土壤水分和干旱的遥感监测方法与教案分析.doc

目录 摘要.......................................................................................................I ABSTRACT..........................................................................................II 前言.........................................................................................1 1.1研究意义..................................................................................1 1.2旱情与干旱的概念、描述指标...............................................4 1.3干旱的危害...............................................................................5 1.4我国干旱的特点、分布状况...................................................7 1.5常用的干旱分等定级方法......................................................10 1.6目前针对干旱及土壤水分的监测方法..................................11 第二章 国内外土壤水分遥感监测研究进展情况.............................12 2.1国外遥感监测土壤水分发展状况..........................................12 2.2国内遥感监测土壤水分发展状况..........................................13 遥感监测土壤水分的理论基础.............................................15 遥感干旱监测及土壤水分监测的方法介绍.........................17 4.1 基于地表温度的遥感干旱监测方法.....................................17 4.1.1热惯量法........................................................................17 4.1.2表观热惯量植被干旱指数............................................19 4.1.3条件温度指数法............................................................20 4.1.4归一化差值温度指数....................................................20 4.2 基于植被指数的遥感干旱监测方法.......................................21 4.2.1简单植被指数..................................................................22 4.2.2比值植被指数.....................................................................22 4.2.3归一化植被指数.................................................................22 4.2.4增强植被指数.....................................................................23 4.2.5条件植被指数.....................................................................24 4.2.6距平植被指数...................................................