The problem happens after having the DEM, then I do the process of determining the slope and I get a new map in which the data do not correspond, it does not calculate it, then in percentage, because when I do it with grades, it only takes me two Ranges, one low and one high. For example I do not give the percentages, but very high values (0-7101609412, 7101609412-2485563294, etc.)
I have done it in ArcGis and QGIS, all the same happens, I have also used different types of DEM and nothing.
Thank you very much for the help you can give me.
check/ validate your DEM first ,
http://desktop.arcgis.com/en/arcmap/10.3/tools/spatial-analyst-toolbox/how-slope-works.htm
https://geonet.esri.com/thread/23190
try to calculate in degree slope
Thanks very much, now I can be generate the slope map, I need change the system of coordinate.
First you change the projection system in UTM projection system then calculate the process in 3D analyst in Arc GIS
DSM has to be checked for gaps and voids as well as the projection system to be in a meter based not degree based
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