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- 2017
面向虚拟地球的海陆地形多尺度TIN建模及可视化方法
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Abstract:
提出了一种面向虚拟地球的海陆地形多尺度不规则三角网（triangulated irregular network，TIN）建模及球面快速可视化方法。利用贪心插入TIN表面简化算法构建海陆地形的离线TIN金字塔，并设计了一种高效的虚拟节点结构，对各级TIN构网实施无缝分割和分层分块存储。在利用离线TIN地形金字塔实现多尺度海陆TIN地形的快速检索和三维场景生成的基础上，通过一种接边关系编解码方案实时消除TIN地形渲染时的裂缝，最终实现多尺度海陆TIN地形场景的高效可视化。实验结果表明，该方法能显著减少海面渲染所需的面片数，并实现岛礁、海岸等破碎地形的高保真度表达，有效改善了传统虚拟地球系统采用规则格网（Gird）模式绘制海陆地形导致大量几何冗余和表达失真等缺陷
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