<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial, helvetica, sans-serif;font-size:10pt"><div>Does anyone know of a way of chaining functions to do an aggregate intersection? I have a table where i have multiple polygons and i need a intersection(geometry set) function.<br><br>Could i possibly write my own in plpgsql by getting the geometry set and looping through the polygons and more or less recursivly return Intersection(the_geom[3],Intersection(the_geom[2],Intersection(the_geom[0],the_geom[1])) ?<br><br>Curtis<br></div></div></body></html>