The first of these methods yields a hypsographical, or - if the sea-bottom be included, in which case all contours are referred to a common datum line - a bathy hypsographical map. Carl Ritter, in 1806, employed graduated tints, increasing in lightness on proceeding from the lowlands to the highlands; while General F.
Papen, on his hypsographical map of Central Europe (1857) introduced a perplexing range of colours.
A hypsographical map affords the readiest solution of this question.
The hypsographical map facilitates likewise the determination of the mean height of a country, and this height, combined with the area, the determination of volume, or cubic contents, is a simple matter.2 Relief Maps are intended to present a representation of the ground which shall be absolutely true to nature.