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.
航摄旋偏角对测图定向精度的影响随着处理技术手段的变换而改变，也随着比例尺由小变大而改变。
The effect of aerial photographic swing angle to the orientation precision of digital photogrammetry changes with the processing technical methods and the size of map scale.
其中内业立体测图的方式和方法是提高精度的关键，它关系着整个工程的进度和质量。
In the industry of stereo mapping the way and the method is the key to improve the accuracy, which is related to the progress and quality of the whole project.
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