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隧洞断面资料对于隧洞施工和运行都具有重要的价值。当前，测量隧洞断面，大都采用直角坐标法或极坐标法，这不但操作比较困难，而且测量精度难以保证，尤其是大断面的隧洞，这些缺点更为突出。隧洞全断面摄影测量法就可克服上述缺点，它由原来断面点的测量变为断面线的测量，使隧洞断面的实际轮廓获得逼真的反映，提高了断面测量的精度，节约了人力。通过在某电站引水发电隧洞中试验使用表明工效可提高三倍；测量精度当洞径为6m时，断面最大点位中误差达2.5cm，平均点位中误差为1.72cm，量测断面面积的相对精度达11.5‰。
Tunnel section data for the construction and operation of the tunnel has an important value. At present, most of the tunnel sections are measured by Cartesian or polar coordinates method, which not only is difficult to operate, but also difficult to ensure the accuracy of measurement, especially the tunnel with large section. These shortcomings are more prominent. Full-faceted tunnel photography can overcome the above shortcomings. It changes from the measurement of the original section point to the measurement of the section line, which realizes the realistic reflection of the actual profile of the tunnel section, improves the accuracy of section measurement and saves manpower. The test results show that the work efficiency can be increased by three times. The accuracy of measurement is 6cm when the hole diameter is 6m, the error of the maximum point is 2.5cm and the average error is 1.72cm. The measured area The relative accuracy of 11.5 ‰.