SOIL-MOISTURE AND RAINFALL ESTIMATION OVER A SEMIARID ENVIRONMENT WITH THE ESTAR MICROWAVE RADIOMETER

被引:59
作者
JACKSON, TJ
LEVINE, DM
GRIFFIS, AJ
GOODRICH, DC
SCHMUGGE, TJ
SWIFT, CT
ONEILL, PE
机构
[1] NASA,GODDARD SPACE FLIGHT CTR,MICROWAVE SENSORS BRANCH,GREENBELT,MD 20771
[2] KAMAN AEROSP CORP,TUCSON,AZ 85706
[3] UNIV MASSACHUSETTS,MICROWAVE REMOTE SENSING LAB,AMHERST,MA 01003
[4] USDA ARS,SW WATERSHED RES CTR,TUCSON,AZ 85719
[5] NASA,GODDARD SPACE FLIGHT CTR,HYDROL SCI BRANCH,GREENBELT,MD 20771
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 1993年 / 31卷 / 04期
关键词
D O I
10.1109/36.239906
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The application of an airborne electronically steered thinned array L-band radiometer (ESTAR) for soil moisture mapping was investigated over the semiarid rangeland Walnut Gulch Watershed located in southeastern Arizona. During the experiment, antecedent rainfall and evaporation were very different and resulted in a wide range of soil moisture conditions. The high spatial variability of rainfall events within this region resulted in moisture conditions with distinct spatial patterns. Analysis showed a correlation between the decrease in brightness temperature after a rainfall and the amount of rain. The sensor's performance was verified using two approaches. First, the microwave data were used in conjunction with a microwave emission model to predict soil moisture. These predictions were compared to ground observations of soil moisture. A second verification was possible using an extensive data set collected the previous year at the same site with a conventional L-band push broom microwave radiometer (PBMR). Both tests showed that the ESTAR is capable of providing soil moisture with the same level of accuracy as existing systems. ESTAR instruments have the potential to satisfy application data requirements from spaceborne platforms.
引用
收藏
页码:836 / 841
页数:6
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