Frank, I was looking for the specification on the gdal website for the AIG Arc/Info Binary Grid format, but the link was bad. Can you check this link, or post the spec? http://www.remotesensing.org:16080/gdal/frmt_various.html#AIG "Format description" -> http://gdal.velocet.ca/projects/aigrid/index.html Thanks! -- Dan Greve -- Melbourne, FL