![]() ![]() The resulting terrain at this point was a grayscale image. This method was developed by Professor Tanaka Kitiro in 1950, but had been experimented with as early as 1870, with little success due to technological limitations in printing. Otherwise, slopes facing the light source would be represented by white bands. If the object being illustrated would shadow a section of contour line, that contour would be represented with a black band. ![]() Lines are highlighted or shaded depending on their relationship to a light source in the Northwest. The Tanaka (relief) contours technique is a method used to illuminate contour lines in order to help visualize terrain. On maps produced by Swisstopo, the color of the contour lines is used to indicate the type of ground: black for bare rock and scree, blue for ice and underwater contours, and brown for earth-covered ground. Siegfried map of Bernina Pass (1877) with black, blue and brown contour lines at 30-meter intervals ![]()
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