In order to reali-e automatic reasoning with the original relations of rectangular cardinal direction relations between regions and then to improve model-s power of intelligent reasoning and prediction for direction relations
corresponding inference rules are given and their correctness is proved. An algorithm is proposed to automatically compute the original relations of the rectangular cardinal direction relations defined by a direction relation matrix and to reali-e automatic reasoning and calculation of the original relationship of the cardinal direction of the two-dimensional rectangle under the direction relation matrix model. The algorithm searches and prunes the solution space with the help of a queue. Theoretical analysis and experimental results show that the algorithm is correct and complete. This algorithm effectively solves the problem of automatic reasoning with the original relations of the rectangular cardinal direction relations
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