Monday, 31 October 2016

How to find polygons inside polygon with PostGIS 2.0


I have a relation representing all the counties in my country and the other one containing all the districts - e. g. each and every county is composed of several districts. How do I select them with spatial query? I tried with


select nazorp from kraje as k, orp_wgs as o WHERE ST_Within(o.geom,k.geom) AND
k.nazev = 'Liberecký'


but had wrong results returned (well, they are probably not wrong, they are just not what I expected them to be). ST_Within only returns districts that don't share a boundary with the county, but I need to get all the districts within the county. Is that possible? I haven't found any built-in function suitable for my needs yet.




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