Roger, I'd be happy to help. If I get it correct, the only missing piece is a WKB or WKT driver to convert to sp class (and vice-versa)? Etienne -- View this message in context: http://r-sig-geo.2731867.n2.nabble.com/passing-SQL-through-readOGR-tp3816889p5770881.html Sent from the R-sig-geo mailing list archive at Nabble.com.