Hello all,
I am trying to get the boundary of a geometry(polygon) field in postgis
(multiple polygons in this field). I have this so far:
ST_BOUNDARY(ST_COLLECT(wkb_geometry))
which outputs MultilineString. I need to convert this to a polygon. I
have tried all sorts of things from ST_DUMP to converting to text and then
trying ST_BdPolyFromText but got nothing to work so far. ST_Convexhull
gives me a polygon but unfortunately its not what I want.
Could someone let me know what I should be calling.
Thanks
Tom
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