Yes, that's right. ST_Boundary will convert the polygon to
[multi]linestrings which you can then use to extract the points.
These have examples that should help:
http://postgis.refractions.net/documentation/manual-svn/ST_PointN.html
http://postgis.refractions.net/documentation/manual-svn/ST_NPoints.html
http://postgis.refractions.net/documentation/manual-svn/ST_GeometryN.html
Mike, nice solution with your function. Have to give that a try sometime.
-- Kevin
tommy408 wrote:
How can I extract points from all the vertex of a polygon?
I see there are ST_NPoints and ST_PointN for linestring. But nothing for
polygons. Maybe convert polygon to linestring then linestring to points?
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