青藏高原河湖冰范围/覆盖度数据集V1.0（2002-2018）

青藏高原湖泊众多，该地区湖泊冰期物候和持续时间对区域和全球气候变化非常敏感，因此被用作气候变化研究的关键指标，特别是地球三极环境变化对比研究。但由于其自然环境恶劣，人口稀少，缺乏对湖泊冰物候的常规现场测量。利用中分辨率成像光谱仪(MODIS)归一化差雪指数(NDSI)数据，以500米的分辨率对湖泊冰进行了监测，填补了观测空白。利用传统的雪图算法对晴天条件下的湖泊日冰量和覆盖范围进行检测，利用湖泊表面条件的时空连续性，通过一系列步骤对云层覆盖条件下的湖泊日冰量和覆盖范围进行重新确定。通过时间序列分析308个大于3km2的湖泊确定为湖冰范围和覆盖的有效记录,形成每日湖冰范围和覆盖数据集,包括216个湖泊。

The Qinghai-Tibet Plateau is home to numerous lakes. The ice phenology and duration of lakes in this region are highly sensitive to regional and global climate change, thus serving as key indicators for climate change research, especially comparative studies on environmental changes in the Earth's Three Poles. However, due to the harsh natural environment and sparse human population, routine in-situ measurements of lake ice phenology are lacking. Monitoring of lake ice was carried out using Moderate Resolution Imaging Spectroradiometer (MODIS) Normalized Difference Snow Index (NDSI) data at a 500-meter resolution, filling the observational gap. The daily ice volume and coverage of lakes under cloud-free conditions were detected using traditional snow mapping algorithms. Leveraging the spatiotemporal continuity of lake surface conditions, the daily ice volume and coverage of lakes under cloud-covered conditions were re-determined through a series of procedures. Valid records of lake ice extent and coverage for 308 lakes with an area greater than 3 km² were obtained through time series analysis, and a daily lake ice extent and coverage dataset covering 216 lakes was finally established.