This article can also help you: http://fluidbook.geoinformatics.com/GEO-Informatics_8_2011/#/36/ Best regards Jose Canalejo http://csgis.de/ -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.osgeo.org/pipermail/discuss/attachments/20120110/6bcfecc5/attachment-0001.html