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Journal of Applied Remote Sensing

Determining soil water content of salt-affected soil using far-infrared spectra: laboratory experiment
Author(s): Lu Xu; Zhichun Wang; Maina John Nyongesah; Gang Liu
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Paper Abstract

Rapid determination of soil water content is urgently needed for monitoring and modeling ecosystem processes and improving agricultural practices, especially in arid landscapes. Far-infrared band application in soil water measurement is still limited. Various samples were arranged to simulate complex field condition and emissivity was obtained from a Fourier transform infrared spectrometer. Four spectral forms (including raw spectra, logarithm of reciprocal spectra, first-order derivate, and second-order derivate) were employed to develop a partial least squares regression model. The results indicate that the model with first-order derivate spectral form was identified with the highest performance (R2=0.87 and root mean square error=1.88%) at the range of 8.309 to 10.771  μm. Judging from the contribution of the bands to each principal component, the band region from 8.27 to 9.112  μm holds a great promise for soil water content estimation. Several channels of ASTER and MODIS correspond to the involved band domain, which show the potential of predicting and mapping soil water content on large scales. However, there are still constraints due to the differences in spectral resolution between instrument and sensors and the influence of complex factors under field conditions, which are still challenges for forthcoming studies.

Paper Details

Date Published: 9 December 2015
PDF: 15 pages
J. Appl. Rem. Sens. 9(1) 095983 doi: 10.1117/1.JRS.9.095983
Published in: Journal of Applied Remote Sensing Volume 9, Issue 1
Show Author Affiliations
Lu Xu, Xinjiang Institute of Ecology and Geography (China)
Chinese Academy of Sciences (China)
Univ. of Chinese Academy of Sciences (China)
Zhichun Wang, Northeast Institute of Geography and Agroecology (China)
Chinese Academy of Sciences (China)
Maina John Nyongesah, Jaramogi Oginga Odinga Univ. of Science and Technology (Kenya)
Gang Liu, Shizuoka University (Japan)

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