基于MAPGIS坐标系转换的ETM影像配准方法研究

A STUDY ON THE ETM IMAGE REGISTRATION METHOD ON THE BASIS OF MAPGIS COORDINATE SYSTEM TRANSITION

美国马里兰大学GLCF的Landsat7 ETM影像(L1G级)采用WGS-84坐标系,而我国中小比例尺地形图一般采用西安80或北京54坐标系,要将马里兰大学GLCF的ETM影像与地形图配准,一般采集地面控制点(GCP)进行多项式几何纠正。但GCP的选取过程一直为一项繁杂的工作,常用的方法选取效率不高,精度不易控制。本文通过Map GIS坐标系转换的方法来实现ETM影像的快速配准,避免了繁杂的GCP选取过程,同时又保证了影像的配准精度,不失为一个较好的影像配准方法。

The coordinate system of Landsat 7 ETM image （LIG） of GLCF of Maryland University is WGS- 84,whereas that of the medium and small scale topographic map in China is BJ-54 or Xi？an 80. In order to register ETM image and our topographic map, generally we must select the ground points （GCPs） to be corrected by the polynomial geometric correction method. The selection of GCP is always very troublesome. The usual selection method is lack of efficiency and the precision control isn？t easy. In this paper, we have carried out the rapid regis-tration of ETM image with MapGIS coordinate system transition method, get rid of the troublesome selection of GCP,and guarantee of the registration precision of image, which is a good registration method of image.