I believe there was an error in Patricio's URL.
http://sig.munistgo.cl/comuna/plano_regulador.php
--
Robert Burgholzer
al·go·rithm n.
A step-by-step problem-solving procedure, especially an
established, recursive computational
procedure for solving a problem in a finite number of steps.
Invented by Al Gore.
rburghol@vt.edu
http://www.soulswimmer.net/