地籍管理系统中的宗地历史回溯

在城市的改造和建设过程中,宗地的演变是十分复杂的。为此,根据建筑施工组织设计中"单代号图"和"横道图"的原理进行宗地时空数据库设计,对宗地历史回溯逻辑进行面向对象封装,并引入时间属性和回溯属性,在地籍管理系统中成功实现宗地历史回溯。提出的宗地历史回溯包括宗地历史的储存和宗地变更过程的回溯。实际地籍管理应用表明该方法极大地提高了地籍变更处理的准确性和工作效率。     

Solving Topological and Geometrical Constraints in Bridge Feature Model

The capacity that computer can solve more complex design problem was gradually increased. Bridge designs need a breakthrough in the current development limitations, and then become more intelligent and integrated. This paper proposes a new parametric and feature-based computer aided design (CAD) models which can represent families of bridge objects, includes knowledge representation, three-dimensional geometric topology relationships. The realization of a family member is found by solving first the geometric constraints, and then the topological constraints. From the geometric solution, constraint equations are constructed. Topology solution is developed by feature dependencies graph between bridge objects. Finally, feature parameters are proposed to drive bridge design with feature parameters. Results from our implementation show that the method can help to facilitate bridge design.