233 
aggregation and fused images. The bigger the correlation 
coefficient and the smaller the bias index, the closer the 
resolution of the fused image and the resolution of the image 
aggregation. Then we can determine the real spatial resolution 
of remote sensing fused image quantitatively. The experiments 
show that the resolution of the fused image from SPOT image 
and TM image is closer to 17m. However, the resolution of the 
image aggregation is the nominal resolution, but not the real 
resolution. In order to get the better result, we should get the 
more precise image aggregation, which we should do better in 
the later research. 
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ACKNOWLEDGEMENT 
This work was supported by State Bureau of Surveying and 
Mapping key laboratory of Geographic Information 
Engineering Foundation of Researches, Grant B262