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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Linking Persistent Scatterers to the Built Environment Using Ray Tracing on Urban Models
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Linking Persistent Scatterers to the Built Environment Using Ray Tracing on Urban Models

机译：使用城市模型中的光线追踪将持久性散射体链接到建筑环境

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摘要

Persistent scatterers (PSs) are coherent measurement points obtained from time series of satellite radar images, which are used to detect and estimate millimeter-scale displacements of the terrain or man-made structures. However, associating these measurement points with specific physical objects is not straightforward, which hampers the exploitation of the full potential of the data. We have investigated the potential for predicting the occurrence and location of PSs using generic 3-D city models and ray-tracing methods, and proposed a methodology to match PSs to the pointlike scatterers predicted using RaySAR, a ray-tracing synthetic aperture radar simulator. We also investigate the impact of the level of detail (LOD) of the city models. For our test area in Rotterdam, we find that 10% and 37% of the PSs detected in a stack of TerraSAR-X data can be matched with point scatterers identified by ray tracing using LOD1 and LOD2 models, respectively. In the LOD1 case, most matched scatterers are at street level while LOD2 allows the identification of many scatterers on the buildings. Over half of the identified scatterers easily correspond to identify double or triple-bounce scatterers. However, a significant fraction corresponds to higher bounce levels, with approximately 25% being fivefold-bounce scatterers.
机译：持久散射体（PSs）是从卫星雷达图像的时间序列获得的相干测量点，用于检测和估计地形或人造结构的毫米级位移。然而，将这些测量点与特定的物理对象相关联并不是一件容易的事，这阻碍了数据全部潜力的开发。我们已经研究了使用通用3D城市模型和射线追踪方法预测PS发生和位置的潜力，并提出了一种将PS匹配到使用射线追踪合成孔径雷达模拟器RaySAR预测的点状散射体的方法。我们还将调查城市模型的详细程度（LOD）的影响。对于我们在鹿特丹的测试区域，我们发现在TerraSAR-X数据堆栈中检测到的PS的10％和37％可以分别与通过使用LOD1和LOD2模型进行射线跟踪识别的点散射器匹配。在LOD1情况下，大多数匹配的散射体都在街道上，而LOD2可以识别建筑物上的许多散射体。超过一半的已识别散射体很容易对应于识别两次或三次反弹散射体。但是，很大一部分对应于更高的反弹水平，其中大约25％是五次反弹散射体。

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