Abstract:

Using HJ1B 30m observation as “ground truth” to calculate the percentage of snow cover for MODIS 480m cells，this paper present an algorithm for MODIS data to obtain subpixel snow cover information based on a regression relationship between MODIS 480m NDSI observation and fractional snow cover.The application of this method is tested in three regions located in Yushu，Qinghai province.The overall results indicate that the relationship between fractional snow cover and NDSI is reasonably robust with a mean absolute error less than 0.2.Fanally，based on snow cover information，this paper puts forward the
land surface temperature (LST) and normalized difference vegetation index (NDVI) as the two correlation factors related to percentage of snow cover.The analysis indicates that there is a significant negative correlation between them.Therefore，the results lays a foundation for extracting snow cover information based on multifactor