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Light from the north-west.
Also known as: Hill shading, Shaded relief
The convention shading terrain as though lit from a fixed direction to give an impression of relief.
Gives an impression of terrain by shading slopes as though lit from one direction.
Contexts: Navigation, Maps
Lit from the upper left by convention rather than from any real sun position, because shading lit from below reverses the perceived relief and hills read as hollows — an illusion strong enough that the convention is effectively compulsory.
Contexts: Navigation, Maps
Purely illustrative and carries no measurable information, so a shaded map is not a source for slope or aspect.
Contexts: Navigation, Maps
Grey or coloured shading across the map surface, darker on slopes facing away from an assumed light source in the upper left.