Terrain information like contour lines, hillshades, and slopes, help you to visually assess the lay of the land and relief, navigability, and more. The topographic information can on the map be represented by slope shading, contour lines, and/or steepness coloring.

The underlying data originates from SRTM and ASTER.

Further reading at http://osmand.net/docs/user/plugins/contour-lines .
Vergemoontlik dei aflaai van aflyn kontoerlyne en heuwelsakdus ('Instellings'->'Inligtingsbestuur' ->'Aflaai' ->Kies verlangde kaart-tipe).