FY3-B土壤湿度监测产品在藏北草原的精度验证  

Precision Test of FY3-B/MWRI Soil Moisture Monitoring Products in Northern Tibet Grassland

作　　者：袁雷[1] 

机构地区：[1]西藏自治区气候中心,西藏拉萨850000

出　　处：《贵州农业科学》2017年第10期134-138,共5页Guizhou Agricultural Sciences

基　　金：西藏自治区科技计划项目"高原气候与灾害防治技术";中国气象局气候变化专项"藏北地区土壤温度-湿度的变化特征研究"(CCSF201515);中国气象局气候变化专项"气候变化对西藏冬虫夏草气候适宜性的影响评价"(CCSF201610)

摘　　要：为供藏北草原区土壤湿度的遥感监测参考,利用2014年7月至2015年8月的藏北草原野外试验数据,对国家卫星气象中心的FY3-B/MWRI日土壤湿度产品进行精度验证。结果表明:地面土壤湿度实测值和MWRI土壤湿度反演值两者的平均值相差0.03cm^3/cm^3,平均土壤湿度较接近,并且两者时间序列趋势变化相同,虽然均方根误差(RMSE)为0.14,但相关性R2达0.459 7。各测量点地面土壤湿度和MWRI土壤湿度反演值变化规律略有差别,但趋势相同,地面实测值与MWRI反演值的相关性在各测量点上较好,最差的R2也达0.48。The precision of FY3-B/MWRI Soil Moisture Monitoring Products from National Satellite Meteorological Center is tested by using the field test data of Northern Tibet grassland in August,2014 and July,2015 to provide a reference for remote sensing monitoring of soil moisture in Northern Tibet grassland.Results:The difference between the average measured value of surface soil moisture and average retrieval value of MWRI soil moisture is 0.03 cm^3/cm^3,which indicates that the average soil moisture of the measured value and retrieval value from MWRI is close.Both time-series trend variation is the same.The correlation(R2)between the measured value and retrieval value from MWRI is up to 0.459 7 although the root-mean-square-error is 0.14.There is a slight difference in variation rule of the measured value of surface soil moisture and retrieval value from MWRI at different measuring points and their trend is the same.The correlations between the measured value and retrieval value from MWRI at different measuring points is very good and the worst correlation coefficient(R2)can reach 0.48.

关 键 词：MWRI 土壤湿度产品 藏北 精度验证 

分 类 号：S126[农业科学—农业基础科学]