3维电子地图的高分辨率输出

High Resolution Output of 3D Electronic Map

3维电子地图的高分辨率、高质量打印输出具有重要的应用价值。设计了将视锥内场景分而治之的方法,不但符合帧缓存大小要求,而且通过基于子锥的数据过滤有效减少了参与绘制的数据量。提出了基于纹理映射关系的地形网格构建策略,提高了地图数据输出图像的分辨率。应用Intel Jpeg库实现分块图像直接输出,克服了旧有方法受到2Gb虚拟地址空间限制的不足。所提出的技术支持高效输出具有极高分辨率的高质量3维地图图像。

The 3D electronic map printing out with high resolution and high quality is important for application. Firstly, the method of decomposing the 3D scene in frustum was presented to reduce data quantity and fit the restrict of frame buffer＇ s size. Secondly, the construct strategy based on texture mapping relation was put forward to increase resolution of map data. Finally, Intel Jpeg Library was applied to overcome the limitation caused by 2 Gb virtual address space. The technologies above have solved the printing out of high resolution and high quality image of 3D electronic map.