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在规划道路的定线测量中,有时会遇到用解析法通过密集居民点作直线定点、定线的中线测量,在此基础上再作道路的纵横断面测量。解析法定线有很多种,现介绍一种简易而精确的导线法定线,其主要特点假设道路中线为纵坐标轴,所求得的坐标增量ΔX、ΔY 即为道路中线上的投影距和偏离中线的偏距,水平角观测改为在水平度盘上直接读坐标方位角,这种计算简便,能很快的测定中桩和里程桩的位置,其实测步骤如下(见图1):
In the planning of road alignment measurement, sometimes encountered through analytic approach through dense settlements for the line fixed-point, alignment of the midline measurements, and then for the vertical and horizontal cross-section road measurement. There are many kinds of analytical statutory lines. Now, we introduce a simple and accurate guideline of the guidewire. The main features of the guideline are the assumption that the center line of the road is the ordinate axis. The calculated coordinate increments ΔX and ΔY are the projection distance and deviation on the center line of the road Midline offset, horizontal angle observation instead of reading directly on the horizontal dial azimuth coordinates, this calculation is simple, can quickly measure the pile and mileage pile position, the actual measurement steps are as follows (see Figure 1):