论文部分内容阅读
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。
Soil moisture is an important link in energy exchange with the Earth’s surface material. Accurately monitoring soil moisture is of great significance to the research on climate, ecology, hydrology and agricultural production in the region. Airborne L-band microwave radiometers provide an effective means of obtaining “true” soil moisture in the area. Based on the multi-source remote sensing and ground observation in the middle reaches of the Heihe River, a single-channel soil moisture retrieval method based on the L-band passive microwave brightness temperature data of 0 ° incident angle was developed. The spatial resolution of about 700 m Rate of soil moisture inversion results. The inversion results were validated on three different spatial scales: point scale, surface scale and village scale. The results show that the verification accuracy of the L-band passive microwave remote sensing data at the point scale is 0.035 ~ 0.055m3 / m3; validation accuracy is slightly higher than the point scale in surface scale, and the verification deviation is less than 0.02m3 / m3; the data of inversion of soil moisture and village scale, that is, the interval days from the previous irrigation, are spatially The negative correlation is obvious, the correlation coefficient between the two is about 0.3.