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Calculate:
29
23
52
-------- -
-------- -
+
=
-------- -
100
100
100
Take 52 per cent of 25 m / 82 ft. This is 13 m / 42.6 ft. Multiply this by the cosine of
9 degrees.
0.987 x 13 m = 12.8 m or equally in feet 0.987 x 42.6 ft. = 42 ft.
Method 2. Multiply the ground distance by the slope angle cosine.
0.987 x 25 m = 24.6 m or equally in feet 0.987 x 82 ft. = 80.9 ft.
Add percentage readings as above and take the sum percentage of the corrected
distance.
52
×
-------- -
24 6m
,
=
12 8m
100
or equally in feet
52
×
-------- -
80 9ft
,
=
42ft
100
This example shows that a slope angle of 9 degrees causes a correction of only
2.3 per cent but when the slope angle is 35 degrees the correction means a reduction
of about 18 per cent in the observed height.
14
,
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