TY - JOUR
T1 - Snow grain-size estimation over mountainous areas from MODIS imagery
AU - Wang, Jiangeng
AU - Feng, Xuezhi
AU - Xiao, Pengfeng
AU - Ye, Nan
AU - Zhang, Xueliang
AU - Cheng, Yinyi
PY - 2018/1/1
Y1 - 2018/1/1
N2 - 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 R2 value of 0.90 and root mean squared error of 80.42 μm were obtained.
AB - 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 R2 value of 0.90 and root mean squared error of 80.42 μm were obtained.
KW - Moderate resolution imaging spectrometer (MODIS)
KW - Mountainous areas
KW - Snow grain size
KW - Snow grain-size and pollution (SGSP)
UR - http://www.scopus.com/inward/record.url?scp=85038353611&partnerID=8YFLogxK
U2 - 10.1109/LGRS.2017.2775207
DO - 10.1109/LGRS.2017.2775207
M3 - Article
AN - SCOPUS:85038353611
SN - 1545-598X
VL - 15
SP - 97
EP - 101
JO - IEEE Geoscience and Remote Sensing Letters
JF - IEEE Geoscience and Remote Sensing Letters
IS - 1
ER -