Working with DEM rasters from TNM 3DEP elevation data and trying to create a percentage slope map in QGIS. I added my rasters and tried running both the gdal slope that allows for % slope and the regular Slope QGIS plugin which goes to degrees.
When I run the Gdal function my scale max is much larger than 100, while the regular QGIS slope plugin spits back 0-89.999 but says all my land is 90 degree slope.
My coordinate system is NAD83 for the DEMs and WGS 84 for coordinates. I cant seem to be able to find the z units to make sure they are the same as X,Y so the tool isnt comparing degrees to feet; . Somewhat new to QGIS as my ArcGIS license expired.