3-5-6 
programs for computing accuracy matrix Qxx 
and reliability matrix QwP are developed 
respectively in~WuCAPS G /» 5 software package. 
The all, or part, or only dialog elements of the 
Qxx and QwP can be calculated for different 
purpose. Finally, the theoretical standard 
deviation of the each unknown parameter and 
the redundancy numbers for each observation 
are given. 
□ Estimation of posterior variance components 
It is possible to introduce simultaneously 13 
kinds of observations into the WuCAPS G/ >s for 
integral adjustment. The priori weights of all 
used observations must be specified before 
combined bundle adjustment. However, it is 
difficult for operator to define a reasonable 
weight for each type of observation. According 
to the residuals of the observations after 
adjustment, the weights can be adjusted to the 
optimal values by the program of estimating the 
posterior variance components. 
□ Drawing of the distribution chart and the 
residual sketch of ground control points 
The goal of the program is to display directly the 
location of the photogrammetric points in 
geodetic coordinate system and the residuals of 
the ground control points on the terminal. Of 
course, these charts can be plotted out on a 
selected printer or plotter. 
□ Mosaic of adjustment blocks 
A large project may be divided into several 
calculation units. The coordinates of the same 
points among adjacent blocks must be equal 
after adjustment in whole project. The goal of 
this program is to find those homologous points 
and to solve the arithmetic average of their 
coordinates. At the same time, it checks whether 
the adjusted results meet the specification or not. 
4. EXPERIMENTAL RESULTS 
Our first test obtained the exciting results from an actual 
GPS-controlled photo flight over the Taiyuan test field in 
May, 1994 [Li and Yuan, 1995]. Based on this 
operational experience, the technique of airborne GPS 
survey, arrange of the ground control points and data 
processing of combined bundle adjustment are refined. 
Up to now, we have made fifteen successful experiments 
and production in China. In the present section, these 
experiments will be discussed. 
Figure 3 shows the distribution of these test sites in China. 
The main technical data of the GPS-supported photo 
flights are listed Table 1. 
Fig. 3 Distribution of Projects for GPS Aerotriangulation in China