Snow Grain-Size Estimation Over Mountainous Areas From MODIS Imagery

Snow in mountainous areas is a major source of surface water and groundwater recharge in the world. The water balance in mountainous regions is controlled by the interactions between the climate, cryospheric, and hydrological systems. Surface snow grain is a sensitive thermodynamic indicator of snow...

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Bibliographic Details
Published in:IEEE geoscience and remote sensing letters 2018-01, Vol.15 (1), p.97-101
Main Authors: Wang, Jiangeng, Feng, Xuezhi, Xiao, Pengfeng, Ye, Nan, Zhang, Xueliang, Cheng, Yinyi
Format: Article
Language:English
Subjects:
Ablation
Adaptive optics
Albedo
Albedo (solar)
Grain size
Groundwater
Groundwater recharge
Hydrology
Imagery
Imaging techniques
In situ measurement
Interactions
Moderate Resolution Imaging Spectrometer (MODIS)
MODIS
Mountain regions
Mountainous areas
Mountains
Optical imaging
Optical sensors
Particle size
Reflectance
Regions
Remote sensing
River basins
Rivers
Satellite imagery
Satellites
Size estimation
Snow
Snow accumulation
snow grain size
snow grain-size and pollution (SGSP)
Snowpack
Spaceborne remote sensing
Spectral reflectance
Surface water
Surface-groundwater relations
Water balance
Water pollution
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Summary:Snow in mountainous areas is a major source of surface water and groundwater recharge in the world. The water balance in mountainous regions is controlled by the interactions between the climate, cryospheric, and hydrological systems. Surface snow grain is a sensitive thermodynamic indicator of snowpack and plays an important role in the snow albedo. In mountainous regions, the complicated terrain conditions may introduce errors in the snow grain size estimated from satellite imagery. In this letter, an effective method based on the Snow Grain-Size and Pollution (SGSP) amount algorithm is proposed to estimate the surface snow grain size with careful topographic correction, using spectral reflectance data in Channel 5 (1.24 μm) of the Moderate Resolution Imaging Spectrometer. The SGSP-estimated snow grain size was validated with in situ measurements collected from field campaigns in mountainous areas of Manasi River Basin, China, during the periods of snow accumulation and ablation from 2011 to 2015. The R 2 value of 0.90 and root mean squared error of 80.42 μm were obtained.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2017.2775207