{"id":"8d2a4a4d-1475-40eb-a553-4f489b2b75ad","title":"青藏高原积雪覆盖数据集——多源融合算法（2008-2010）","title_en":"Snow cover dataset of the Tibetan Plateau - multisource fusion algorithm (2008-2010)","serial":"三极监测与大数据中心","user_limit":"为尊重知识产权、保障数据作者的权益、扩展数据中心的服务、评估数据的应用潜力，请数据使用者在使用数据所产生的研究成果中（包括公开发表的论文、论著、数据产品和未公开发表的研究报告、数据产品等成果），明确注明数据来源和数据作者。对于转载（二次或多次发布）的数据，作者还须注明原始数据来源。  中文发表的成果参考以下规范注明： 数据来源于“黑河计划数据管理中心”(http://westdc.westgis.ac.cn)  英文发表的成果依据以下规范注明： The data set is provided by Cold and Arid Regions Sciences Data Center at Lanzhou (http://westdc.westgis.ac.cn)","instructions":"","description":"本数据集是基于MODIS的积雪面积比例制图集成算法Coupled Regional Approach (CRA)而获得的积雪覆盖数据集。CRA算法主要包括三部分，首先利用N-FINDR（体积迭代方法）和OSP（Orthogonal Subspace Projection）在图像上根据设定自动提取端元（提取了30个端元）；在自动提取的基础上，结合IGBG土地覆盖类型图，通过人工筛选方法选择了积雪、植被、云、土壤、岩石和水6种类型端元，并根据2009年影像建立了年度光谱数据库，每个月上中下旬共3个光谱，一年共36个光谱；利用建立的光谱数据库作为先验知识，在先验知识的基础上利用全约束线性解混方法（FCLS）进行亚像元分解获取初级积雪面积比例产品。并采用改进地形影响的NDSI比值算法获取积雪面积，然后进行时空数据插值，最后与AMSR-E微波雪深产品进行多源数据融合而得到。\n该数据集采用经纬度（Geographic）投影方式，大地基准面为WGS84，空间分辨率0.005°，提供2008-2010年逐日的青藏高原无云覆盖积雪面积图。数据集按年份存放，共由3个文件夹组成，从2008到2010。每个文件夹里包含当年的逐日积雪覆盖分类结果，为tif文件，命名规则为：YYYY***.tif，其中YYYY代表年（2008-2010），***代表日（001~365/366）。可直接用ARCGIS或者ENVI打开。","doi":"10.11888/Snow.tpdc.270013","projection":"","language":"zh","share_type":"online","east":103.0,"west":75.0,"south":28.0,"north":37.0,"scale":3000000,"crs":null,"filesize":23961.6,"share_policy":"a","ts_created":"2012-07-23T19:44:52+08:00","doi_type":null,"ts_updated":"2021-04-19T09:07:52.039793+08:00","time_description":"","datas_group":3,"time_description_en":null,"data_format":"img","project":[10,11],"specials":["1832ecb3-70d0-4b5e-bdb5-2e9ff4ad1efe","f2a78cde-1c98-4241-94dc-7532eba32b80"],"cite":"Hao Xiaohua, Wang Jian, Li Hongyi. Evaluation of the NDSI threshold value in mapping snow cover of MODIS—A case study of snow in the middle Qilian Mountains. Journal of Glaciology and Geogryology. 2008,30 (1): 132-138.","review_status":5,"review_invite":[],"review_editor":{"id":21057,"last_login":"2022-04-02T11:43:37.753860+08:00","username":"gecm","email":"gechm@lzb.ac.cn","is_active":true,"is_staff":true,"user_name":"盖春梅"},"data_sources":"","temporal_resolution":"","spatial_resolution":"","license":"Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","fund":[],"subtopics":{"metadata":"8d2a4a4d-1475-40eb-a553-4f489b2b75ad","three_pole":null,"third_pole":null},"username":"盖春梅","review_time":null,"protected_duration":6,"protected_describe":null,"is_important":false,"hit_count":6323}