2 Sentences With "isohypses"

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First developed in France in the 18th Century, contour lines (or isohypses) are isolines of equal elevation. This is the most common way of visualizing elevation quantitatively, and is familiar from topographic maps. Most 18th- and early 19th-century national surveys did not record relief across the entire area of coverage, calculating only spot elevations at survey points. The United States Geological Survey (USGS) topographical survey maps included contour representation of relief, and so maps that show relief, especially with exact representation of elevation, came to be called topographic maps (or "topo" maps) in the United States, and the usage has spread internationally.
Three more editions were issued up to World War II. After the war the atlas maintained the same character with relief in the style of the great classic atlases (hachuring), in contrast to newly published works, that used isohypses (contour lines) to indicate altitudes. This, side by side with the superior typography of the hand-drawn type in the Atlante Internazionale, the lettering, gave the maps a very attractive appearance. The seventh edition was issued 1955/56, the last and eighth edition in 1968: an atlas of 50 x 32 centimetres with 94 tables, in total 173 pages of cartographic material, and an index, covering 250,000 geographical names; the map surface consisted of about 18 square metres! The eighth edition was finally reprinted in 1977.