Soil water content measurement using hyper-spectral remote sensing techniques – A case study from north-western part of Tamil Nadu, India
2019
Divya, Y. | Gopinathan, P.
This study examines the hyperspectral signatures (in the visible near-infrared (VNIR)–shortwave infrared (SWIR) regions of different samples of soils possessing varying water content. Totally 82 soil samples with differing water contents were examined using a hyperspectral radiometer operating in the 350–2,500-nm range, and the spectral curves were obtained. Statistical analyses (linear regression and Pearson R) of the curves indicate that overall reflectance increases with decreasing water content in the sample within the saturation limit. ‘Depth at 1400 nm region’ as a dependable spectral parameter since there exists a good correlation compared to other parameters. Further the depth of absorption at 1400 nm region correlates well with water content even when the water content crosses the saturation limit. Based on these well-defined relations, it is inferred that hyperspectral radiometry in the VNIR and SWIR regions can be used to estimate the water content of soils.
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