合成孔径雷达在湿地制图研究方面的进展

Research Progress of Synthetic Aperture Radar in Wetland Mapping

合成孔径雷达(SAR)主动发射的雷达信号,能穿透上层植被到达水面,并可全天候获取数据,弥补了光学遥感湿地监测的不足.SAR发射信号的参数(如波长、入射角、极化方式)不同,与湿地地物相互作用的影像上表现的后向散射特征也不同,因此可从多角度获得更丰富的地物信息,但同时也增加了湿地制图的难度.文章在综述SAR湿地制图应用的基础上,总结各雷达参数对湿地地物类型分类的能力,为SAR数据的湿地制图研究提供参考依据.

Abstract： The radar signals emitted by synthetic aperture radar can penetrate upper vegetation to reach water surface, and obtain data day and night, which is a useful supplement for optical remote sensing monitoring. However, different radar parameters of signals, such as wavelength, incidence angle and polarization, are sensitive to the interaction with wetland objects. As a result, they show different backscattering characters in images, which are conductive to obtain more abundant information from more aspects, but bring difficulty to wetland mapping. Based on the review of SAR wetland mapping, the paper summarized the ability of each radar parameter to distinguish wetland objects, and provided references for wetland mapping with SAR data.