Finch, James Kip, 1883- · New York : John Wiley & Sons, Inc. · leaf 91
on the mountain ridges on the sides of Fig. 38,are unimportant and can be put in by eye. \ The principles used in this problem of visible area maybe used to make a landscape sketch showing the view of thehills and ridges from the point of observation. Thus if weheld a transparent vertical plane in… … Fig. 42.—Landscape Sketch Made from Map. PQ in Fig. 39, the points where the lines of sight Al, A3, A5,etc., cut this may be marked. By doing this for each of theradiating lines we secure the points plotted on Fig. 41 andthese can then be connected up by eye giving the view shownin Fig. 42. This…
Cartography · Military maps
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