| Water quality change in reservoirs of Shenzhen, China: detection using LANDSAT/TM data. | |
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MedLine Citation:
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PMID: 15207584 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The objective of this research is to explore a precise and fast way of monitoring water chemical and biochemical quality in the reservoirs of Shenzhen, China. Water quality change in 1988 and 1996 are detected by synthesizing satellite data and ground-based data. One scene Thematic Mapper (TM) image in winter of 1996 was acquired and the simultaneous in situ measurement, sampling and analysis were performed. Main methods include radiometric calibration of TM remote sensor, atmospheric correction to image data and statistical model construction. The results indicate that satellite-based estimates and in situ measured water reflectance have very high correlation, and the root mean square differences between two kinds of indices are close to 0.02-0.03 for each TM band in Visible-Near Infrared (VI-NIR) range. Statistical relationship between calibrated image data (average of 5 x 5 pixels) of TM bands and laboratory analyzed data of water samples indicated reflectance of TM band 1 to band 4 and organic pollution measurements such as TOC, BOD and COD had higher correlation. The same scene TM data in the winter of 1988 was processed in the same procedure. Results indicate that water quality of most reservoirs have become worse. Water of eastern reservoirs near Dongjiang River is characterized with higher TOC and TSS, and water of western reservoirs is characterized with higher BOD and COD. |
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Authors:
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Yunpeng Wang; Hao Xia; Jiamo Fu; Guoying Sheng |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Science of the total environment Volume: 328 ISSN: 0048-9697 ISO Abbreviation: Sci. Total Environ. Publication Date: 2004 Jul |
Date Detail:
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Created Date: 2004-06-21 Completed Date: 2004-08-25 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0330500 Medline TA: Sci Total Environ Country: Netherlands |
Other Details:
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Languages: eng Pagination: 195-206 Citation Subset: IM |
Copyright Information:
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Copyright 2004 Elsevier B.V. |
Affiliation:
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State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, P.O. Box 1131, Guangzhou 510640, PR China. wangyp@gig.ac.cn |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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China Environmental Monitoring / methods* Fresh Water / analysis* Models, Statistical* Photography Radiometry Satellite Communications Sunlight Water Pollution / analysis* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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