机载GPS辅助像控布设在数字醴陵大比例尺航摄成图中的应用

Application of Layouting Control Points Based on GPS-supported Aerial Triangulation in Large Scale Topographic Mapping about Digital Liling Project

本文以数字醴陵项目为例,设计800 km^2、1000 km^2、1200 km^2和1500 km^2四个不同面积的加密分区,采用GPS辅助光束法区域网平差的方法,在区域四角布设平高地面控制点,敷设两条构架航线,研究满足现行航空摄影测量作业规范的合理加密分区面积,并与常规光束法区域网布点方案外业工作量进行对比。研究表明:本次试验中利用上述方法在800 km^2-1200 km^2加密分区范围内能满足规范要求,减少80%左右的像片控制工作量,缩短航测成图周期,具有较高的推广应用价值。

Taking the project of digital city of Liling for example to design four aerotriangulation area with different area of 800 km^2, 1000 km^2, 1200 km^2 and 1500 km^2. Adopt the method of GPS- supported bundle block adjustment, when there are 4 XYZ ground control points around the comers of a block area, layouts 2 tie flights and research the reasonable size of aerotriangulation area which meet the current specifications of aerophotogrammetry and compare with the outside work of conventional bundle block adjustment. Research shows： In this experiment, the results confirms that the accuracy meets the requirement of the specifications in the range of 800 km^2-1200 km^2. It leads to more than 80% reduction in field survey for ground control points and shorten the period of mapping. As a result, the method illustrated in the paper is worthy of being widely applied.