<DIV>Dear Sir,</DIV> <DIV> </DIV> <DIV>I'm trying to write a MATLAB program for calculating or creating shaded relief from a DEM. I have come across the equation attached to this e-mail which i believe represents calculation of the cell values heights.</DIV> <DIV> </DIV> <DIV>What I don't undersyand is how to handle the DEM, for example, how do I use the DEM together with the equation ?</DIV> <DIV> </DIV> <DIV>Kindly assist by shedding some light on the procedure used</DIV> <DIV> </DIV> <DIV>Kind regards,</DIV> <DIV>George</DIV><p> 
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