カール・リッター
Around 1820, modern geography was established by Carl Ritter. His maps included shared frames, agreed map legends, scales, repeatability, and fidelity. Such a map can be considered a "supersign" which combines sign systems—as defined by Charles Sanders Peirce—consisting of symbols, icons, indexes as representations. Other examples can be seen in the works of geographers Ritter and Alexander von Humboldt.