机载L波段微波辐射计数据反演表层土壤水分研究

发布时间：2018-01-27 02:05

本文关键词： HiWATER PLMR 土壤水分被动微波尺度　出处：《遥感技术与应用》2017年02期 　论文类型：期刊论文

【摘要】：土壤水分是联系地球表层物质能量交换的重要纽带,准确监测土壤水分对区域气候、生态、水文及农业生产研究意义重大。机载L波段微波辐射计提供了获取区域土壤水分"真值"的有效手段。结合黑河中游航空试验中的多源遥感及地面观测,发展了一种基于0°入射角的L波段被动微波亮温数据的单通道土壤水分反演方法,获得了研究区3景约700m空间分辨率的土壤水分反演结果。并对其反演结果进行了点尺度、面尺度和村社尺度3种不同空间尺度上的验证,结果显示:L波段被动微波遥感反演土壤水分在点尺度上的验证精度在0.035~0.055m3/m3之间;面尺度上验证精度略高于点尺度,其验证偏差在0.02m3/m3以内;反演土壤水分与村社尺度的灌溉数据,即距前次灌溉的间隔日数,在空间上负相关关系明显,二者间相关系数约为0.3。
[Abstract]:Soil moisture is an important link to contact the energy exchange of the earth's surface material. It can accurately monitor the regional climate and ecology of soil moisture. The research on hydrology and agricultural production is of great significance. The airborne L-band microwave radiometer provides an effective means to obtain the "true value" of regional soil moisture, combined with multi-source remote sensing and ground observation in the aeronautical test in the middle reaches of Heihe River. A single channel soil moisture inversion method based on L-band passive microwave bright temperature data based on 0 掳incident angle is developed. The results of soil moisture inversion with spatial resolution of about 700m in 3 scenes in the study area were obtained, and the inversion results were verified on three different spatial scales: point scale, surface scale and village scale. The results show that the verification accuracy of passive microwave remote sensing inversion of soil moisture at the point scale is 0.035 ~ 0.055 m ~ 3 / m ~ 3; The accuracy of verification is slightly higher than that of point scale, and the verification deviation is within 0.02m3 / m3; The inverse correlation between soil moisture and irrigation data of village scale, that is, the number of interval days from the previous irrigation, is obviously negatively related in space, and the correlation coefficient between them is about 0.3.
【作者单位】：中国科学院西北生态环境资源研究院;中国科学院大学;中国科学院西北生态环境资源研究院黑河遥感试验研究站;
【基金】：国家自然科学基金项目(41271087) 国家973计划项目(2013CBA01802)共同资助
【分类号】：S152.7;TP79
【正文快照】： 3.中国科学院西北生态环境资源研究院黑河遥感试验研究站,甘肃兰州730000)1引言土壤水分,通常定义为地表以下土壤包气带中的水分,也叫非饱和带土壤水分,是联系地球表层物质能量交换的重要纽带[1],在全球水循环、能量平衡以及气候系统中影响重大,并且作为陆地生态系统水循环体

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