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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

Hi

 

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.

http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/How_Slope_works/009z000000vz000000/ 

 

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

 

Alexandre

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