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Carl Troll (* 24 December 1899 in Gabersee, † 21 July 1975 in Bonn), was a German geographer, brother of botanist Wilhelm Troll.

From 1919 until 1922 Troll studied amongst other biology, chemistry, geology, geography and physics at the Universität in München. In 1921 he obtained his doctorate in botany and in 1925 his habilitation in geography. Between 1922 and 1927 he worked as assistant at the Geography Institute in Munich. Troll was engaged in research in the ecology and geography of mountainous lands: between 1926 and 1929 went in a research journey throughout South American Andean countries where he visited northern Chile, Bolivia, Peru, Ecuador, Colombia, and Panama. In 1933 and 1934 his research interests took him to East and South Africa; in 1937 Troll was in Ethiopia; and in 1954 he visited Mexico.

In 1930 he became professor of colonial and overseas geography in Berlin. In 1938 professor of geography in Bonn. Troll, who utilised aerial photographs in his research, coined the term Landscape ecology in 1939. He developed this terminology and many early concepts of landscape ecology and of high mountain ecology and geography as part of his early work applying aerial photographs interpretation to studies of interactions between environment and vegetation and from his research travels in the mountainous regions of Asia, Africa and South America, as well as his native Europe. He developed seasonal climatic charts and three-dimensional climatic classification from hydrological, biological and economical data.

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