High Mountain Asia Annual 90m Glacier Surface Melt/Freeze Phenology from SAR Imagery, Version 1

This data set contains annual surface melt onset and freeze onset dates across all glaciers in the Hindu Kush Himalayas (HKH) retrieved from time series synthetic aperture radar (SAR) imagery. The data set was based on analysis of C-band Sentinel-1 A/B SAR time series, comprising 32, 741 Sentinel-1 A/B SAR images. The duration of annual glacier surface melt was determined for 105, 432 mapped glaciers (83, 102 km2 glacierized area) during the calendar years 2017-2020.

本数据集涵盖兴都库什-喜马拉雅（Hindu Kush Himalayas，HKH）地区全部冰川的年度表面融冰起始日期与冻结起始日期，数据提取自时序合成孔径雷达（SAR）影像。本数据集基于对C波段哨兵1号A/B（Sentinel-1 A/B）SAR时序影像的分析，共包含32741景哨兵1号A/B SAR影像。本数据集针对2017至2020年日历年期间的105432条已制图冰川（冰川覆盖总面积达83102平方千米），确定了其年度冰川表面融冰的持续时长。