[postgis-users] HELP adding spatial field to table

[Gregory Williamson]

I think it is rare that you'd want corrupt data. My usual approach has been to load my data set into a temporary table (only lasts for the session (or transaction)) and then apply sanity checks and either delete offending rows or modify them if you know sane values to set them to. 

Then create the geometries from the data set and insert it into my real table, possibly with something like
  INSERT INTO some_real_table SELECT gid,label_name,the_geom FROM foo WHERE IsValid(the_geom);

HTH,

Greg W.
(sorry for top-posting, challenged reader and pressed for time)

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net on behalf of Richard Heimann [C]
Sent: Tue 12/11/2007 4:57 PM
To: 'Michael Smedberg'; Richard.Heimann at nrl.navy.mil; 'PostGIS Users Discussion'
Subject: RE: [postgis-users] HELP adding spatial field to table
 
Thanks for the prompt response. And youre right there are some such values.
Is there a work around?

 Rich


-----Original Message-----
From: Michael Smedberg [mailto:Michael.Smedberg at redfin.com] 
Sent: Tuesday, December 11, 2007 6:55 PM
To: Richard.Heimann at nrl.navy.mil; PostGIS Users Discussion
Subject: RE: [postgis-users] HELP adding spatial field to table

Are you sure that x and y always have legit values?  If one were null or
the zero-length string, I think you'd get an error like that.

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
Richard Heimann [C]
Sent: Tuesday, December 11, 2007 3:44 PM
To: 'PostGIS Users Discussion'
Subject: [postgis-users] HELP adding spatial field to table

 All,

Im getting some strange behavior that I cant explain and sadly know its
likely trivial. My pursuit is simple, add a spatial filed to a table
containing x,y. 

First. AddGeometryColumn

 	SELECT AddGeometryColumn( 'crimetest', 'geom', 4326, 'POINT', 2)

Next (and where the trouble lies) 

	UPDATE crimetest
	SET geom = PointFromText('POINT(' || x || ' ' || y || ')', 4326)

This is the error I receive.

ERROR: Invalid OGC WKT (too short)
SQL state: XX000
Context: SQL function "geomfromtext" statement 1
SQL function "pointfromtext" statement 1

Can anyone shed some light on this?


Thanks
Rich



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