Spectrum Similarities-Based Analysis of Spatial Difference of Snow Cover for Multi-Scale Satellite Data—a Case Study of MODIS and HJ-1B Data
LIU Yan1, LI Yang1, YANG Yun2, JIAN Ji3
1. Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China 2. College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054，China 3. Key Laboratory of Geoscience Spatial Information Technology, Ministry of Land and Resources of the P. R. China, Chengdu University of Technology, Chengdu 610059, China
Abstract：Vegetation and bare soil were collected in the areas of Miyaluo district in northwest of Sichuan province, the Qilian Mountains in Qinghai province and northern areas of Xinjiang during the years of 2007 and 2013. Then these data were converted to spectral reflectance by applying sensor response function of MODIS and HJ-1B respectively within the range of visible light, near-infrared and shortwave infrared. Comprehensive analysis was made on spectral characteristics and reflectivity similarities and differences of different sensors between old and new snowmelt, under the condition of different snow depth and different snow cover. The conclusions can be drawn. That is, there exists high consistency of spectral response between new snow and dirty snow for each sensor in the visible wavelength range, also it is true for bare soil and low vegetation. However, low consistency happens to other types of snow; especially snowmelt and frozen snow. The range of NDSI is relatively stable under the condition of different snow depth for full snow cover and the trend of NDSI shows great consistency for different sensors; NDSI threshold method for monitoring snow by using MODIS and HJ-1B data showed very obvious difference in spatial scales, which is a reasonable explanation of the existence of mixed pixels.
刘 艳1，李 杨1，杨 耘2，简 季3 . 光谱异同性和多尺度卫星雪盖差异分析——以MODIS和HJ-1B为例 [J]. 光谱学与光谱分析, 2014, 34(05): 1306-1311.
LIU Yan1, LI Yang1, YANG Yun2, JIAN Ji3 . Spectrum Similarities-Based Analysis of Spatial Difference of Snow Cover for Multi-Scale Satellite Data—a Case Study of MODIS and HJ-1B Data . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(05): 1306-1311.
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