AN INTERPRETATION OF METHODOLOGIES FOR INDIRECT MEASUREMENT OF SOIL-WATER CONTENT

被引:239
作者
CARLSON, TN
GILLIES, RR
SCHMUGGE, TJ
机构
[1] PENN STATE UNIV,CTR EARTH SYST SCI,UNIVERSITY PK,PA 16802
[2] USDA ARS,HYDROL LAB,BELTSVILLE,MD 20705
基金
美国国家航空航天局;
关键词
D O I
10.1016/0168-1923(95)02261-U
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Using a new technique referred to as the triangle method, surface soil water content and fractional vegetation cover were derived from surface radiant temperature measurements and normalized difference vegetation index (NDVI). Application of the technique is made with reference to NS001 multispectral scanner measurements made by a C-130 aircraft over the Mahantango Watershed in Pennsylvania. The derived surface soil water content values were compared with those obtained from the Push Broom Microwave Radiometer (PBMR) aboard the same aircraft and with in-situ ground measurements, A large disparity was found to exist between all three measurements, suggesting that the surface becomes decoupled from the deeper substrate in regions of rapid drying, where large vertical gradients in soil water content may exist near the surface.
引用
收藏
页码:191 / 205
页数:15
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