U.S. Army Guide to Map Reading and Navigation by Department of the Army

Author:Department of the Army
Format: epub
Publisher: Skyhorse Publishing (Perseus)
Published: 2011-01-21T05:00:00+00:00

Figure 10-3. Points on contour lines.

g. There may be times when you need to determine the elevation of points to a greater accuracy. To do this, you must determine how far between the two contour lines the point lies. However, most military needs are satisfied by estimating the elevation of points between contour lines (Figure 10-4).

(1) If the point is less than one-fourth the distance between contour lines, the elevation will be the same as the last contour line. In Figure 10-4, the elevation of point (a) will be 100 meters. To estimate the elevation of a point between one-fourth and three-fourths of the distance between contour lines, add one-half the contour interval to the last contour line.

(2) Point (b) is one-half the distance between contour lines. The contour line immediately below point (b) is at an elevation of 160 meters. The contour interval is 20 meters; thus one-half the contour interval is 10 meters. In this case, add 10 meters to the last contour line of 160 meters. The elevation of point (b) would be approximately 170 meters.

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