中文摘要：

从理论高程精度的公式推导出发,阐述了像素分辨率和基高比是影响理论高程测量精度的主要因素,指出了理论高程精度对航摄系统的选择以及飞行参数的设计具有重要参考价值;进行了无人机航摄系统在滩涂高程测量中的应用试验,结果表明,无人机航摄系统的实际高程测量精度可以优于±15cm;最后通过理论高程精度和实测高程精度的对比分析,指出影像质量、像控精度以及空三解算精度等因素的优化是实测高程测量精度进一步提升的关键.

英文摘要：

Firstly, we derived a formula for the theoretical elevation precision, based on aerial photography technology. This makes it clear that the image resolution and the baseline height ratio are the main factors that affect the theoretical elevation precision. It is pointed out that the theoretical elevation precision has great value for the selection of the aerial photography system and the setting of the flight parameters. Secondly, we conducted an experiment on the application of an unmanned aerial vehicle （UAV） aerial photography system in the tidal flat elevation. The test results showed that the actual elevation measurement accuracy of the UAV aerial photography system can be less than ±15cm. We also conducted a comparative analysis of the theoretical elevation accuracy and the measured elevation accuracy, and confirmed that the optimization of factors such as image quality, photograph-control points, measurement precision and aerial triangulation accuracy, are key to further improvement in the accuracy of elevation measurement.