{"id":"3d6bd3b1-91aa-4282-bd10-4de70f4090c6","title":"喀喇昆仑中部区域冰流场数据集（V1.0）（1999-2003）","title_en":"Glacier velocity of the Central Karakoram (Version 1.0) (1999-2003)","serial":"地球大数据科学工程专项时空三极环境项目","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":"","description":"在全球气候变暖背景下，世界范围内山地冰川消融强烈，以退缩为主，但现有野外观测发现，喀喇昆仑地区大部分冰川保持稳定或前进状态，为“喀喇昆仑异常”。冰川表面流速是研究冰川动力学和物质平衡的重要参数，研究喀喇昆仑中部区域冰川流速时空变化特征对于认识该区域冰川动力学特征及其对气候变化的响应具有重要的意义。\n选取1999-2003年获取的四对Landsat 7 ETM+影像（影像获取时间分别为：1999.7.16, 2000.6.16, 2001.7.21, 2002.8.9, 2002.4.19, 2003.3.21），采用全色波段，分辨率为15 m，对每对影像进行精确配准，然后对配准后的两景影像进行互相关计算，获取1999-2003年喀喇昆仑中部区域冰川表面流速。由于研究区域内缺乏流速实地观测数据，因此利用稳定区域的偏移量值评估冰流结果的精度，冰川表面流速误差约为±7 m/year。\n冰流场数据覆盖时间从1999年到2003年，时间分辨率为逐年，覆盖范围为喀喇昆仑中部区域，空间分辨率为30 m，每年的冰流场数据存放一个Geotiff文件。\n数据的详细情况见喀喇昆仑中部区域冰流场-数据说明。","doi":"10.11888/Glacio.tpdc.270059","projection":"","language":"zh","share_type":"offline","east":77.5,"west":75.5,"south":35.0,"north":36.5,"scale":250000,"crs":"","filesize":420.0,"share_policy":"b","ts_created":"2018-02-15T06:56:18+08:00","doi_type":"沿用数据已有DOI","ts_updated":"2021-04-19T10:12:40.736608+08:00","time_description":"","datas_group":0,"time_description_en":"","data_format":"Geotiff","project":[10,11],"specials":["1832ecb3-70d0-4b5e-bdb5-2e9ff4ad1efe","f2a78cde-1c98-4241-94dc-7532eba32b80"],"cite":"","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":[1,5],"subtopics":{"metadata":"3d6bd3b1-91aa-4282-bd10-4de70f4090c6","three_pole":"XDA19070104","third_pole":null},"username":"潘小多","review_time":null,"protected_duration":6,"protected_describe":null,"is_important":false,"hit_count":2797}