This paper describes a computer program which recognizes bridges, rivers, islands and lakes from satellite pictures. The program is structured into three basic parts: the world model, the low level operators, and the higher level program. The recognition process is conceived as a process of continuously refined verification of the hypothesized descriptions of objects. We use conceptual identification of objects during the recognition process as soon as we can; we equip these concepts with meanings in the three-dimensional world. We present several concrete examples as a demonstration of the capabilities of our program.
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