Research And Software Development On The Basis Of The Graph Theory In Road Alignments Modeling

In road design, Road Alignments modeling is the most basic and the most important part. Road Alignments modeling at home and abroad have conducted a in-depth research, but there are still some issues remain unresolved. List structure is commonly used, the intersection roads can not handle. Database for data storage and data exchange is lack of solutions. Curve design in slow, incomplete, inaccurate calculation of transition curve.This view of the above problems in doing research and study. First, the entity in AutoCAD, the program defined in the primitive data objects and the relationship between the database model and database for data abstraction of data exchange problem, a lightweight implementation of the ORM (Object Relational Mapping) solution. Analysis of graphic design in the three primitives, the three pixel sum of public properties and possess their own special attributes. According to the analysis of primitive, simple and clear exposition of the relationship between several primitives. Then the specific coordinates of the transition curve formula, the calculation of proposed new rapid, high precision formula. Finally, graph theory, basic graphic design in the direction of dealing with the intersection of Station and made the discussion. The use of graph theory, automation to identify and correct the direction of the road, automated processing Stake initialization, and can automatically calculate the intersection point for the dynamic dragInnovation of this paper is: Curve do on new research and treatment. Of its mathematical model, which solves the more complicated calculation of the Fresnel integral. Makes the transition curve the coordinates of the formula more accurate, more stable performance of the approximate formula, no longer appear before the slip angle constraints and incomplete transition curve calculation of difficult problems. Organizational plan using graph theory element, intersection and road network for road conditions can be treated.