GLC_FCS30D: the first global 30-m land-cover dynamic monitoring product with fine classification system from 1985 to 2022

GLC_FCS30D is the first global fine land cover dynamic product at a 30-meter resolution that adopts continuous change detection. It utilizes a refined classification system containing 35 land-cover categories and covers the time span from 1985 to 2022. Before the year 2000, the update cycle was every 5 years, while after 2000, it is updated annually. In specific, it developed by combining the continuous change detection method, local adaptive updating models and the spatiotemporal optimization algorithm from dense time-series Landsat imagery, and was validated to achieve an overall accuracy of 80.88% (±0.27%) for the basic classification system 10 major land-cover types) and 73.24% (±0.30%) for the LCCS level-1 validation system (17 LCCS land-cover types). The GLC_FCS30D has been compressed into 36 zip files, and the details about the GLC_FCS30D can be found in the User's guides.GLC_FCS30D是首款采用连续变化检测技术的30米分辨率全球精细化土地覆盖动态产品。该产品采用包含35个土地覆盖类别的精细化分类体系，时间跨度覆盖1985年至2022年。其更新周期在2000年以前为每5年一次，2000年之后则实现年度更新。具体而言，本数据集依托密集时间序列Landsat（陆地卫星）影像，结合连续变化检测方法、局部自适应更新模型与时空优化算法开发而成。经验证，其针对基础分类体系下10种核心土地覆盖类型的总体精度达80.88%（±0.27%），针对土地覆盖分类系统（Land Cover Classification System，LCCS）一级验证体系（包含17种LCCS土地覆盖类型）的总体精度为73.24%（±0.30%）。 GLC_FCS30D已被压缩为36个ZIP压缩包，该数据集的详细信息可参阅《用户指南》。