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Position: Home > Articles > STUDY ON MICROWAVE REMOTE SENSING FOR BARE AND VEGETATION-COVERED SOIL MOISTURE Acta Pedologica Sinica 1992 (3) 310-317

微波遥感裸露土壤和植被覆盖土壤含水量的研究

作  者：
赵昌龄;郝卫星;李生平;李晓红;古健康;李桂奎
单  位：
中国电波传播研究所 100101;中国科学院遥感应用研究所;中国电波传播研究所
关键词：
微波遥感;土壤含水量;微波后向散射系数
摘  要：
用X波段微波散射计研究了裸露土壤,有植被(红薯、大豆和花生)覆盖的土壤含水量与微波后向散射系数之间的关系,对X波段与C波段的结果做了分析对比。结果表明:在微波遥感裸露土壤含水量方面,入射角θ=6°时灵敏度S。最大;在θ=45°时,S_v=0;在θ>45°时,土壤含水量增大,而后向散射系数反而变小。在小入射角时,两个波段的精度相差不大。微波遥感在有植被覆盖的土壤含水量方面,X波段比C波段的灵敏度和精度要低,但是只要工作参数选择适当,就能达到一定的灵敏度和精度。应用本文提出的估算模型,X波段土壤含水量的估算误差大约为±25%左右。
译  名：
STUDY ON MICROWAVE REMOTE SENSING FOR BARE AND VEGETATION-COVERED SOIL MOISTURE
作  者：
Zhao Changling, Hao Weixing, Li Shengping and Li Xiaohong (Institute of Remote Sensing Application, Academia Sinica, 100101) Gu Jiankang, Li Guikui (China Research Institute of Radiowave Propagation)
关键词：
Microwave remote Sensing, Soil moisture, Microwave backscattering coefficient
摘  要：
In this paper, the relationship between the microwave backscattering coefficient and soil moisture of bare and vegetation (sweet potato, soybean and peanut)-covered fields is discussed, and the comparision between the results of X- and C-bands is made. The study results indicate that for microwave remote sensing of the soil moisture of bare fields, when incidence angle θ=6°, the sensitivity Sv is the maximum; when θ=45°, Sv=0; and while θ>45°, the backscattering coefficient is getting lower with the increase of soil moisture. At small incidence, X-and C-bands are quite similar in the accuracy. For microwave remote sensing vegetation-covered fields, the sensitivity and accuracy of X-band are lower than those of C-band, but X-band still has a certain sensitivity and accuracy as long as proper working parameters are selected. The prediction error of soil moisture which has been estimated by a simple model proposed in this paper is about ±25% at X-band.

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