> > > CREATE TABLE test
> > > {
> > >   id integer NOT NULL,
> > >   name varchar(128),
> > >   CONSTRAINT test_pk PRIMARY KEY (id)
> > > }
> > > WITHOUTOIDS;
> > >
> > > SELECT AddGeometryColumn('test', 'test_geom', 4326, 'POINT', 2 );
> > >
> > > have a read of this
> > > http://postgis.refractions.net/docs/ch04.html#id2837854 for a detailed
> > > explanation of the process.
> > >
> > > hope this helps
> > > Shoaib
> > > --
> > > http://geospatial.nomad-labs.com
> > >
> > > On 1/21/07, alireza ghahremanian <mat2ag at yahoo.com> wrote:
> > > > I have a table like this:
> > > >
> > > > CREATE TABLE test
> > > > (
> > > >   id integer NOT NULL,
> > > >   x double precision,
> > > >   y double precision,
> > > >   CONSTRAINT test_pk PRIMARY KEY (id)
> > > > )
> > > > WITHOUT OIDS;
> > > >
> > > > which contains some coordinates  (x,y) of a track now I want to insert a geometry entry from this data in another table with a SELECT command something like this
> > > >
> > > > SELECT  GeomFromText('LINESTRING(x y)') FROM test;
> > > >
> > > > but it does not work please help me. I should note that the data in table test will update every 5 sec. so I must my geometry tables with respect to test table data.
> > > >
> > > > with special thanks
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
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