在同一地区，不同时期、不同传感器平台的遥感影像数据具有不同的空间分辩率、波谱分辩率和时相分辨率，如果能将它们各自的优势综合起来，可经弥补单一影像上信息的足，扩大各自信息的应用范围。首先将同一地区的TM影像与IKONOS影像进行精确配准后，使用基于HIS变换的融合方法，将两种影像进行融合，融合结果在保持TM影像丰富光谱信息的基础上，引入了IKONOS影像的几何特征，从面弥补了TM影像分辩率低和IKONOS影像光谱信息缺乏的缺点，并生成具有1m分辩率的彩色影像；最后将融合结果与相应地区的DEM数据进行复合，生成了具有高度真实感的三维影像图。

In the same zone, the remotely sensed datas of different sensor and different time have different space resolution,spectrum resolution and temporal resolution. Synthesizing their respective advantages, we can fetch up the scarcity of single image's information and extend its application field. In order to apply remote sensing image in terrain simulation, we must get the remote sensing image with high space resolution and high spectrum resolution. In this paper, we use the TM image, IKONOS image and same zone's DEM to make three demention terrain map. In order to keep the TM image's spectrum information and import the geometry character of IKONOS to fetch up the disadvantage of TM and IKONOS,we first use the polynomial method to geometry registration the IKONOS image and TM image,then we use the fusion algorithm base on HIS transformation fuse the TM image and IKONOS image. Experiment results show that we can get 1 meter image resolution's color image by fusing the 1 meter image resolution's panchromatic IKONOS image and 30 meter image resolution's color TM image. Finally,We apply the fusion result in the terrain simulation by merging the fusion's image with same zone's DEM to create high three demention terrain map.