Retrieval of suspended sediment concentration in near-shore coastal waters using MODIS data : a thesis presented in partial fulfilment of the requirements for the degree of Master of Philosophy in Earth Science at Massey University, Palmerston North, New Zealand
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Date
2012
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Massey University
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Abstract
This study focuses on using remote sensing satellite data to retrieve water suspended sediment concentration (SSC) of near-shore coastal waters. Aqua/Terra Satellite MODIS 250m data of the south-western coast of the North Island, New Zealand was used. Two methods of analysis are used in this study to obtain an SSC map; non-liner optimisation and quasi-analytical.
The non-linear optimisation method was used to fit an exponential function between reflectance and SSC, with SSC replaced by a linear relationship between SSC and reflectance in the near infrared domain. The optimisation result was used to convert Aqua/Terra MODIS images to SSC maps.
The quasi-analytical method, a backscattering coefficient at 645nm is first derived from Aqua/Terra MODIS 250m Band 1 data using a quasi-analytical algorithm after applying a simple atmospheric correction routine. An empirical relationship was derived from laboratory experiments. Finally SSC maps were obtained by applying the empirical relationship to convert the backscattering coefficient to SSC.
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Keywords
Remote sensing, Suspended sediments, Coastal sediments, MODIS, New Zealand coast, Suspended sediment concentration maps