The dataset integrated glacier inventory data and 426 Landsat TM/ETM+/OLI images, and adopted manual visual interpretation to extract glacial lake boundaries within a 10-km buffer from glacier terminals using ArcGIS and ENVI software, normalized difference water index maps, and Google Earth images. It was established that 26,089 and 28,953 glacial lakes in HMA, with sizes of 0.0054–5.83 km2, covered a combined area of 1692.74 ± 231.44 and 1955.94 ± 259.68 km2 in 1990 and 2018, respectively. The current glacial lake inventory provided fundamental data for water resource evaluation, assessment of glacial lake outburst floods, and glacier hydrology studies in the mountain cryosphere region.
WANG Xin, GUO Xiaoyu, YANG Chengde, LIU Qionghuan, WEI Junfeng, ZHANG Yong, LIU Shiyin, ZHANG Yanlin, JIANG Zongli, TANG Zhiguang
积雪面积比例(fractional snow cover, FSC)是定量描述单位像元内积雪覆盖面积(Snow Cover Area SCA)与像元空间范围的比值。本数据集涵盖区域为北极地区(北纬35°至北纬90°),使用Google Earth Engine平台,采用的初始数据为MOD09GA 分辨率为1000m的全球地表反射率产品,数据制备时间为2000年2月24日至2019年11月18日。方法为:在训练样本区域,使用Landsat 8地表反射率的数据和SNOMAP算法制备FSC的参考数据集,将该数据集作为训练样本区域FSC真值,从而建立训练样本区域FSC与基于MODIS地表反射率产品的雪被指数NDSI之间的线性回归模型。使用该模型,将MODIS全球地表反射率产品作为输入,制备北极地区积雪面积比例时序数据。该数据集可为区域气候模拟、水文模型等提供积雪分布的定量信息。
马媛, 李弘毅
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