On basic small scale landcover rendering
Many #OSM based #maps show #landuse areas at the high zoom levels in either a plain #color or using #patterns. At smaller scales landcover depiction is also useful in particular to delineate urban and rural areas and to allow the map user to identify different landscapes in particular if there is no relief depiction in the map. At small scales it is usually not the specific shape of individual landcover areas that needs to be shown but the overall distribution of the different landcover types. And due to the variable scale of the mercator projection certain needs for landcover depiction occur at different zoom levels depending on where on earth you look.