中国AVHRR逐日无云5km积雪面积产品数据集（1980-2020年）

积雪是冰冻圈重要的组成部分，积雪覆盖范围影响地气能量平衡，进而影响气候和环境变化。积雪面积是重要的积雪参数之一，是水文和气候模型的重要输入。本数据集针对中国积雪特性，基于AVHRR-CDR反射率产品，发展了多级决策树积雪判别算法，同时利用隐马尔科夫算法、多源数据融合方法实现了产品的完全去云，制备了1980-2020年空间分辨率为5 km的逐日无云积雪面积数据集。该数据集以HDF5文件格式存储，每个HDF5文件包含18个数据要素，其中包括数据值、数据起始日期、经纬度等。同时为了快速预览积雪分布情况，逐日文件包含积雪面积缩略图，以jpg格式存储。数据集同时包含用户使用手册，方便用户使用。本数据集采用完全开放共享形式。

Snow cover is a critical component of the cryosphere. The extent of snow cover affects the energy balance between the atmosphere and land, thereby influencing climate and environmental changes. Snow cover area is one of the key snow parameters and serves as an important input for hydrological and climate models. Targeting the characteristics of snow cover over China, this dataset developed a multi-level decision tree-based snow discrimination algorithm based on the AVHRR-CDR reflectance product. Meanwhile, it adopted the Hidden Markov Model (HMM) and multi-source data fusion methods to completely remove clouds from the products, and generated a daily cloud-free snow cover area dataset spanning 1980–2020 with a spatial resolution of 5 km. This dataset is stored in HDF5 file format, with each HDF5 file containing 18 data fields including data values, data start date, latitude and longitude, and so on. Additionally, to enable quick preview of snow cover distribution, each daily file includes a snow cover area thumbnail stored in JPG format. The dataset also provides a user manual to facilitate user utilization. This dataset is fully open and freely shared.

搜集汇总

背景与挑战

背景概述

该数据集提供了1980-2020年中国陆域逐日无云5km积雪面积产品，基于AVHRR-CDR反射率数据并通过先进算法去云处理，以HDF5格式存储，包含18个数据要素和积雪分布缩略图，适用于水文和气候模型研究。