Re: difference between overlap and intersect using geometric types of postgresql

dhoubrechts <dhoubrechts@cybernet.be> writes:
> Can somebody help me. I can't understand the difference between overlap
> of polygon and intersect of path.

A little looking in the code finds:

/*-----------------------------------------------------------------
 * Determine if polygon A overlaps polygon B by determining if
 * their bounding boxes overlap.
 *
 * XXX ought to do a more correct check?
 *-----------------------------------------------------------------*/
Datum
poly_overlap(PG_FUNCTION_ARGS)


Feel free to submit a better implementation ...

            regards, tom lane