PostgreSQL 9.1.4 on x86_64-unknown-linux-gnu, compiled by gcc (GCC)
4.4.4 20100630 (Red Hat 4.4.4-10), 64-bit
postgis-2.0.1, libgeos_c.so.1.7.5
gis=# SELECT st_area(ST_GeomFromText('POLYGON((-1 -1, 2 2, 0 1, -1
-1),(3 3, 5 5, 3 5, 3 3))'));
st_area
---------
-0.5
what does this mean? What is negative area?
In general, what are the semantics of polygons with more than one
sequence of vertexes?
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