面向虚拟地球的海陆地形多尺度TIN建模及可视化方法
发布时间：2018-12-07 13:51
【摘要】：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。
[Abstract]:In this paper, a method for modeling and fast visualization of the spherical surface of a multi-scale irregular triangular network (triangulated irregular network,TIN) of land and sea terrain for virtual earth is presented. The TIN surface simplification algorithm is used to construct the off-line TIN pyramid of land and sea terrain, and an efficient virtual node structure is designed to implement seamless segmentation and hierarchical block storage for all levels of TIN network. On the basis of fast retrieval and 3D scene generation of multi-scale sea-land TIN terrain using off-line TIN topographic pyramid, the cracks of TIN terrain rendering are eliminated in real time by a scheme of encode and decode of edge connection relation. Finally, the high efficiency visualization of multi-scale land and sea TIN terrain scene is realized. The experimental results show that the proposed method can significantly reduce the number of surface patches needed for surface rendering, and realize the high fidelity representation of broken terrain, such as islands, reefs and coasts, etc. It can effectively improve the defects of traditional virtual earth system such as geometric redundancy and representation distortion caused by the use of regular grid (Gird) model to map land and sea terrain.
【作者单位】： 武汉大学测绘遥感信息工程国家重点实验室;
【基金】：测绘地理信息公益性行业科研专项(201512009) 国家863计划(2012AA12A405)~~
【分类号】：P208
[Abstract]:In this paper, a method for modeling and fast visualization of the spherical surface of a multi-scale irregular triangular network (triangulated irregular network,TIN) of land and sea terrain for virtual earth is presented. The TIN surface simplification algorithm is used to construct the off-line TIN pyramid of land and sea terrain, and an efficient virtual node structure is designed to implement seamless segmentation and hierarchical block storage for all levels of TIN network. On the basis of fast retrieval and 3D scene generation of multi-scale sea-land TIN terrain using off-line TIN topographic pyramid, the cracks of TIN terrain rendering are eliminated in real time by a scheme of encode and decode of edge connection relation. Finally, the high efficiency visualization of multi-scale land and sea TIN terrain scene is realized. The experimental results show that the proposed method can significantly reduce the number of surface patches needed for surface rendering, and realize the high fidelity representation of broken terrain, such as islands, reefs and coasts, etc. It can effectively improve the defects of traditional virtual earth system such as geometric redundancy and representation distortion caused by the use of regular grid (Gird) model to map land and sea terrain.
【作者单位】： 武汉大学测绘遥感信息工程国家重点实验室;
【基金】：测绘地理信息公益性行业科研专项(201512009) 国家863计划(2012AA12A405)~~
【分类号】：P208
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