本文引入面向对象的时空数据模型，把各种实体作为对象，把道路作为面状要素描述。
The paper introduced object oriented spatiotemporal data model, looked on all kinds of things as objects and described road as face shape element.
本文引入面向对象的时空数据模型，把各种实体作为对象，把道路作为面状要素描述。
The paper introduced object oriented spatiotemporal data model, looked on all kinds of things as objects and described road as face shape element.
应用推荐