[postgis-users] makepolygon with geom info

[Obe, Regina]

I've never tried doing that complicated of a query in Mapserver so not
sure it will fly.   Well I did try once, but it was too slow so I just
created a table out of the statement

If you wanted to try the complex query


 DATA "newgeom FROM (SELECT Max(f.gid) as newgid, f.name,
ST_MakePolygon(ST_MakeLine(f.the_geom)) As newgeom
FROM (SELECT name, 0 as psort, gid, the_geom
		FROM foll 
	UNION ALL
		SELECT fs.*
		FROM 
		(SELECT DISTINCT ON(name) name, 1 As psort, gid ,
the_geom
			FROM foll
		ORDER BY name, gid) fs
	ORDER BY 1,2,3) As f
WHERE f.name = 'abc'
GROUP BY  f.name) As foo USING UNIQUE newid USING SRID=4326"   (change
4326 with your SRID).



Alternatively just create a new table

SELECT * INTO follpoly
	FROM 
 (SELECT Max(f.gid) as newgid, f.name,
ST_MakePolygon(ST_MakeLine(f.the_geom)) As newgeom
FROM (SELECT name, 0 as psort, gid, the_geom
		FROM foll 
	UNION ALL
		SELECT fs.*
		FROM 
		(SELECT DISTINCT ON(name) name, 1 As psort, gid ,
the_geom
			FROM foll
		ORDER BY name, gid) fs
	ORDER BY 1,2,3) As f
WHERE f.name = 'abc'
GROUP BY  f.name) As foo;

ALTER TABLE follpoly
  ADD CONSTRAINT follpoly_pkey PRIMARY KEY(newgid);

then your mapserver data part would just be

DATA "newgeom FROM follpoly USING UNIQUE newid USING SRID=4326"

You might also want to manually put in an entry in geometry_columns
table since some GIS apps require it.


Hope that helps,
Regina





-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
S.Reena
Sent: Wednesday, July 02, 2008 9:39 AM
To: postgis-users at postgis.refractions.net
Subject: Re: [postgis-users] makepolygon with geom info


Yupp that is done... now im trying to include that newgeom in DATA
section of
my map file to make a polygon ....bt it isnt wrking....this newgeom can
be
used for this or not....



S.Reena wrote:
> 
> I have a table with foll fields( the_geom, name, latlon, ....)...i
wanted
> to make a polygon by using those points whose name like 'abc' and put
it
> in the map...
> 
> how to do dis?
> 

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