Research Papers

Predicting water content using linear spectral mixture model on soil spectra

[+] Author Affiliations
Huan Li

Hohai University, College of Harbor, Coastal and Offshore Engineering, Nanjing 210098, China

Nanjing Normal University, College of Geographic Science, Nanjing 210046, China

Changkuan Zhang, Zheng Gong

Hohai University, College of Harbor, Coastal and Offshore Engineering, Nanjing 210098, China

Ying Zhang, Dong Zhang

Nanjing Normal University, College of Geographic Science, Nanjing 210046, China

Jay Gao

University of Auckland, School of Environment, Auckland 1010, New Zealand

J. Appl. Remote Sens. 7(1), 073539 (Jul 08, 2013). doi:10.1117/1.JRS.7.073539
History: Received February 13, 2013; Revised May 15, 2013; Accepted May 15, 2013
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Abstract.  Remote sensing has been widely applied for soil moisture estimation. However, such estimates become difficult to obtain and can be inaccurate when applied to complex earth surfaces with more than one soil type because of the interference of spectral signals from different soil components. This study aims to develop a moisture prediction method that is insensitive to soil types; this is based on in situ samples collected from an intertidal zone in Jiangsu Province in China and on laboratory measurements of soil spectra. The results demonstrate that for a reflectance-based method, moisture content is closely related to reflectance on the three wavebands centered at 2143, 1760, and 742 nm for four types of soil (sand, silty sand, sandy silt, and silt) considered separately; the relationship is not close if all soil types are mixed together (R2=0.77). To develop the desired model, a linear spectral mixture model (LSMM) was employed to extract parameter water abundance (Wa: information on soil water content) in advance, while eliminating redundant information from other soil components. Wa has a relatively higher correlation (R2=0.82) than reflectance with moisture content for a mixed soil type. Thus, employing the LSMM helps realize a practical water content estimation model for predicting moisture over complex earth surfaces, because it has the potential of eliminating spectral effects from soil components.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Topics

Reflectivity ; Water

Citation

Huan Li ; Changkuan Zhang ; Ying Zhang ; Dong Zhang ; Jay Gao, et al.
"Predicting water content using linear spectral mixture model on soil spectra", J. Appl. Remote Sens. 7(1), 073539 (Jul 08, 2013). ; http://dx.doi.org/10.1117/1.JRS.7.073539


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