Urban road network grading generation method and system considering intersection steering relation

The invention discloses an urban road network grading generation method and system considering an intersection steering relation. The method comprises the following steps: step 1, identifying different grades of road sections: obtaining different grades of road section information by adopting track kernel density grading and morphological refinement; step 2, merging and optimizing the road sections of different grades: merging the road sections of different grades, and performing topology construction to form a complete road network; and step 3, intersection steering relation detection: performing intersection associated road section detection based on the intersection influence area, then performing traffic condition discrimination between the associated road sections, and finally performing steering relation identification on the traffic associated road sections so as to complete intersection steering relation detection. Different levels of road networks are generated based on the classification form, and t