Progressive Transmission of 3D Building Models based on String Grammars and Planar Half-Spaces
Progressive Transmission of 3D Building Models based on String Grammars and Planar Half-Spaces
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DOI：
10.5194/isprsannals-ii-2-9-2014
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发表时间：
2014-11
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影响因子：
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通讯作者：
M. Kada
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文献类型：
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作者：
M. Kada
由于3D城市模型有许多应用，对几何精度和粒度有广泛的模型要求，因此对不同细节层次（LOD）的模型也有很高的要求。虽然它们的重建和制图综合已经得到了广泛的研究，特别是在三维建筑模型方面，但它们的渐进存储和传输编码至今还没有得到深入的探索和充分的解决。大多数情况下，在不同的lod上构建模型被认为是相互不相关的离散实体。本文提出了一种三维建筑模型的渐进式编码和传输方案，该方案对最终用户来说易于理解和实现，对模型制作者来说具有灵活性和可扩展性。渐进式方案基于字符串语法，并将连续的lod序列描述为一组动态的产生规则。为了限制LOD变化对渐进字符串表示的局部范围的影响，我们使用基于平面半空间的实体建模方法来构建3D建筑物。文中给出了这种递进字符串语法的生成，并给出了实例。
As there are numerous applications for 3D city models with a wide range of model requirements regarding geometric accuracy and granularity, there is also a high demand for such models at different levels of detail (LOD). And although their reconstruction and cartographic generalization has been widely studied, particularly with regard to 3D building models, their encoding for a progressive storage and transmission is up to now not profoundly explored and sufficiently solved. Most often building models at different LODs are considered as discrete entities that are not related to each other. In this paper we present a progressive encoding and transmission scheme for 3D building models that is easy to understand and implement for the end user as well as flexible and extensible for the model producer. The progressive scheme is based on string grammars and describes a sequence of successive LODs as a dynamic set of production rules. In order to restrict the effects of LOD changes on a local range of the progressive string representation, we use a solid modelling approach based on planar half-spaces to construct 3D buildings. The generation of such progressive string grammars is shown and examples are given.