开放式空间基础信息平台的发展特征与技术内涵

基于测绘和地理信息产业发展背景，针对日益增长的数据融合、实时共享、深度处理和个性化的需求，对数字城市中测绘服务特征进行分析，重点介绍符合云计算模型的开放式计算环境、多路径数据更新、多源数据一体化集成、全尺度城市编码、自适应空间数据处理和动态在线制图等理论、方法与关键技术。在此基础上，研制开发了开放式空间基础信息平台，并成功应用于数字深圳的建设中。

Solution of Exterior Orientation Parameters for High-resolution Satellite Imagery Based on Quaternion Differential Equation

According to analyzing the imaging mechanism of high-resolution satellite imagery,a solution of exterior orientation parameters based on quaternion differential equation is presented.In this solution the unit quaternion is used to describe the attitude of the image,and then the rigorous geometric model based on quaternion differential equation is established.In order to solve this rigorous geometric model,three independent parameters are introduced to this solution.So that,it is not should to solve the unknown quaternion directly,but these three independent parameters,and the unknown number keeps the same as the existed method in photogrammetry.In addition,Tikhonov regularization theory is also used to solve the rigorous geometric model.Experimental results indicate that this solution,which can avoid computation of trigonometric functions completely,is right,stable and adaptive,and the orientation precision can be improved when these three independent parameters are used.