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Remote Sensing Technology and Application  2012, Vol. 27 Issue (5): 746-753    DOI: 10.11873/j.issn.1004-0323.2012.5.746
    
A Study on Snow Cover Variability Using MODIS in the Typical Area of Tianshan Mountains,China
Zhang Wenbo,Xiao Pengfeng,Feng Xuezhi
(Department of Geographic Information Science,Nanjing University,Nanjing 210093,China)
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Abstract  

Monitoring the extent and duration of snow cover in Tianshan mountains is significant for fully utilizing water resources and understanding the regional impact of climate change.Daily MODIS snow cover data can provide a basis for large scale snow cover mapping.However,the high cloud obscuration limits its applications.This study uses a four-step approach to remove cloud from the daily data.Using improved MODIS snow cover data and DEM analyse the spatial and temporal variability of snow cover extent and duration from 2002 to 2009 in the Tianshan Mountains of China.Snow cover extent is closely related to terrain factors.The snow cover frequency as a whole becomes higher with increasing altitude.The ratio of snow cover is higher at the northwest,north and west aspect than that at the south and southeast aspect.The snow cover extent of the whole area is small from 2006 to 2008.Maximum snow cover extent increases yearly on average.The regions snow cover duration exceeds 200 days,which are mainly in the high-altitude perennial snow cover areas,and their Coefficient of Variation (COV) is low.The snow cover duration in the southern Tianshan mountains and other low-altitude areas is very short,and change substantially due to seasonal climate situations.

Key words:  MODIS snow cover data      Cloud removal method      Snow cover extent      Snow cover duration      Tianshan mountains     
Received:  04 November 2011      Published:  17 October 2012
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Cite this article: 

Zhang Wenbo,Xiao Pengfeng,Feng Xuezhi. A Study on Snow Cover Variability Using MODIS in the Typical Area of Tianshan Mountains,China. Remote Sensing Technology and Application, 2012, 27(5): 746-753.

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http://www.rsta.ac.cn/EN/10.11873/j.issn.1004-0323.2012.5.746     OR     http://www.rsta.ac.cn/EN/Y2012/V27/I5/746

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