单时相NOAA/AVHRR资料监测大范围土壤含水量的研究  

A Study on Monitoring Large-scale Soil Moisture by Using Single Phase NOAA/AVHRR Image

作　　者：陈巧[1] 陈永富[1] 

机构地区：[1]中国林业科学研究院资源信息研究所,北京100091

出　　处：《林业科学研究》2004年第4期427-433,共7页Forest Research

基　　金：国家重点公益性研究项目"沙尘暴监测技术"(项目编号:17)

摘　　要：本文利用NOAA AVHRR资料,考虑地表温度和地表反射特征,分别不同时期、不同土层深度、不同地表覆盖特征、不同方法和不同函数进行拟合,结果表明:用单时相1通道反射率与4通道亮温的乘积值直接与土壤湿度建模的方法优于其它建模方法;其直线函数为最理想的拟合函数,且同一土层不同时间段的模型之间具有可替代性,并通过了置信度0 01的F显著性检验,其相对误差基本控制在20%以内。该方法还解决了以往不能连续监测土壤含水量、监测范围小的不足,资料获取方便,并且适合任意植被覆盖下大范围的土壤湿度监测。Taking the soil surface temperature and reflectance into account,NOAA/AVHRR data were fitted with the soil temperature based on different period,soil depth,land cover types,methods and regression functions.The results showed that the method built by the product of reflectance of channel 1 and brightness temperature of channel 4 of single phase NOAA/AVHRR was better than that of other methods.Its linear function was the best function fitted.It was replaceable for the models with different periods at the same soil depth.The method had passed the significant level of F<0.01 and in general its relative error was less than 20% on the whole.This method also solved the disadvantages of traditional methods that couldn't monitor soil moisture continuously and could only monitor at small scale.Furthermore,the data could be acquired easily,and the method was suited to monitor soil moisture at large scale with any level of vegetation cover.

关 键 词：AVHRR资料 单时相乘积法 任意植被覆盖 土壤含水量 

分 类 号：S152.7[农业科学—土壤学]