Slope is shown on a map usually by contours being closely spaced, or by arrows shown along roads in some cases. Contours can sometimes obscure map features in some cases.
An alternative approach I have used to produce, is to colour-code both elevation and slope simultaneously in different colour channels.
In the cases below, I have used the blue band for elevation, and red for slope. Since I intended this as a map for cycling I have named the different scalings after professional cyclists.
|Elevation shading colour codes elevations from 50-400m above sea level in the blue channel, optimising the map to show elevations in the higher part of the range. Slope values are shaded from 0-10 degrees (up to 22.5%) in the red channel as earlier.|
I give a few more examples of this using a different slope scaling and downloads of larger image files on my website.