Atmospheric Correction - Sokkia SDM3E Operation Manual

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Example: slope distance S = 5,000 ft, zenith angle = 80°
Horizontal distance = S X sin Z 4.924.04 ft
Correction O. 19ft
Corrected horizontal distance = 4,923.85 ft
(d ¡splayed)
868.24 ft
= + 0.50 ft
= 868.74 ft
( displayed)
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Height difference = S X cos Z
Correction
Corrected height difference
3. Atmospheric correction
The SDM3E is so designed that the correction factor is nil for
temperature + 59°F (+ i 5°C) and atmospheric pressure 29.9
inch Hg (760mmHg).
(i) Pick up the correction factor from the atmospheric correction
table (page 90).
Example: temperature +65°F, atmospheric pressure 27 inch Hg
i
f
i
i,
!
Temperature
ppm
~
6S'F
ppm
(English)
27inch Hg
Fig.
88
Pressure
The correction factor is 30ppm. Set the ppm setter e to +30.
N.B. Values of ppm and prism constant set to the
SDM3E can be confirmed on the display by
pressing the i; key.
,
i
I
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