地表覆盖数据描绘了陆地表面生态状况和生物物理属性。它是生态环境评估、陆表模型构建、资源规划管理等科学研究的基础支撑数据。为满足气候变化下冰冻圈领域对地表覆盖时空数据的共性需求，基于MODIS C61 MCD12Q1数据产品，通过格式转换、重投影、提取、质控、融合等处理流程，生成了IGBP、UMD、LAI、BGC、PFT等 5种地表覆盖分类方案的全球数据集。本数据集提供了全球视角下地表覆盖的时空变化信息，不仅可直接用于分析中国及周边地区地表覆盖的时空变化和趋势，也可为气候变化背景下区域生态系统演变、土地利用变化等研究提供基础资料。
", "ds_source": "以MODIS MCD12Q1作为基础数据，Landsat-5、7、8与9的彩色合成影像作为辅助数据。这些数据来源于美国国家航空航天局(/www.earthdata.nasa.gov)和美国地质调查局(earthexplorer.usgs.gov)。
", "ds_process_way": "数据集的生成主要包括3个步骤：(1) 对数据文件格式、坐标系统、分辨率等进行转换处理，依据每个条带号，生成逐年、空间分辨率为500m的GeoTIFF文件；(2) 按照QC层，提取每种地表覆盖分类方案所对应的数据，并对同一个像元所对应的8种类别进行一致性检查，若存在冲突则将其与Landsat彩色合成影像进行叠加校验，采用众数作为判别规则；(3) 将通过检验的每个数据文件，依据地表覆盖分类方案和年份进行空间融合计算，生成全球逐年地表覆盖空间格局数据集。
", "ds_quality": "数据集按照年份和分类方案进行组织，命名规则为GIobalLandCover[分类方案]500m[年份].tif。数据质量整体与MODIS MCD12Q1产品一致，总体精度在70%-80%之间。
", "ds_acq_start_time": "2001-01-01 00:00:00", "ds_acq_end_time": "2024-12-31 00:00:00", "ds_acq_place": "全球", "ds_acq_lon_east": 180.0, "ds_acq_lat_south": 90.0, "ds_acq_lon_west": 180.0, "ds_acq_lat_north": 90.0, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "login-access", "ds_total_size": 9000336288, "ds_files_count": 121, "ds_format": "GeoTIFF", "ds_space_res": "500米", "ds_time_res": "年", "ds_coordinate": "WGS84", "ds_projection": "GCS_WGS_1984", "ds_thumbnail": "234a86fb-0f1b-4fcc-a986-12961b8d1ef4.jpg", "ds_thumb_from": 0, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": null, "organization_id": "9de89acc-5714-4927-aba3-ac88067dff8a", "ds_serv_man": "李红星", "ds_serv_phone": "0931-4967592", "ds_serv_mail": "lihongxing@lzb.ac.cn", "doi_value": "", "subject_codes": [ "170" ], "quality_level": 3, "publish_time": "2025-11-19 08:49:37", "last_updated": "2025-11-21 08:56:03", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.NCDC.NIEER.DB7005.2025", "license": null, "i18n": { "en": { "title": "Global annual 500 meter land cover dataset (2001-2024)", "ds_format": "", "ds_source": "", "ds_quality": "", "ds_ref_way": "", "ds_abstract": "", "ds_time_res": "年", "ds_acq_place": "worldwide", "ds_space_res": "500米", "ds_projection": "", "ds_process_way": "", "ds_ref_instruction": "" } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "CC BY 4.0", "ds_topic_tags": [ "地表覆盖", "土地利用", "全球", "2001-2024", "500m", "IGBP", "UMD", "LAI", "BGC" ], "ds_subject_tags": [ "地球科学" ], "ds_class_tags": [], "ds_locus_tags": [ "全球" ], "ds_time_tags": [ 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024 ], "ds_contributors": [ { "true_name": "赵国辉", "email": "zhgh@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "赵国辉", "email": "zhgh@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "ds_managers": [ { "true_name": "赵国辉", "email": "zhgh@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "category": "遥感及产品" }