8 May 2003 Can Landsat imagery provide hi-resolution mapping of sea surface temperature in a small embayment after a convective cooling event?
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Abstract
A methodology for using Landsat data to map sea surface temperature (SST) in a small coastal embayment is explored in this paper. Following a convective cooling event at Jervis Bay, New South Wales, Australia synoptic observations of SST were made at 31 stations across the bay. These observations were used to derive a linear regression model, which compared the observations of SST to pixel values measured by Landsat 5 Band 6. The Landsat image was captured simultaneously with the SST observations. The regression equation was then used to calibrate the digital numbers of the image to degrees Celsius. Comparisons were made between the calibrated image values of SST and those simulated by an existing three-dimensional hydrodynamic model of the bay. SST in the bay ranged from 14.4°C to 17.7°C and the corresponding digital numbers of Landsat Band 6 ranged from 111 to 116. The regression equation derived was T = 0.53DN - 44.2. A comparison of the calibrated image against the numerically simulated SST indicated that the method was adequate for mapping the gross distribution of temperature across the bay. It ws found, however, that the regression model provided a resolution of only 0.5°C. Accordingly, the calibrated image failed to show a small cold water mass in the northern shallow regions of the bay, which was critical in generating the bay circulation in response to the convective cooling.
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X. H. Wang, X. H. Wang, D. J. Paull, D. J. Paull, } "Can Landsat imagery provide hi-resolution mapping of sea surface temperature in a small embayment after a convective cooling event?", Proc. SPIE 4892, Ocean Remote Sensing and Applications, (8 May 2003); doi: 10.1117/12.466072; https://doi.org/10.1117/12.466072
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