Correction for Slope
(Figure 9.1) Let s represents the slope distance between two points A and B, h be the difference in elevation and H the horizontal distance between the points, all in the same units. Let q be the slope of the terrain. Then, the horizontal distance is

H = s cos q or H = ( s2 - h2 )1/2

and thus, slope correction for measured distance s is

Ch = H – s = (s2 – h2) – s ( always subtractive)

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