Analysis of VNIR (400–1100 nm) spectral signatures for estimation of soil organic matter in tropical soils of Thailand
- 1 February 2004
- journal article
- research article
- Published by Informa UK Limited in International Journal of Remote Sensing
- Vol. 25 (3), 643-652
- https://doi.org/10.1080/0143116031000139944
Abstract
The widely available laboratory spectrometers detect targets at spectral regions restricted to visible and near-infrared (VNIR). The spectral response of soils in this region is predominantly featureless and obstructs the exploitation of absorption features as diagnostic criterion. In this study, polynomial based modelling was developed as an alternative method of estimating soil organic matter (OM) from VNIR spectral region. Forty-one core samples, collected from Lop Buri, Thailand, were subjected to chemical and radiometric analysis. Computations were made across four categories of synthesized bandwidths. The selection procedure identified bands at 960, 1100 and 520 nm as OM sensitive. The widening interval of bandwidth has corresponded with diminishing predictive power, termed ‘bandwidth decay effect’. The use of polynomial models and their validations showed a higher performance than the analysis made with multiple regressions analysis. The polynomial based approach offers a fresh opportunity for modelling other non-photoactive soil nutrient parameters. Furthermore, it may form the basis for integration of spectrometers and satellite sensors, aimed at mapping of non-vegetated soils.Keywords
This publication has 21 references indexed in Scilit:
- Relating soil surface moisture to reflectanceRemote Sensing of Environment, 2002
- Development of Reflectance Spectral Libraries for Characterization of Soil PropertiesSoil Science Society of America Journal, 2002
- Mapping of several soil properties using DAIS-7915 hyperspectral scanner data - a case study over clayey soils in IsraelInternational Journal of Remote Sensing, 2002
- Plant Litter and Soil ReflectanceRemote Sensing of Environment, 2000
- Spectral Vegetation Indices as Nondestructive Tools for Determining Durum Wheat YieldAgronomy Journal, 2000
- Role of organic matter in obliterating the effects of iron on spectral reflectance and colour of Brazilian tropical soilsInternational Journal of Remote Sensing, 1998
- Bi-directional reflectance factor of 14 soil classes from BrazilInternational Journal of Remote Sensing, 1995
- Visible and near-infrared (0.4–1.1 μm) analysis of arid and semiarid soilsRemote Sensing of Environment, 1994
- Modeling spectral and bidirectional soil reflectanceRemote Sensing of Environment, 1992
- Assessment of biophysical soil properties through spectral decomposition techniquesRemote Sensing of Environment, 1991