Leica TPS1200 user manual 212, Formula

Technical Data		TPS1200	212
Formula	The instrument calculates in accordance with the following formula:
	•	slope distance
	•	horizontal distance
	•	height difference

Earth curvature and mean refraction coefficient k = 0.13 are taken into account auto- matically. The calculated horizontal distance relates to the station height, not to the reflector height.

= D0 · ( 1 + ppm · 10-6) + mm

TPS12_058

= Y - A · X · Y

TPS12_059

= X + B · Y2

TPS12_060

	Displayed slope distance [m]
D0	Uncorrected distance [m]
ppm	Scale correction [mm/km]
mm	Additive constant, prism [mm]
	Horizontal distance [m]
	Height difference [m]
Y	* sinζ
X	* cosζ

ζVertical circle reading

A(1 - k/2)/R = 1.47 * 10-7[m-1]

B(1 - k)/2R = 6.83 * 10-8[m-1]

k	0.13
R	6.378 * 106 m