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红外光测距仪在公路工程中的使用日益广泛。这种先进仪器在基线、导线、放线等方面的测量中,已显示出快速、精确的优越性。但红外光测距仪测得的高程(这种高程属于三角高程)精度如何,可用于哪些方面,现分析如下: H=Ltga+0.42L~2/R ……(1) 式中:H——高差; L——水平距离; a——竖直角; R——地球半径取R=6371000米。 (1)式第二项为地球曲率和大气折光改正。对(1)式微分得:
Infrared light rangefinder in the use of highway engineering is increasingly widespread. This advanced instrument has demonstrated rapid, accurate superiority in measurements at baseline, leads, pay-offs and the like. However, the infrared rangefinder measured elevation (this elevation belongs to the triangular elevation) how the accuracy can be used for what is the analysis is as follows: H = Ltga + 0.42L ~ 2 / R ...... (1) Where: H- - Height difference; L - Horizontal distance; a - Vertical angle; R - Earth radius take R = 6371000 meters. The second term of equation (1) is correction of earth curvature and atmospheric refraction. Differential on (1) is: