影响航测高程精度的关键因素分析与探讨

Analysis and discussion on key influential factors of aerial survey elevation accuracy

在大比例尺航空摄影测量中,受诸多因素影响,高程测量的精度常难以满足规范要求。结合航空摄影测量的特点,对影响高程测量精度的主要因素进行了分析,并指出了在航测过程中从摄影到内业作业应注意的问题。藉此提出了提高测量精度的方法和思路,如选择合适的像机、控制飞行质量、优化像控设计与像控测量以及空三加密等有效措施。工程实例表明,采取上述措施后,可使高程测量精度满足规范要求。

In large-scale elevation measurement by aerial survey, due to influences of multiple factors, the measurement ac-curacy often can not meet the code requirement. In the combination of the characteristics of aerial photogrammetry, the main fac-tors influencing elevation measurement accuracy are analyzed and the problems to be paid attention from photogrammetry to indoor work are pointed out. Based on analysis results, the methods for improving the measurement accuracy are put forward, and it is considered that the effective measures for improving the elevation measurement accuracy are selecting right camera, controlling flying quality, optimizing image control design and increasing aerial triangulation density, etc. The measurement case shows that the adoption of the above mentioned measures can make the measurement accuracy meet the code requirement.