摘要
本文利用武汉测绘科技大学摄影测量与遥感系研制的联合平差程序WuCAPS系统，对按严格作业要求进行的西安地籍加密测区的两个规则小区摄影测量加密的若干精度问题进行了研究。通过对测区的自检校光束法区域网平差计算得出：区域网加密的内精度（各个像对相对定向单位权中误差之平均值）为±3.2μm，区域网光束法平差后的单位权中误差为±5.0～±6.0μm，这些已达到国际先进水平。平差坐标的理论精度为m_(xy)=1.7σ_0，m_z=4.6σ_0，实际精度为μ_(xy)=4.2σ_0、μ_z=5.9σ_0。经过对平差坐标残差的最小二乘配置后坐标精度为μ_(xy)=3.2σ_0，μ_z=5.8σ_0，这些数值与国外结果仍然有差距，文中分析了产生这种绝对精度差异的原因。此外，还给出了用国产1022胶片进行部分试验的结果。
This paper describes some investigations on the accuracy of photogrammetric block
adjustment. Two small regular blocks in Xi'an cadastral project were used.The test was
done by using the newly developed by the Department of Photogram metry and Remote
Sensing at Wuhan Technical University of Surveying and Mapping program system
for combined adjustment-WuCAPS. Some experimental results are derived from the
calculation by the method of bundle block adjustment with additional parameters. The
inner accuracy of block adjustment (mean square error of relative orientation for all
models) is ±3.2μm and the standard error of unit weight of bundle block adjustment is
±5.0-6.0μm. which reach the advanced levels in the world. The theoretical accuracy
of adjusted coordinates is mXY = 1.7σ0. mz =4.6σ0 and the practical accuracy is μXY=
4.2σ0, μz=5.9σ0. After a posteriori least squares collocaton of residuals. the coordinate
accuracy is μXY=3.2σ0 for planimetry and μz=5.8σ0 for height. In this paper. the
reason which causes the difference between theoretical and practical accuracy is discus-
sed. Besides. some test results by using Chinese 1022 film are also given.
出处
《测绘学报》
EI
CSCD
北大核心
1991年第3期232-238,共7页
Acta Geodaetica et Cartographica Sinica
关键词
摄影
测量
精度
加密
平差
Inner accuracy. Theoretical accuracy. Practical accuracy. Least squarescollocation
