Hallo
Does A distance of 0 mean that the polygons touch each other or it
means that their bounding box touch each other?
From ST_Distance distance 0 menas that they are touching or overlapping
each other
What does a distance of 100 mean?. Is it the shortest distance between
the 2 polygons or the distance between some random point on the
polygon or on the surface?
It is the shortest distance between two polygons. You can use
ST_ShortestLine to find what that two points (first and last point in
the resulting line)
HTH
Nicklas
thanks
Steve
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