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路线测量一般是定中线进行的,在一般路线上下地形一致、没有河流峭壁傍靠而易于左右兼顾的情况下,中线测量是适当的。但在某些特殊地形的山岭地区,路线不利于中线测量时,须另行采用一种新的测量方法边线法(见图1)。1958年6月,我厅第三测量分队在测量阳春～信宜公路的最后一段路线时,曾经初次试用了边线测量,继后第六分队在丰顺县丰良～潭江公路测量,也曾经应用边线测量了4段路线。上述两次边线测量,效果都很好。
The route survey is generally carried out at the centerline, and the topography is consistent across the general route. Midline measurements are appropriate without the proximity of the river cliffs and the ease with which they are balanced. However, in some special terrain of mountainous areas, when the route is not conducive to the midline measurement, a new measurement method of edge detection (see Figure 1) shall be adopted separately. In June 1958, the third measurement unit of our department, when measuring the last section of the road from Yangchun to Xinyi, had the first trial of borderline measurements. Afterwards, the Sixth Detachment was surveyed in Fengliang County, Fengliang-Tanjiang Highway. The application of edge measurement of the 4 routes. The two sideline measurement, the effect is good.