合成孔径雷达森林生物量估测研究进展

Development of Forest Biomass Estimation Using SAR Data

随着合成孔径雷达(SAR)遥感技术的发展,微波遥感独特的成像机理及其全天候全天时成像能力,使其在区域和全球森林生物量估测方面具有其它光学遥感数据不可替代的作用,这愈来愈受到科学家们的重视。首先就SAR对森林生物量的敏感性进行了论述,分别P、L和C 3 个波段及其不同极化方式总结了SAR 对森林生物量的敏感性和饱和点等反应特性;然后就SAR 对森林生物量的后向散射机理和影响森林后散射的其它因素进行了分析;最后总结了利用SAR 进行森林生物量估测的技术路线。

Along with the development of the synthetic aperture radar(SAR),microwave remote sensing with its particular imaging mechanism and the capability of acquiring data in any time, became a very important technology to estimate regional and globe forest biomass and is taking a role the other optical remote sensing data can′t replace. The scientists all over the word are paying more and more attention on it. The response characteristics of SAR data to forest biomass are discussed, which includes the sensitivity of P, L and C band, and different polarazations to forest biomass and the biomass estimation saturation points. The forest backscatter mechanism behind the response characteristics and the other factors affecting the forest backscatter behavior are analyzed. The technological route for forest biomass estimation by means of SAR data are summarized.