云贵高原典型地物L波段SAR散射特性分析——以昆明为例

L-band SAR scattering characteristic analysis of typical features in Yunnan-Guizhou plateau: a case study of Kunming

高分光学遥感在典型地物分类研究中已开展很多,但受限制于多云雾覆盖、多雨的低纬度地区。合成孔径雷达可穿透云雾、植被冠层,被引入典型地物分类中。本研究以L波段HH、HV双极化2景高分辨率ALOS-2 PALSAR-2遥感影像为主要数据源,开展了低纬亚热带高山地昆明地区的建筑物、林地、耕地、湿地、深水等五类典型地物的极化后向散射特性分析实验研究。实验结果表明:五类典型地物的HH、HV极化散射特性基本不受升降轨侧视成像、季节性影响;五类典型地物样本点的HH、HV极化后向散射空间特征较为明显。实验结果有力证明了HH、HV双极化SAR具有多云雾、低纬亚热带地区典型地物分类、反演及动态监测的应用潜力,可作为光学或热通道遥感开展地物监测的有效补充手段。

High-resolution optical remote sensing has been widely used in the classification of classical terrain features,but limited in low latitude region with cloudy,foggy and rainy weather.Synthetic Aperture Radar(SAR)can penetrate clouds,fogs and vegetation canopy and has applied into the classification of classical terrain features.Taking L-band HH and HV bipolar two-scene high-resolution ALOS-2 PALSAR-2 images as main data sources,the polarized backscattering characteristics of five classical terrain features in Kunming region such as buildings,forests,farmlands,wetlands and deep water were analyzed.The experiment results show that:(1)The HH and HV polarized backscattering characteristics of five classical terrain features are generally irrelevant with ascend-orbit or descend-orbit side-look imaging and seasonality.(2)The spatial HH and HV polarized characteristics of five classical terrain features are relatively apparent.(3)The experiment results strongly prove that HH and HV bipolar SAR has potential applications in classification,inversion and dynamic monitoring of classical terrain features in low latitude regions and subtropical regions,and can be used as an effective supplementary means of optical or thermal channel remote sensing for terrain monitoring.