%0 Dataset
%T Arctic snow cover daily dataset from 1980 to 2024
%J National Cryosphere Desert Data Center
%I National Cryosphere Desert Data Center(www.ncdc.ac.cn)
%U http://www.ncdc.ac.cn/portal/metadata/321846a0-24dc-4b80-9591-9aceb689c39a
%W NCDC
%R 10.12072/ncdc.arctic-change.db7143.2026
%A WU Tonghua
%K Arctic;Cryosphere;Snow Cover;500m
%X The snow cover dataset aims to provide a long-term (1980–2024), continuous (daily) record of snow cover in the Arctic (north of 66°34′N) for climate and environmental research, integrating two authoritative data sources (AVHRR and MODIS) to meet the demand for high-resolution binary snow cover data in climate monitoring, hydrological modeling, and ecological studies. Before February 24, 2000, Advanced Very High Resolution Radiometer (AVHRR) imagery is used, generating snow cover fraction (SCFG) through radiometric calibration, cloud detection, and snow identification algorithms. From February 24, 2000, onward, Moderate Resolution Imaging Spectroradiometer (MODIS) imagery is used, producing 500m-resolution snow cover fraction based on the Normalized Difference Snow Index (NDSI) and quality control measures. All data are resampled to a uniform 500m spatial resolution using nearest-neighbor interpolation to align AVHRR (coarser resolution) and MODIS data. Snow cover fraction (SCF) ≥40% is classified as snow-covered (value = 1); SCF <40% as no snow cover (value = 0); and areas affected by rain, snow, or clouds are marked as NoData. Advantages: Integrates AVHRR and MODIS data for a continuous 1980–2024 record, offers uniform 500m resolution for modern geospatial analysis, and provides binary classification suitable for applications requiring clear snow boundaries.