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.
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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