He enlisted in the Union Army as a cartographer, topographer and military engineer. As well as a physicist and a mathematician, Maldonado was an astronomer, topographer, and geographer. Using low-power lasers, a topographer creates a topographic map of the cornea. Clarence King named Wilson the chief topographer of the USGS. Hachure representation of relief was standardized by the Austrian topographer Johann Georg Lehmann in 1799. In 1850 the mountaineer and topographer Johann Coaz served as his private secretary. The Devon topographer John Swete (d.1821) stated that Dennis Rolle Esq. In 1880 he was an assistant topographer on the first Flatters expedition. He became a topographer and surgeon for the International Expedition. Kern was the topographer of Fremont's third expedition through the American West. Joshua was the second of five sons of topographer John Kirby. Between 1912 and 1930 he worked as a topographer. With these publications he achieved fame in the scholarly circles as a classical topographer. After December 1942, he resumed his work as a topographer. Edward's role was as first assistant and topographer.