[postgis-users] Union and Intersection of polygons
ravivundavalli at yahoo.com
Mon Jan 19 07:32:41 PST 2009
do we have
UNION of Polygon layers:
where in two polygon layers are subjected to overlay analysis which results in joining both, with addition of attribute columns.
Where the polygons intersect. both layers will have attributes written.
Where the polygons do not, intersect, both layers will have attributes null
for that layer.
INTERSECTION of Polygon layers:
where in two polygon layers subjected to overlay analysis results in joining both, with addition of attribute columns only where polygons intersect. The non intersecting polygons are not written to the result.
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