三维地面形变测量中独立模型法区域网平差程序的改进

LMPROVEMENT OF PROGRAM OF BLOCK ADJUSTMENT OF INDEPENDENT MODEL METHOD IN THREE-DIMENSIONAL GROUND DEFORMATION SURVEY

在三维地形变测量中,是用独立模型法区域网平差程序将单张的航空象片连结成一个区域的。而区域网平差的精度,在很大程度上又依赖于输入数据的精度。本文将输入数据中可能出现的差错区分不同类型,又在平差过程中的各个阶段,对原始数据进行严格的检校,确保区域网平差得到应有的平差效果。 用较严密的误差方程计算其带模型连接条件的相对定向元素,可减少反复选代运算的次数,在实际作业过程中也已获得良好的效果。

In three-dimensional ground deformation survey, the aerial Photograph are liked with each other to form a block through the program of block adjustment of indgependent model method. Therefore, the accuracy of block adjustment depends to a great extent on the eccuracy of the input data. In this paper the accuracy of block adjustment is ensured by first dividing these errors into different types according to the possible appearing errors of the input data, and then, checking rigidly the original data in each stage of the adjustment process.The times of iteration, calculate for repeating adjustment can be reduced by using more exact error equations to calculate the elements of relative orientation with the condition of the model joint. The method has obtained good results in practical operation process.