<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt"><div>Hi all.<br>I was reviewing postgis workshop presented in FOSS4G 2007. it presents a trick like this for making invalid features valid:<br>UPDATE bc_voting_areas<br>SET the_geom = ST_Buffer(the_geom, 0.0)<br>WHERE gid = 4897;<br><br>I'm wondering how it works in background!!!. I mean how buffering with zero distance makes features valid?<br>what is in buffer function?<br><br>Regards<br></div>
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