{"id":"9764584a-f2df-455b-96ef-8e8968a230fa","title":"全球长时间序列逐日雪深数据集（1980-2018）","title_en":"Long-term series of daily global snow depth (1979-2017)","serial":"","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。","instructions":"数据据每一天存放一个txt文件，每个文件由文件头（投影方式）和1383*586的雪深矩阵组成，每个雪深代表一个25,067.53m* 25,067.53m的格网。","description":"全球雪深数据集采用被动微波遥感反演方法制作，数据覆盖时间从1980年到2018年，时间分辨率为逐日，覆盖范围为全球，空间分辨率为25,067.53 m。遥感反演方法采用动态亮温梯度算法，算法考虑积雪特性在时空和空间上的变化，建立了不同频率亮度温度差与实测雪深在空间和季节上的动态关系。长时间序列星载被动微波亮度温度数据来自SMMR、SSM/I和SSMI/S三个传感器。为保证不同传感器亮度温度在时间上的一致性，在雪深提取之前对不同传感器亮度温度进行了交叉订正。通过实测站点的验证表明全球雪深数据相对偏差在30%以内。数据据每一天存放一个txt文件，每个文件由文件头（投影方式）和1383*586的雪深矩阵组成，每个雪深代表一个25,067.53m*25,067.53m的格网。该数据的投影方式为EASE-Grid，下面是每个文件的文件头，将其加到每个文件的前面可以将数据在arcgis中显示。\nncols 1383                        // 数据矩阵共1383列\nnrows 586                       // 数据矩阵共586\nxllcorner -17334193.54           //矩阵x方向左下角网格的角落点坐标\nyllcorner -7344787.75           //矩阵y方向轴左下角网格的角落点坐标\ncellsize  25,067.53              //每个网格的大小\nNODATA_value -1             //缺省值","doi":"10.11888/Snow.tpdc.270925","projection":"","language":"zh","share_type":"online","east":180.0,"west":-180.0,"south":-90.0,"north":90.0,"scale":null,"crs":null,"filesize":422000.0,"share_policy":"a","ts_created":"2019-07-05T19:46:05.263432+08:00","doi_type":"拥有自主知识产权","ts_updated":"2021-09-24T15:04:42.546814+08:00","time_description":"1980-2018","datas_group":3,"time_description_en":"","data_format":null,"project":[10,11],"specials":["b4b306da-eab1-47ef-ae5d-be2556298efd","5f218875-5eed-4939-8208-7bf54c573e42","1832ecb3-70d0-4b5e-bdb5-2e9ff4ad1efe"],"cite":null,"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":"Daily","spatial_resolution":"0.1º - 0.25º","license":"Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","fund":[5],"subtopics":{"metadata":"9764584a-f2df-455b-96ef-8e8968a230fa","three_pole":"XDA19070101","third_pole":null},"username":"盖春梅","review_time":"2019-07-07T00:46:13.777631+08:00","protected_duration":null,"protected_describe":null,"is_important":false,"hit_count":7480}