【摘要】 二维平面地图和三维空间场景集成是当前地理信息系统的一种重要应用方式。构建了一个由二维平面地图与三维空间场景集成的虚拟城市地理信息系统,包含建筑地物模型的加载与漫游功能。在此基础上研究了二维场景和三维场景在可视层面上的联动关系与实现途径。基于参数假定,提出了一种联动算法,根据二维平面视点参数定位三维场景视点位置,根据三维场景视点参数定位二维平面视点位置,并通过事件触发机制保持二者视图在交互过程中的位置同步发生变化。二三维联动系统实现了操作二维或三维中的一个视图时,另一个视图同步移动到相同的区域和视角。通过三种不同条件下的视角转换获取到二者场景视点的同步效果,实现效果表明,该系统能够适应各种用户操作下的视点同步,具有可行性和精确性。更多还原

【Abstract】 The integration of 2D geographic information system( GIS) and 3D GIS is an important application of the current virtual city system. A virtual city system that integrated 2D GIS and 3D GIS was constructed. On this basis,visualization interactive of 2D GIS and 3D GIS were researched. The interactive algorithm was proposed based on the assumption of parameters. Three different views were used as contrasts to verify the accuracy of the algorithm. Results show that the viewpoint position of the 3D scene can be located according to the 2D scene viewpoint parameters,the viewpoint position of 2D scene can be located according to the 3D scene viewpoint parameters as well,and the position synchronization is maintained in both views through event trigger mechanism during interaction. When user manipulates one viewpoint in 2D GIS or 3D GIS,the others moves synchronously to the same area and angle. The implementation results show that the algorithm of synchronization can adapt to various user operations,with feasibility and accuracy.更多还原