<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:#000000;"><div>Hello:</div><div><br></div><div>I am wondering if there is a rule to follow when tracing buildings using aerial imagery. On the default, Yahoo imagery, the buildings are slightly displaced so in addition to the roof you can see the foundation of certain sides of the building. Should this be ignored and the building drawn based on the roof?</div><div><br></div><div>Thanks</div><div style="position:fixed"></div>
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