The High Mountain Asia Annual 90m Glacier Surface Melt/Freeze Phenology from SAR Imagery, Version 1 data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). 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. Data are provided for each year individually and each file contains two parameters, Band 1: Melt onset (day-of-year) and Band 2: Freeze onset (day-of-year).
Data set DOI: https://doi.org/10.5067/05I6ZHZWHSVV