在1∶25万电子地图辅助下的TM影像精校正研究

首先对传统几何精校正方法的缺点进行了分析;然后介绍了所用TM资料的性能和覆盖范围以及电子地图的数据格式;并给出了在ENVI软件下定制地图投影的方法;最后提出了用1∶25万电子地图辅助进行TM影像几何精校正的技术方法。通过对校正结果的目视判别和误差分析可知:该方法的校正精确度可达到一个像元以内,可以满足工作要求;最后对本方法的优点和技术步骤分别进行了分析。

Research for Geometrical Correction of TM Image Based on 1∶250 000 Digital Map

In this paper, the shortcoming of method for traditional geometrical correction was first analyzed. Then, the performance and covered scope of TM data, the data form of digital map were introduced. At the same time, the method of customized map project by ENVI software was explained. At last, the technique method for geometrical correction of TM image based on 1∶250 000 digital map wasset forth. Through the visual distinction and error analysis for correction result we can draw a conclusion that the correction accuracy of this method was less than one pixel and this method could be used to achieve the demand of work. The merit and technique process about the method mentioned above were analyzed.