数据质量描述
Accuracy of Data： (1) The percentage difference of the absolute area encircled by the manually delineated lake boundary and that derived by the GPS survey varied from 5.5–25.5 %. (2) The average accuracy of the delineation of glacial lake boundaries was within ±0.5 pixels (±15 m). (3) The resulting calculated error indicated that the total absolute area error of HMA glacial lakes was approximately ±231.44 and ±259.68 km2 and the average relative error was ±13.8 and ±13.3 % in 1990 and 2018, respectively.
数据源描述
- Landsat Images Download from the websites of the United States Geological Survey (https://www.usgs.gov/) and Geospatial Data Cloud (http://www.gscloud.cn/).
- Glacier Inventory Acquired from the Second Chinese Glacier Inventory (http://westdc.westgis.ac.cn) and RGI 5.0 (https://www.glims.org/RGI/rgi50_dl.html).
- SRTM Shuttle Radar Topography Mission digital elevation model with spatial resolution of 1″download from the website http://imagico.de/map/demsearch.php.
数据集摘要
The data set integrated glacier inventory data and 668 Landsat TM/ETM+/OLI images, and adopted manual visual interpretation to extract glacial lake boundaries within a 10-km buffer from glacier terminals using ArcGIS and ENVI software, normalized difference water index maps, and Google Earth images. It was established that 27,205 and 30,121 glacial lakes in HMA, with sizes of 0.0054–6.46 km2, covered a combined area of 1806.47 ± 2.11and 2080.12 ± 2.28 km2 in 1990 and 2018, respectively.The current glacial lake inventory provided fundamental data for water resource evaluation, assessment of glacial lake outburst floods and gacier hydrology research in the mountain cryosphere region.
- Name of Data High_Asia_glacial_lake_1990.Shp High_Asia_glacial_lake_2018.shp
- Data description of attribute items GLAKE_ID: The coding of glacial Lake GL_Image: Information of source image GL_Type: The type of glacial Lake GL_SubR: The Sbu-region of glacial Lake in the HMA GL_Time: The acquisition date of the original Landsat image GL_Elev: The average elevation of glacial lake (m) GL_Area: The area of glacial lake (m2) GL_Peri: The Perimeter of glacial lake (m) GL_A_Error: The error of glacial lake area (m2) GL_Long: The longitude of center point of the glacial lakes (°) GL_Lati: The latitude of center point of the glacial lakes (°)
项目支持信息
| # | 编号 | 名称 | 类型 |
| 1 | 41771075 | Effects of meltwater withheld by glacial lake expansion and its implications for GLOF hazards | 国家自然科学基金项目 |
| 2 | 41571061 | Estimation of the mass balance of lake-contacted glaciers | 国家自然科学基金项目 |
| 3 | 41271091 | Coupling mechanism of temperature field and structure change in moraine dam and its impacts on the stability of dam | 国家自然科学基金项目 |
Wang Xin, Guo Xiaoyu, Yang Chengde, Liu Qionghuan, Wei Junfeng, Zhang Yong, Liu Shiyin, Zhang Yanlin, Jiang Zongli, Tang Zhiguang，Glacial lake inventory of High Mountain Asia，National Cryosphere and Desert Scientific Data Center，2019，doi：10.12072/casnw.064.2019.db
| # | 标题 | 格式 | 文件大小 |
| 1 | High_Asia_glacial_lake_1990.cpg | cpg | 5 Bytes |
| 2 | High_Asia_glacial_lake_1990.dbf | dbf | 10.1 MB |
| 3 | High_Asia_glacial_lake_1990.prj | prj | 440 Bytes |
| 4 | High_Asia_glacial_lake_1990.sbn | sbn | 248.2 kB |
| 5 | High_Asia_glacial_lake_1990.sbx | sbx | 7.8 kB |
| 6 | High_Asia_glacial_lake_1990.shp | shp | 21.8 MB |
| 7 | High_Asia_glacial_lake_1990.shp.xml | xml | 164.6 kB |
| 8 | High_Asia_glacial_lake_1990.shx | shx | 208.8 kB |
| 9 | High_Asia_glacial_lake_2018.cpg | cpg | 5 Bytes |
| 10 | High_Asia_glacial_lake_2018.dbf | dbf | 11.2 MB |
| 11 | High_Asia_glacial_lake_2018.prj | prj | 440 Bytes |
| 12 | High_Asia_glacial_lake_2018.sbn | sbn | 271.4 kB |
| 13 | High_Asia_glacial_lake_2018.sbx | sbx | 8.0 kB |
| 14 | High_Asia_glacial_lake_2018.shp | shp | 21.9 MB |
| 15 | High_Asia_glacial_lake_2018.shp.xml | xml | 151.2 kB |
| 16 | High_Asia_glacial_lake_2018.shx | shx | 231.7 kB |
| 17 | High_Asia_glacial_lake.rar | None | 32.4 MB |