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Slope: Spatial Analyst vs Image Analysis

Question asked by alex_mtq on Mar 9, 2015
Latest reply on Mar 11, 2015 by alex_mtq



I have a DEM (1 m resolution, Z in meter) derived from lidar data.


When I run Slope from ArcToolBox (Spatial Analyst, Surface) and i compare my result with the Slope function from Image Analysis tools, i don't get the same result slope image.


The second one is approximately 80% higher.


I've found the help for "How Slope works" in Spatial Analyst but nothing in Image Analysis. 


Does anyone know why I do not get the same results?