面向FME Objects的地理国情普查影像坐标转换技术研究

数字正射影像的坐标转换是地理国情普查中的一项重要工作内容。针对常规坐标转换方式的不足,提出了以规则格网转换方式为基础、以当前和相邻图幅影像为基本处理单元的坐标转换方法;在python编程环境下通过FME Objects组件对该方法进行了程序实现;并将该程序应用于武汉市地理国情普查数据生产,结果表明:该坐标转换方法可以满足数字正射影像分幅生产的精度要求,转换效率得到明显提高,为武汉市地理国情普查数据生产奠定了良好的基础。

Research on the Technology of Geographic Conditions Census Images Coordinate Transformation Based on FME Objects

The coordinate transformation of digital orthophoto map is an important content of geographic condition census.According to the lack of conventional coordinate transformation method,local coordinate transformation of current image and adjacent images method based on regular grid is proposed in this paper.It is executed through the FME Objects component on the python programming environment,and has been used in the data production of Wuhan geographical condition census project.The results show that the coordinate transformation method could meet the requirement of digital orthophoto map production,and the efficiency of data conversion has been improved obviously.It can lay a good foundation for data production in Wuhan geographic condition census.