Elementary map and aerial photograph reading Page: 29
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Finally, we have a view from directly above, and we
can see that the shape of the hill is shown (fig. 47) just
as the shape of the cone was shown in figure 44. If we
take these lines out of the photograph and put them on
a map, as in figure 47, we can tell which parts of the map
are high and which are low.
It would clutter up the map too much to have the
number showing the height of each contour line, so
only a few of them are numbered. To make it easy to
count these lines, every fifth line is made heavier than
the others. The distance betwen contour lines on each
map is shown by means of a note at the bottom of the
map. This note may read, for example:
Contour Interval: 10 feet
This means the distance between any two neighboring
contour lines on that map is 10 feet in an up-and-down
(vertical) direction. Figure 48 shows how the contour
interval is noted on a map of Sackville: on this map the
contour lines are 100 feet apart.
SACKVILLE V k
CONTOUR INTERVAL 100 FT.
SACKVI NITY
Figure 48.
Since the highest point on the hill in figure 47 does
not fall exactly on a contour line, this point is labeled
with the exact height. On maps, such height numbers
are found often. Some things take their names from
these numbers. For example, if there are a number of
road junctions on a part of a map, and we wish to name29
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United States. War Department. Elementary map and aerial photograph reading, book, August 15, 1944; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc96653/m1/35/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.