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Proceedings Paper

Improving the spatial resolution of atmospheric CH4 concentrations using MODIS-NDVI
Author(s): Xiuying Zhang; Hong Jiang; Ying Han; Yueqi Wang
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Paper Abstract

Methane (CH4) is regarded as one of the most important greenhouse gases due to its radiative forcing. Since the SCIAMACHY instrument on ENVISAT was in orbit, CH4 measurements at a regional scale became available. However, the spatial resolution of 0.5 deg latitude × 0.5 deg longitude omits many detailed spatial variations. The present study aimed to improve the spatial resolution of the retrieved atmospheric CH4 concentrations with the aid of the normalized difference vegetation index (NDVI) and land surface temperatures (LST) from MODIS with the spatial resolution of 0.05 deg latitude × 0.05 deg longitude. The gridded CH4 concentrations were firstly converted into point files, which were then divided into training and testing groups. Three methods of Ordinary Kriging, Regression Kriging, and Co-Kriging were used to simulate the spatial distribution of CH4 concentrations. The accuracy assessment showed that the Co-Kriging method combing with NDVI obtained the lowest mean predication error and root mean square prediction error. Thus, the spatially distributed atmospheric CH4 with the resolution of 0.05 deg latitude ×0.05 deg longitude was acquired.

Paper Details

Date Published: 30 October 2009
PDF: 7 pages
Proc. SPIE 7498, MIPPR 2009: Remote Sensing and GIS Data Processing and Other Applications, 74980O (30 October 2009); doi: 10.1117/12.832425
Show Author Affiliations
Xiuying Zhang, Nanjing Univ. (China)
Hong Jiang, Nanjing Univ. (China)
Zhejiang Forestry Univ. (China)
Ying Han, Nanjing Univ. (China)
Yueqi Wang, Nanjing Univ. (China)

Published in SPIE Proceedings Vol. 7498:
MIPPR 2009: Remote Sensing and GIS Data Processing and Other Applications
Faxiong Zhang; Faxiong Zhang, Editor(s)

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