{"id":"52c1ea76-e10e-48de-93d4-468ce15db8fc","title":"青藏高原逐日无云积雪数据集（2002-2021）","title_en":"Daily cloud-free snow cover products for Tibetan Plateau from 2002 to 2021","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":"文件命名：积雪数据集以GeoTIFF格式存储，文件的名称为“HMRFSTP_yyyyddd. tif”，其中HMRFSTP为“A Hidden Markov Radom Field-based snow cover product for Tibetan Plateau”缩写，yyyy代表年，ddd代表儒略日，比如HMRFSTP_2002135.tif就代表该文件描述2002年第135天青藏高原积雪覆盖状况。\n数据使用方式：该数据集中所有GeoTIFF文件均可直接用ArcGIS、QGIS、ENVI、MATLAB等软件查看并处理。","description":"基于长时间序列MODIS积雪产品，采用隐马尔可夫随机场（Hidden Markov Random Field, HMRF）建模框架，制备了青藏高原2002-2021年空间分辨率为500 m的逐日无云积雪数据集。该建模框架将MODIS积雪产品的光谱信息、时空背景信息，以及环境相关信息以最优形式进行整合，不仅填补了云层遮挡引起的数据空缺，而且提高了原始MODIS积雪产品的精度。特别地，本数据集在环境背景信息中引入了太阳辐射能量对积雪分布的影响，有效改进了地形复杂山区的积雪识别精度。通过与实测雪深、Landsat-8 OLI识别的积雪分布对比分析，本数据集精度依次为98.31%和92.44%，并且在积雪转化期、海拔较高、太阳辐射较多的阳坡提升效果显著。本数据集改善了原始MODIS积雪产品时空不连续和在地形复杂山区精度较低的问题，能为青藏高原气候变化研究和水资源管理提供重要的数据基础。","doi":"10.11888/Cryos.tpdc.272204","projection":"UTM","language":"zh","share_type":"online","east":104.78,"west":73.31,"south":26.0,"north":39.78,"scale":null,"crs":null,"filesize":1597.44,"share_policy":"a","ts_created":"2022-02-25T09:47:06.031911+08:00","doi_type":"拥有自主知识产权","ts_updated":"2022-03-25T10:30:22.988403+08:00","time_description":"","datas_group":2,"time_description_en":"","data_format":null,"project":[11],"specials":[],"cite":null,"review_status":5,"review_invite":[],"review_editor":{"id":42421,"last_login":"2022-04-08T15:16:51.670544+08:00","username":"任慧霞","email":"510727846@qq.com","is_active":true,"is_staff":true,"user_name":"任慧霞"},"data_sources":null,"temporal_resolution":"Daily","spatial_resolution":"100m - 1km","license":"Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","fund":[833],"subtopics":{"metadata":"52c1ea76-e10e-48de-93d4-468ce15db8fc","three_pole":null,"third_pole":null},"username":"黄艳","review_time":null,"protected_duration":0,"protected_describe":"保护期1年","is_important":false,"hit_count":43}