2.5维电子地图渲染成图接边方法探讨

Discussion on the Method of 2.5-Dimensional Electronic Map Rendering

2.5维电子地图与二维、三维矢量地图有着明显区别,其分批渲染成果是栅格数据,最后成果也是图像的形式,所以在地图接边的方式上比矢量图接边的方法要复杂得多。本文探讨了一种方法,使用虚拟相机确定2.5维电子地图俯瞰视角,制作批量渲染成图的接边参考框架,最后分批渲染景观模型与框架进行图像叠合。这种方法在项目实践中初见成效,能最大限度地缩小接边误差,不足之处是人工干预部分较多,必然导致误差累积,有待改进。

2.5 -dimensional electronic map and two- dimensional, three -dimensional vector map has a significant difference, and its batch rendering results are raster data, the final result is the form of the image, so the way the edge of the map than the vector dia- gram of the method to be complicated Much more. This paper explores a method of using a virtual camera to determine the 2.5 - di- mensional electronic map overlooking the angle of view, making the batch rendering of the border reference frame, and finally the batch rendering landscape model and the framework for image overlay. This method in the project practice in the initial results, to minimize the edge error, the inadequacies of the manual intervention is more, will inevitably lead to error accumulation, to be im- proved.