Journal
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
Volume 19, Issue -, Pages 196-204Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jag.2012.05.008
Keywords
Quantifying biomass; Nitrogen concentration, and nitrogen density; Vegetation indices; Band depth analysis parameters
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Funding
- higher education commission (HEC) of Pakistan
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This study aimed to investigate the potential of MERIS in estimating the quantity and quality of a grassland using various vegetation indices (NDVI, SAVI, TSAVI, REIP, MTCI and band depth analysis parameters) at a regional scale. Green biomass was best predicted by NBDI (normalised band depth index) and yielded a calibration R-2 of 0.73 and a Root Mean Square Error (RMSE) of 136.2 g m(-2) (using an independent validation dataset, n=30) compared to a much higher RMSE obtained from soil adjusted vegetation index SAVI (444.6 g m(-2)). Nitrogen density was also best predicted by NBDI and yielded a calibration R-2 of 0.51 and a RMSE of 4.2 g m(-2) compared to a relatively higher RMSE obtained from MERIS terrestrial chlorophyll index MTCI (6.6 g m(-2)). For the estimation of nitrogen concentration (%), band depth analysis parameters showed poor R-2 of 0.21 and the results of MTCI and REIP were statistically non-significant (P>0.05). It is concluded that band depth analysis parameters consistently showed higher accuracy than vegetation indices, suggesting that band depth analysis parameters could be used to monitor grassland condition over time at regional scale. (C) 2012 Elsevier B.V. All rights reserved.
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