摘要
地表特征参数与下垫面特征密切相关,它是研究地表物质平衡和能量平衡的基础,因而应用遥感方法反演区域地表特征参数日益受到重视。本文主要应用现有的地表特征参数遥感反演模型,利用AVHRR和TM数据反演了黄河三角洲的地表特征参数:地表反照率、地面温度和植被指数等,并根据反演结果研究了地表特征参数及其合理组合所反映的地表特征。农田植被和天然植被的植被指数变化规律不同;在植被全覆盖区域,植被指数与反照率成幂函数关系,在极干或极湿情况下,地表温度与反照率成线性关系;地表特征参数的合理组合反映出黄河三角洲下垫面覆盖度低,裸地较多,地表较湿润,蒸发量较大。
Ground surface parameters are closely related to the ground conditions and are the foundation of inferring the regional scale evaporation and studying the surface energy exchange. Many scientists pay special attention to the methods of deriving the parameters based on remote sensing data. The ground surface parameters include the surface temperature, vegetation index and the albedo, etc. They are mainly deduced by using the AVHRR and TM data in the Yellow River Delta (YRD) in this paper. The surface parameters and their reasonable combination can give us more information on the ground conditions: (1) the change characteristics of natural vegetation NDVI (Normalized Difference Vegetation Index) are distinguished with the farm NDVI; (2) the relationship between the NDVI and the albedo is a power function in the fully covered areas by vegetation, and between the surface temperature and the albedo is a linear function in the dry or wet condition; (3) the canopy in the YRD is low; (4) the area of bare soils is big, the land surface is wet, and the evaporation is great.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2005年第2期71-75,共5页
Hydrogeology & Engineering Geology
基金
资源环境与地理信息系统北京市重点实验室开放基金
国家自然科学基金项目(40272105)
关键词
遥感
地表特征参数
地表反照率
黄河三角洲
remote sensing
surface parameters
surface albedo
the Yellow River Delta (YRD)
