Other Factors Affecting Quality
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3-17
Fog
In fog, water droplets diffuse and refract the laser beam. In
foggy conditions, the laser receiver will be unable to locate the
beam, even if you can see the transmitter.
Curvature of the Earth
In theory, a transmitted laser beam will go forever in a straight
line; however, the earth is round. Even if the laser has slope
dialed in, the affects of a straight beam of light on the round
earth are the same. Unless grading at extreme distances, the
errors generated from the curvature of the earth are
undetectable.
If leveling huge fields, use multiple transmitter setups due to
the limitation of the laser distance. Since each laser transmitter
levels itself using gravity, the total field distance will not cause
compounding errors.
Table 3-1 shows the error’s due to the earth’s curvature at
distances from the laser transmitter.
Table 3-1. Errors Due To Earth’s Curvature
Distance From Laser Curvature of Earth
500’ / 152m .006’ / .00183m
1000’ / 305m .024’ / .00732m
1500’ / 457m .054’ / .01646m
2000’ / 610m .096’ / .02926
2500’ / 762m .150’ / .04572m
3000’ / 914m .215’ / .06553m
4000’ / 1219m .383’ / .11674m
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