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Estimation of chlorophyll-a concentration and trophic states in Nalban Lake of East Kolkata Wetland, India from Landsat 8 OLI data

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Title Estimation of chlorophyll-a concentration and trophic states in Nalban Lake of East Kolkata Wetland, India from Landsat 8 OLI data
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Creator Pulak Priti Patra
Sourabh Kumar Dubey
Raman Kumar Trivedi
Sanjeev Kumar Sahu
Sangram Kesharile Rout
 
Subject Chlorophyll-a prediction
East Kolkata Wetland
Landsat 8 OLI
 
Description Not Available
Landsat operational land imager (OLI) data and consequent laboratory measurements were used to predict chlorophyll-a (Chl-a) concentration and the trophic states for an inland lake within the East Kolkata Wetland, India (a Ramsar site). The most suitable band ratio was identified by performing Pearson correlation analysis between Chl-a concentrations and possible OLI band and band ratios from the study points. The results showed highest correlation coefficient from the band ratio OLI5/OLI4 with an R value of 0.85. The prediction model was then developed by applying regression analysis between the band ratio OLI5/OLI4 and Chl-a concentration of the study points. The reflectance ratios of the validation points were given as input on the prediction model and the model output was considered as predicted Chl-a values of the validation points to check the efficiency of the prediction model. The regression model between laboratory-derived Chl-a value and model-fitted Chl-a value of the validation points revealed a high correlation with an R² value of 0.78. Trophic State Index (TSI) of the lake was also calculated from laboratory-derived Chl-a value and model-fitted Chl-a value of the validation points. The study presented a high correlation of TSI determined from predicted data with TSI from laboratory reference data (R = 0.88). The TSI values of the lake ranged from 65 to 75 which indicate that the lake is appeared to be eutrophic to hypereutrophic conditions. This empirical study showed that Landsat 8 OLI imagery can be effectively applied to estimate Chl-a levels and trophic states for inland lakes
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Date 2018-10-10T09:31:07Z
2018-10-10T09:31:07Z
2017-02-01
 
Type Research Paper
 
Identifier Patra, Pulak Priti, Dubey, Sourabh Kumar , Trivedi, Raman Kumar, Sahu, Sanjeev Kumar and Rout,Sangram Keshari( 2017) Estimation of chlorophyll-a concentration and trophic states in Nalban Lake of East Kolkata Wetland, India from Landsat 8 OLI data, Spatial Information Research,Volume 25(1) pp 75–87
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http://krishi.icar.gov.in/jspui/handle/123456789/7701
 
Language English
 
Relation Not Available;
 
Publisher Korean Spatial Information Society