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Proceedings Paper

Water quality mapping using remote sensing technique in Penang Straits, Malaysia
Author(s): H. S. Lim; M. Z. MatJafri; K. Abdullah; A. N. Alias; N. Mohd. Saleh
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Paper Abstract

The application of remote sensing to assess water quality for coastal and open ocean has escalated recently due to its capability of scanning wide water bodies within a short time period. In this paper, we examined the spatial variability of chlorophyll within Penang straits, Malaysia. Coastal and estuarine ecosystems typically exhibit high temporal and spatial variability in phytoplankton biomass that is often too difficult to characterize with a limited set of in situ shipboard measurements. In this study, we used ALOS satellite imagery acquired on 24 April 2007. An algorithm for retrieval of chlorophyll level was developed for ALOS data. Chlorophyll samples were collected using a small boat simultaneously with the acquisition of the satellite image. The water locations were determined using a handheld Global Positioning System (GPS). And then the digital numbers for each band corresponding to the sea-truth locations were extracted and then converted into radiance values and reflectance values. The reflectance values were used for calibration of the chlorophyll algorithm. For the regression model, the correlation coefficient (R) and the root-mean-square deviation (RMS) were noted. The proposed algorithm is considered superior based on the values of the correlation coefficient and root-mean-square The water quality image was generated using the multispectral data set and the proposed calibrated TSS algorithm. This study demonstrates that remote sensing can play an important role in water quality assessment by using high resolution satellite image of ALOS data.

Paper Details

Date Published: 13 October 2008
PDF: 7 pages
Proc. SPIE 7105, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2008, 71050A (13 October 2008); doi: 10.1117/12.800573
Show Author Affiliations
H. S. Lim, Univ. Sains Malaysia (Malaysia)
M. Z. MatJafri, Univ. Sains Malaysia (Malaysia)
K. Abdullah, Univ. Sains Malaysia (Malaysia)
A. N. Alias, Univ. Sains Malaysia (Malaysia)
N. Mohd. Saleh, Univ. Sains Malaysia (Malaysia)


Published in SPIE Proceedings Vol. 7105:
Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2008
Charles R. Bostater; Stelios P. Mertikas; Xavier Neyt; Miguel Velez-Reyes, Editor(s)

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