Greg, Have you combined the datasets into a single multiple-layer dataset:? You need to do that to do so in order to apply a simple difference formula in ER Mapper. The method works well.
John Cady ______________________________________ ----- Original Message ----- From: "Greg Reinecke" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, October 01, 2002 2:52 PM Subject: Comparing Gridded Datasets > Hello List, > > I have been working with a client that has numerous gridded elevation > datasets produced over time. We wish to compare changes between two > datasets that cover the same extents on the ground and have the same pixel > dimensions. I tried using the provided formula for calculating the > difference between two datasets but just can't seem to get the desired > results (difference between the two datasets). I suspect I am doing > something wrong in the algorithm. Any insight would be much appreciated. > > ********************************************** > Gregory T. Reinecke > President & CEO > Geographic Technology & Resource Systems, Inc. > P.O.Box 651023 > Potomac Falls, VA 20165 > www.gtrsystems.com > > ----------------------------------------------------------- > > To make changes to your subscription, please visit our website, http://www.ermapper.com/technicl/ermapperl/index.htm > > > ----------------------------------------------------------- To make changes to your subscription, please visit our website, http://www.ermapper.com/technicl/ermapperl/index.htm
