I'm trying to apply a constant slope angle to a raster (DEM) surface. The context is that I'm looking to show a land form upon final completion of works, I've reclassified a number of areas within a DEM (reduced elevation/cell values) but want to smooth the surface of the reclassified areas to a constant slope angle.

I'm working in QGIS and have seen help for a similar question in ArcGIS (Creating constant slope DEM using ArcGIS Desktop?) that I haven't been able to directly translate.

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