Application of MODIS in mapping of total suspended solids in Singapore’s coastal waters

Singapore is carrying out a number of reclamation projects at Tekong Island and Tuas. In the midst of the reclamation process, the government do their due diligence to monitor the environmental quality so that the ecosystem will not be adversely impacted. This study aims at changing the water qualit...

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Main Author: Low, Yu Yao
Other Authors: Law Wing-Keung, Adrian
Format: Final Year Project
Language:English
Published: 2018
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Online Access:http://hdl.handle.net/10356/76292
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-762922023-03-03T17:07:41Z Application of MODIS in mapping of total suspended solids in Singapore’s coastal waters Low, Yu Yao Law Wing-Keung, Adrian School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering Singapore is carrying out a number of reclamation projects at Tekong Island and Tuas. In the midst of the reclamation process, the government do their due diligence to monitor the environmental quality so that the ecosystem will not be adversely impacted. This study aims at changing the water quality monitoring method by developing a regional model which can predict the Total Suspended Solids (TSS) concentrations. Field samplings were conducted in July 2018 and water samples were collected within 15 minutes of the satellite overpass time. The TSS concentrations were measured using the conventional filtration method in the laboratory. The MODIS remote sensing images (Terra MOD09GQ and Aqua MYD09GQ) were downloaded from the Earth Explorer. The MODIS Terra and Aqua remote sensing images were reprojected to the area of interest, and Band 1 and Band 2 reflectance data were extracted using SeaDAS Version 7.5. Regression analysis was performed to establish the relationship between the Total Suspended Solids (TSS) and the Remote Sensing Reflectance (Rrs). Linear, polynomial and logarithmic regression model were developed and calibrated using different input parameters. For instance, Rrs Band1, Rrs Band2, their summation, difference as well as complex ratio was analysed to predict the TSS concentrations in the Singapore’s coastal water. The accuracy of each model was indicated by R-Squared (R2) and Root-Mean-Square Error (RMSE). The algorithm having the highest R2 and lowest RMSE will be selected to be the most optimal model. The model developed using 1x1 pixel window was compared with the the model developed using 3x3 pixel window. The results suggests that using the 3x3 pixel window extraction method could produce a model with higher accuracy. The most optimal algorithm for Terra sensor is y=-254.4x^2+166.7x+2.412 whereas the most optimal algorithm for Aqua sensor is y=-20.15x^2+52.14x+1.296. The mapping software - SeaDAS Version 7.5 was also deployed to create the map of TSS in order to provide a better illustration of the water quality of the region of interest. The map developed shows that the Singapore coastal waters are of low TSS concentration and well-monitored. Bachelor of Engineering (Civil) 2018-12-17T14:40:38Z 2018-12-17T14:40:38Z 2018 Final Year Project (FYP) http://hdl.handle.net/10356/76292 en Nanyang Technological University 52 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering
spellingShingle DRNTU::Engineering::Civil engineering
Low, Yu Yao
Application of MODIS in mapping of total suspended solids in Singapore’s coastal waters
description Singapore is carrying out a number of reclamation projects at Tekong Island and Tuas. In the midst of the reclamation process, the government do their due diligence to monitor the environmental quality so that the ecosystem will not be adversely impacted. This study aims at changing the water quality monitoring method by developing a regional model which can predict the Total Suspended Solids (TSS) concentrations. Field samplings were conducted in July 2018 and water samples were collected within 15 minutes of the satellite overpass time. The TSS concentrations were measured using the conventional filtration method in the laboratory. The MODIS remote sensing images (Terra MOD09GQ and Aqua MYD09GQ) were downloaded from the Earth Explorer. The MODIS Terra and Aqua remote sensing images were reprojected to the area of interest, and Band 1 and Band 2 reflectance data were extracted using SeaDAS Version 7.5. Regression analysis was performed to establish the relationship between the Total Suspended Solids (TSS) and the Remote Sensing Reflectance (Rrs). Linear, polynomial and logarithmic regression model were developed and calibrated using different input parameters. For instance, Rrs Band1, Rrs Band2, their summation, difference as well as complex ratio was analysed to predict the TSS concentrations in the Singapore’s coastal water. The accuracy of each model was indicated by R-Squared (R2) and Root-Mean-Square Error (RMSE). The algorithm having the highest R2 and lowest RMSE will be selected to be the most optimal model. The model developed using 1x1 pixel window was compared with the the model developed using 3x3 pixel window. The results suggests that using the 3x3 pixel window extraction method could produce a model with higher accuracy. The most optimal algorithm for Terra sensor is y=-254.4x^2+166.7x+2.412 whereas the most optimal algorithm for Aqua sensor is y=-20.15x^2+52.14x+1.296. The mapping software - SeaDAS Version 7.5 was also deployed to create the map of TSS in order to provide a better illustration of the water quality of the region of interest. The map developed shows that the Singapore coastal waters are of low TSS concentration and well-monitored.
author2 Law Wing-Keung, Adrian
author_facet Law Wing-Keung, Adrian
Low, Yu Yao
format Final Year Project
author Low, Yu Yao
author_sort Low, Yu Yao
title Application of MODIS in mapping of total suspended solids in Singapore’s coastal waters
title_short Application of MODIS in mapping of total suspended solids in Singapore’s coastal waters
title_full Application of MODIS in mapping of total suspended solids in Singapore’s coastal waters
title_fullStr Application of MODIS in mapping of total suspended solids in Singapore’s coastal waters
title_full_unstemmed Application of MODIS in mapping of total suspended solids in Singapore’s coastal waters
title_sort application of modis in mapping of total suspended solids in singapore’s coastal waters
publishDate 2018
url http://hdl.handle.net/10356/76292
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