Abstract
The present study's goal is to evaluate surface water quality using integrated techniques of remote sensing, geographic information systems (GIS), and the Internet of Things (IoT). The Landsat 9 operational land image (OLI) was downloaded from Earth Explorer on February 5, 2023, and water sampling was conducted along the Vaigai River in Madurai, Tamil Nadu, India, on the same day. To verify the accuracy of the IoT and remote sensing data, 14 samples were taken at random from various locations in Vaigai and studied in a laboratory. At the same areas where samples were taken for in situ analysis, along the Vaigai River, pH and TDS sensors were utilized to measure the values. This study establishes the applicability of Landsat 9 and regression analysis for estimating the water quality parameters such as pH, total dissolved solids (TDS), nitrates (NO3), ammonia (NH3), electrical conductivity (EC), sodium (Na), calcium (Ca), potassium (K), and biochemical oxygen demand (BOD) through the correlation between Landsat 9 bands and in situ measurements. The outcomes of the regression analysis demonstrate a strong correlation between the Landsat 9 OLI band 1 reflectance values and the water quality indices of NO3, NH3, and BOD. TDS and band 3 reflectance levels had a strong correlation. Band 4 reflectance values of Landsat 9 OLI were well associated with the remaining parameters of pH, EC, Na, Ca, and K. The in situ and IoT analysis of sample data best matches the estimated values of water quality parameters based on regression analysis. Therefore, this integrated technique is a powerful platform compared to conventional methods for analysing and processing big data and remotely mapping geographic areas with greater accuracy and speed. This study advises researchers to use the methods of remote sensing, GIS, and IoT to accurately estimate future challenges connected to water quality assessments. Future research will continuously collect more water samples and water quality metrics from inland waters in various situations to increase the generalizability of the models in order to achieve integration.
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The authors would like to thank Mepco Schlenk Engineering College to provide the necessary laboratory facilities for analysing water samples.
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SPR contributed to conceptualization, methodology, interpretation of results, and writing—original draft preparation; NM performed water quality parameters interpretation and analysis in GIS environment, and statistical analysis; MN was involved in collecting water sample, laboratory analysis, writing, and IOT work; VSM was involved in writing—reviewing and editing, data collection, satellite image works, band comparison and IOT; TPK contributed to data collection, laboratory analysis, and fieldwork.
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Rajaveni, S.P., Muniappan, N., Nandhu, M. et al. Assessment of Surface Water Quality Based on Landsat 9 Operational Land Imager Combined with GIS and IOT. J Indian Soc Remote Sens 52, 139–151 (2024). https://doi.org/10.1007/s12524-023-01795-w
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DOI: https://doi.org/10.1007/s12524-023-01795-w