FraRI:an algorithm to account for the discontinuity at 60 degrees N in MODIS temperature products

Sedda, Luigi and Morley, David W. and Benz, David and Wint, G. R. William and Wan, Zhengming and Rogers, David J. (2013) FraRI:an algorithm to account for the discontinuity at 60 degrees N in MODIS temperature products. International Journal of Remote Sensing, 34 (4). pp. 1220-1233. ISSN 0143-1161

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Abstract

The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra and Aqua satellites conducts continuous monitoring of the Earth's land surface and oceans. Recently, a sharp discontinuity (averaging 1.9 degrees C) has been noticed at 60 degrees N in both MODIS daytime and night-time land surface temperature (LST) products. This linear artefact arises because the CO2 high cloud test in the operational code for the generation of the MODIS cloud mask product is used only in the non-polar region (between 60 degrees N and 60 degrees S). The resulting discontinuity clearly has negative implications for any statistical applications of these temperature data. In this technical note we present a new algorithm, which minimizes this discontinuity. The method uses edge detection and elimination based on a mixture of Sobel and non-linear Laplacian filters (edge detection and quantification), cubic splines (edge modelling), and a controllable power function for image restoration. The implementation of this algorithm is demonstrated on an image of average minimum night-time LST between 2001 and 2008.

Item Type:
Journal Article
Journal or Publication Title:
International Journal of Remote Sensing
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900
Subjects:
ID Code:
76332
Deposited By:
Deposited On:
23 Oct 2015 08:56
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 09:26