Erik, How were you using ST_Union and what exactly do you mean by no result. no result as it looks blank? If you are using something like PgAdmin III - it will look blank because it exceeds the buffer supported by PgAdmin III. SELECT the_geom is null FROM (somequery or table) as foo LIMIT 1 will tell you if its actually returning no geometry Hope that helps, Regina
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of danny Sent: Friday, August 01, 2008 6:12 AM To: [email protected] Subject: [postgis-users] Merge all polygons from a dataset Hello everybody, I've converted a shapefile of Europe to PostGIS. I would like to merge all the countries together so that I only have one polygon left, the whole contour of Europe. I have tried ST_Union that gives me no result. I've tried several other functions to no avail. Does anybody know how I should proceed? Many thanks, Erik ----------------------------------------- The substance of this message, including any attachments, may be confidential, legally privileged and/or exempt from disclosure pursuant to Massachusetts law. It is intended solely for the addressee. If you received this in error, please contact the sender and delete the material from any computer.
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