I use the SRTM DEM and I have used the "Project Rater" tool in ArcGIS10.2 in order to project it from GCS_WGS_84 to a certain UTM zone in WGS84. With my projected elevation raster, I have calculated slope (min: 0, max:73 in degrees) and aspect (0-360). When I try to convert again the projected slope and aspect into GCS_WGS_84 (my analysis must be carried out in latitude, longitude) their values change, and I get for slope min:-1,24 max:74 (in degrees), and for aspect I get 1-460! Why does this happen?
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