By Eduard Imhof
Eduard Imhof's vintage booklet 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 notion with the passage of time. One such paintings is Imhof's masterpiece on reduction illustration. As a different show of research and portrayal, this can be an exceptional instance of the necessity for cartography to mix mind and pics in fixing map layout difficulties. the diversity, aspect, and medical artistry of his recommendations are provided in a instructing context that places this paintings in a category on its own, with common importance.
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Extra info for Cartographic Relief Presentation
The most common survey scales at that time were 1:50,000 and 1:25,000. Around the middle of the last century, for example, only about 2 to 3 points were surveyed per square kilometer for the 1:50,000 scale mapping (115 and 116) of many parts of the high mountain regions of Switzerland. The detailed formation of the contour pattern was accomplished by visual interpolation. But demands on the map and on its accuracy increased with the passage of time. This also gave rise to an enlargement of the survey scale and in the number of surveyed points.
In certain techniques of investigation, it is assumed, for the sake of simplicity, that the corresponding points lie on perpendiculars to the contour lines, that is, on vertical trajectories. Points of intersection of such trajectories with the two contour lines would thus designate corresponding points. This may be the case. In quite a few places, however, buildings or terrain features indicate that this is not always true. In the immediate vicinity of sharp bends in the contour lines, there are no vertical trajectories at all.
We can, for example, survey several selected test areas in differing terrain at very large scale with very small contour interval and the greatest possible accuracy. Accuracy must, in this case, be so improved that the results of the survey can be considered as the true contour map of the test area being used. This contour line image is then compared with the contours to be checked. Such a method has proven to be very costly, so that up to now it has been used only occasionally for methodical experiments.