Re: build a polygon from points

About st_makeline an array is needed like this example:

select st_makepolygon(ST_MakeLine(array[st_point(3, 2),st_point(2, 2),st_point(3, 3),st_point(2, 5),st_point(5, 5),st_point(3, 2)]));

 

greetings

Nicklas

2009-06-23 Caspa wrote:

Hi, thanks for that,
>those are colunm in the table :
>
>       coord1  |     coord2    |  coord3       |  coord4      |  pol
> ----------------------------------------------------+--------------------
>  geom_data | geom_data | geom_data | geom_data |  I WANT THIS
>
>I tried with this but didnt work;
>
>SELECT ST_MakePoly(ST_MakeLine(coord1, coord2, coord3, coord4, coord5, coord1 ) from table
>
>the problem is that I can't make i line from more than two points ( i'm using postgis v 1.3.5 and geometry ST_MakeLine(geometry[] point_array); doesn't work)
> I'm trying to figure out how to use
>
>geometry ST_MakeLine(geometry set pointfield);
>
>but how do I build a geometry set pointfield???
>sorry...really beginner!!
>
>
>
>
>
>
>>

2009/6/22 Paragon Corporation <lr@...>
>Andrea,
> Are those individual records or columns in the table?
>
> Take a look at ST_MakeLine, ST_MakePolygon, ST_BuildArea
>
>postgis.refractions.net/documentation/manual-svn/ST_MakeLine.html
>
>postgis.refractions.net/documentation/manual-svn/ST_BuildArea.html
>
>postgis.refractions.net/documentation/manual-svn/ST_MakePolygon.html
>
>
> You build a line from points with ST_MakeLine and then do a ST_BuildArea or
> ST_MakePolygon depending on your desired effect.
>
> Leo
>>

> >

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