SPECTRAL BEHAVIOR OF SALT-AFFECTED SOILS

被引:76
作者
RAO, BRM
SANKAR, TR
DWIVEDI, RS
THAMMAPPA, SS
VENKATARATNAM, L
SHARMA, RC
DAS, SN
机构
[1] CENT SOIL SALIN RES INST,ICAR,KARNAL 132001,PUNJAB,INDIA
[2] ALL INDIA SOIL & LAND USE SURVEY,NEW DELHI 110012,INDIA
关键词
D O I
10.1080/01431169508954546
中图分类号
TP7 [遥感技术];
学科分类号
081102 ; 0816 ; 081602 ; 083002 ; 1404 ;
摘要
For mapping and monitoring the spatial distribution of salt-affected soils using remote sensing data, a thorough understanding of their spectral behaviour is of paramount importance. The spectral behaviour of a few typical salt-affected soils of the Indo-Gangetic alluvial plain was studied by taking ground-based spectral measurements with the Exotech radiometer (model 100 EX) and measurements made by the thematic mapper (TM) onboard Landsat-5. Salt-affected soils, in general, showed relatively higher spectral response in the visible and near-infrared regions of the spectrum as compared to normal cultivated soils. Further, strongly saline-sodic soils were found to have higher spectral response as compared to moderately saline-sodic soils. The vegetation cover modifies the overall spectral response pattern of salt-affected soils especially in the green and red spectral bands. In addition, variation in the Sun elevation angle and moisture content were also found to modify the observed spectral response of salt-affected soils. Methodology and results are discussed in detail.
引用
收藏
页码:2125 / 2136
页数:12
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