通过对经纬仪测绘法1：50 0地形测图过程中各个工序的分析，得出了1：50 0地形图上的点位中误差。
Through the analysis on every procedure of surveying 1:500 topographic map with the method of transit mapping, the position error of 1:500 topographic map is got.
对采用坐标展点器展绘碎部点坐标所测绘的大比例尺地形图的精度进行了系统地分析，并定量地给出了采用不同测距方式展点测图的点位中误差。
The precision of a large scale topographic map is systematically analyzed, which is measured and drawn with the help of coordinate point distributor for the distribution of the detailed points.
用对比的方法着重分析了提高测图精度的原因，并对DM 502红外测距仪的反射镜安置方法作了较详细的叙述。文章后谈到了DM 502红外测距仪测绘地形的优点。
Through comparison it is mainly discussed why the accuracy of mapping can be improved using DM502 as well as how to set the reflector related to DM502.
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