摘要

Formal model of spatial directional relation is one of the most important parts in the area of spatial relations, and it is necessary to develop a new model with high generality and practicality. Firstly this paper analyzes the characteristics and defects of present models; secondly introduces in detail the basic idea and construction method of quadtree histogram; thirdly arithemetic mean method and compatibility method are used to judge spatial directional relation finally to prove the correctness of the model, several calculation examples are given. The experimental results show that the model is feasible.