As one of the most active elements in nature, snow cover is an important parameter in studying climatic variations,
surface radiation budget (SRB) and hydrology cycle. Complementary to ground-based station data, satellite time series
provide a systematic view of snow cover over large spatial scale. Before the year 2000, only NOAA-AVHRR data
provides the opportunity to analyze more than 15 years of optical satellite imagery on a high time-resolution basis. Long
Term Data Record (LTDR) funded by National Aeronautics and Space Administration (NASA) offers the latest data sets
with improved atmospheric correction and inter-calibration between sensors, which has not been tested in snow cover
determination. Taking the Tibetan Plateau (TP) as the study area, we applied an adequate algorithm to develop long-term
8-day cloud-free snow cover products (1983-1999) using AVHRR archival reflectance products (AVH09C1) from
LTDR. Here, we added the altitude and the influence of seasonal variations to the algorithm as the two additional
parameters. To certain the threshold of brightness temperature(BT), we calculated the correlation between brightness
temperature and the two additional parameters in supervised snow area. Then Landsat Thematic Mapper (TM) data and
the meteorological station data from 1983~1999 were utilized to test the accuracy of our products. Based on these
products, we carried on a preliminary analysis on seasonal distribution of snow cover during 1983~1999.
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