Directional analysis of SAR images aiming at wind direction
Directional analysis of SAR images aiming at wind direction
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DOI：
10.1109/tgrs.2003.818811
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发表时间：
2004-04-01
影响因子：
8.2
通讯作者：
Koch, W
中科院分区：
文献类型：
--
作者：
Koch, W
目前，从合成孔径雷达（SAR）图像中提取风场存在着风向信息不足的问题。最先进的光谱分析在公海上工作得很好，但空间分辨率有限。本文描述的方法是基于用标准图像处理算法计算的局部梯度。它处理的图像特征不是由风引起的，可以应用于不规则形状的区域。该方法已应用于欧洲遥感卫星sar和RADARSAT-1扫描sar的许多图像，通常提供合理的风场。最常用的空间采样是20 × 20和10 × 10 km(2)。在某些情况下，对低至1 x 1 km(2)的样品进行了测试。本文介绍了局部梯度法，包括非风生成图像特征的滤波，并给出了应用实例。
Currently, the retrieval of wind fields from synthetic aperture radar (SAR) images suffers from inadequate knowledge of the wind direction. State-of-the-art spectral analysis works fine on open seas, but is limited in spatial resolution. The method described here is based on the local gradients computed with standard image processing algorithms. It handles image features not caused by wind and can be applied to irregularly shaped regions. The new method has already been applied to many images from the European Remote sensing Satellite SARs and RADARSAT-1 ScanSAR, usually supplying reasonable wind fields. The spatial sampling most frequently used was 20 x 20 and 10 x 10 km(2). In some cases, samplings down to 1 x 1 km(2) were tested. This paper describes the local gradients method including the filtering of nonwind generated image features and gives some application examples.