[postgis-users] Newbie - ST_Exterior, ST_Interior, ST_Polygonize

[Intengu Technologies]

How does one use the following functions ST_Exterior, ST_Interior,
ST_Polygonize to work with a multipolygon (cadastre)  that has islands (over
1000).  I understand that ST_Exterior creates a polyline of the outside of
the polygon and ST_Interior creates the inside of the polygon.  You then use
ST_Polygonize to recreate the multipolygon from polylines.
Any assistance would help.

-- 
Sindile Bidla
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