基于极化方向角的地形坡度的估计

Estimation of Terrain Slope Based on Polarization Orientation Angle

SAR数据处理中,地形坡度信息是重要的地形参数。利用SAR影像提取地形坡度的主要方法分为雷达干涉测量(InSAR)和雷达极化(PolSAR)测量,其中雷达极化测量包含正交双轨道全极化SAR测量和单轨道全极化SAR测量。文章结合极化方向角及Lambertian后向散射模型得到的距离向坡度与方位向坡度之间的关系,从而反演方位向与距离向坡度。实验选取了覆盖青海省治多县的两景全极化ALOS-PALSAR数据进行实验。结果表明:反演得到的地形坡度与利用InSAR技术得到的地形坡度能较好地吻合。

Terrain slope information is an important topographic parameter. The main methods for extracting terrain slope by using SAR image include Interferometric SAR（InSAR） and Polarimetric SAR（PolSAR）. Where PolSAR method includes two orthogonal track fully polarimetric SAR and single-track fully polarimetric SAR. In this paper,we use Polari- metric orientation angle combining with Lambertian backscattering model to inverse the azimuth slope and the range slope. We select two full polarimetric ALOS-PALSAR images covered Zhiduo County, Qinghai, China for experiments. The results show that the inversed terrain slopes are consistent with the slopes abtained by using InSAR method.