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本文对ＴＭ数字镶嵌图象的内部几何精度进行分析后指出，传统的利用选取控制点建立图象间坐标转换方程，并利用此方程对图象进行处理，实施图象镶嵌的方法，在保证镶嵌图象几何精度方面存在着不足，用此方法得到的ＴＭ镶嵌图象的内部几何误差约８个象元；在对传统的图象数字镶嵌方法进行分析的基础上，笔者总结大量工作的经验并参照前人的作法，在选定的地图投影下利用旋转方法对ＴＭ图象进行处理，进而完成镶嵌工作、这种方法舍去了控制点选取的繁复过程，使镶嵌工作变得简单，同时可保证ＴＭ镶嵌图象的几何畸变很小，经检测，镶嵌后的ＴＭ图象内部几何误差小于２个象元。
In this paper, the internal geometric accuracy of TM digital mosaic image is analyzed. It is pointed out that the conventional method of selecting the control point to establish the coordinate transformation equation between images and using this equation to process the image and implement the image mosaic, The geometric accuracy of the image is not enough. The internal geometric error of the TM mosaic image obtained by this method is about 8 pixels. Based on the analysis of the traditional digital image mosaic method, the author summarizes a large amount of work experience With reference to the predecessors’ practice, using the rotation method to process the TM image under the selected map projection, and then completing the mosaic work, this method discards the complicated process of selecting the control points and makes the mosaic work easy. At the same time, TM mosaic image to ensure that the geometric distortion is small, after testing, tessellated TM image within the geometric error of less than 2 pixels.