[GIS] Issues with QGIS Slope Analysis

qgisslope

Having issues with slope analysis. I click raster, analysis and then slope.

I enter my input and output and run the tool. The output I get doesn't appear to have been calculated correctly. Instead of seeing a continuos gradual change in slope through various colors, I just see a scattering of small squares.

It looks like only the max and min values are being displayed an nothing else (not sure).

Do I need to use the terrain analysis plugin for the tool to work? Or is there something in my workflow that I need to change/add? I am using version 3.0.3

Best Answer

Just guessing here. If your horizontal coordinate system is in degrees (such as wgs84) and your heights are in meters you calculation will not be accurate. can you reproject to a metrics crs and calculate slopes again?

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