By Eduard Imhof
Eduard Imhof's vintage publication Cartographic reduction Presentation is once more on hand. in the self-discipline of cartography, few works are thought of classics within the experience of maintaining their curiosity, relevance, and thought with the passage of time. One such paintings is Imhof's masterpiece on reduction illustration. As a special exhibit of research and portrayal, this can be a good instance of the necessity for cartography to mix mind and portraits in fixing map layout difficulties. the diversity, aspect, and clinical artistry of his suggestions are offered in a instructing context that places this paintings in a category on its own, with common value.
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Extra resources for Cartographic Relief Presentation
On the other hand, one cannot overlook that in surveys of steep terrain, even in photogrammetric plotting, the contour lines are drawn more carefully, positioned more accurately, and are more finely detailed, the smaller the contour interval chosen. Good or bad surroundings are not without influence. A plane-table topographer, moreover, never treats lines individually and independent of each other, he is always aware of surface form and thus of complete contour groupings. In any case, the evaluation of cartometric accuracy is dependent upon the contour interval.
At this stage, spot heights, contours and contour interval are assumed to be familiar concepts. 1. Plane-table survey or plane-table tacheometry Plane table survey, also known as plane table tacheometry, is the classical method of topographic land survey. In this case the topographer bases his work on a triangulation net which is already in existence. This system of permanently marked and accurately deter- 16 The Topographic Foundations mined ground control is densified, as a rule, by graphic triangulation of detail, or traversing.
They appear in poor quality plane-table sheets, normally as a result of inadequate observation and careless interpolation during survey. They can, in addition, also occur, in photogrammetric plotting through careless contour drawing or through the concealment of the ground by vegetation, snow, shadows, etc. In general, however, errors in this context are rare. One single contour line cannot show slope error. The concept of slope or gradient error is always made with reference to a group of contours.
Cartographic Relief Presentation by Eduard Imhof