简要介绍了在多级空间信息网格间进行坐标变换的基本原理，通过对平面仿射变换与严格坐标变换坐标精度的比较发现，在适当尺度的网格内。用平面仿射变换代替严格变换的坐标变换精度高于地图表达精度。试验结果为多级空间信息网格的划分及适应空间坐标变换的空间数据组织方式提供了尺度准则。

According to self-calibration bundle block adjustment, a mathematical model which solutes exterior orientation elements of the new imageries by using fixed imageries in the same area is set up at first. The orientation parameters of the fixed imageries are previously obtained. Several sets of aerial imageries at different scales are simulated based on a piece of DOM (Digital Orthophoto Map) with a scale of 1:50, 000 and corresponding DEM (Digital Elevation Model) with the interval of grid being 100 meters of some certain area. Finally, the exterior orientation elements of these new imageries and 3D coordinates of photogrammetric points are calculated by combined bundle block adjustment with the derived mathematical model. The empirical results show that the exterior orientation elements and the coordinates of the photogrammetric points are identical between the mentioned method and the conventional bundle block adjustment for the two periods of imageries at the same scale. However, when the image scales are different the adjusted accuracy has an apparent decrease but can still meet the specification of topographic maps. The experiment has verified that the determination of the orientation parameters of the new imageries by using the fixed imageries is correct in theory and is feasible in practice. And the accuracy of 3D coordinates of the hotogrammetric points, which are purely gained by combined adjustment with two periods of imageries, satisfies the requirement of the specification of topographic maps. That is to say, aerial riangulation without ground control points (GCPs) can be truly realized. It will have glory pplication future on the map revision,the update of geographic spatial information database and automatic change detection of multi-temporal imageries.

本文利用武汉测绘科技大学自行研制的摄影测量与非摄影测量观测值联合平差程序WuCAPS系统对天津蓟县某测区一组实际GPS 控制飞行的航摄像片进行了处理。针对GPS辅助空中三角测量中的若干问题，如构架航线的敷设、地面控制点的布设、无地面控制空中三角测量的精度等，进行了研究。通过对测区进行GPS辅助光束法区域网平差计算得到了与国外相同的研究结果。此外，文中还对如何实施GPS辅助空中三角测量提出了实用建议。

It is a well-recognised fact that data volume is a huge overhead for softcopy photogrammetry. For example, a file size of 100 Mbytes will be generated from a black-white aerial photograph if digitised with a resolution of 20

介绍了在WGS284坐标系中进行GPS辅助光束法区域网平差的基本原理以及利用大地水准面拟合方法实施大地高与正常高的变换方法。利用新疆库尔勒地区1：25000和1：50000实际航摄资料验证了理论与程序实现的正确性。试验结果表明，无地面控制GPS辅助光束法区域网平差可用于中小比例尺测图的加密，在WGS284坐标系中可以获得较高的点定位精度，而在国家80坐标系下，利用大地水准面拟合前后的GPS摄站坐标进行GPS辅助光束法区域网平差，加密精度没有明显差异。