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We propose a method for detecting changes of buildings by comparing aerial images which are taken at dierent times. In the proposed method, we consider shadow and shading model. The model is derived f r om a relation between incident light of the sun and 3-D shapes of buildings which intercept the incident light. The advantage of the proposed method is that we only compare 2-D aerial images based on the model without estimating 3-D shapes of buildings. When we compare the aerial images, we have the problem that changes of shadows and buildings are observed simultaneously in the images. To solve this problem, we propose criteria for distinguishing the changes of shadows and buildings. Our experiments have shown that the proposed method can distinguish the changes of shadows and buildings in real aerial images.

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