"一带一路"亚洲关键区域流域边界图的划定主要依据以下原则: 原则1:在丝绸之路沿线 原则2:位于干旱半干旱区 原则3:具有较高的水资源风险 原则4:流域完整性 1. 干旱区划分依据 Food and Agriculture Organization of the United Nations. FAO GEONETWORK. Global map of aridity - 10 arc minutes (GeoLayer). (Latest update: 04 Jun 2015) Accessed (6 Mar 2018). URI: http://data.fao.org/ref/221072ae-2090-48a1-be6f-5a88f061431a.html?version=1.0 2. 水资源风险数据: Gassert, F., M. Landis, M. Luck, P. Reig, and T. Shiao. 2014. Aqueduct Global Maps 2.1. Working Paper. Washington, DC: World Resources Institute. 3. 贫困指数数据: Elvidge C D, Sutton P C, Ghosh T, et al. A global poverty map derived from satellite data. Computers & Geosciences, 2009, 35(8): 1652-1660. https://www.ngdc.noaa.gov/eog/dmsp/download_poverty.html 4. 基础流域边界数据: (1) Watershed boundaries were derived from HydroSHEDS drainage basins data (Lehner and Grill 2013) based on a grid resolution of 15 arc-seconds (approximately 500 m at the equator), which can be free download via https://hydrosheds.cr.usgs.gov/hydro.php (2) AQUASTAT Hydrological basins: This dataset is developed as part of a GIS-based information system on water resources. It has been published in the framework of the AQUASTAT - programme of the Land and Water Division of the Food and Agriculture Organization of the United Nations. The map is also available in the SOLAW Report 15: “Sustainable options for addressing land and water problems – A problem tree and case studies”. Data can be free download via http://www.fao.org/nr/water/aquamaps/ (3) HydroBASINS: https://www.hydrosheds.org/downloads 5. The GloRiC provides a database of river types and sub-classifications for all river reaches globally. https://www.hydrosheds.org/page/gloric 6. HydroATLAS offers a global compendium of hydro-environmental sub-basin and river reach characteristics at 15 arc-second resolution. https://www.hydrosheds.org/page/hydroatlas 覆盖面积146.94万平方公里,具体包含如下区域:怒江流域,死海流域,锡斯坦河流域,黄河流域,约旦-叙利亚东部流域,印度河流域,伊朗内流区,乌尔米耶湖流域,石羊河流域,哈里卢德-穆尔加布河流域,两河流域,疏勒河流域,黑河流域,伊塞克库尔湖,塔里木河流域,吐鲁番-哈密盆地,艾比湖流域,准噶尔盆地,阿姆河流域,玛纳斯河流域,乌伦古河流域,额敏河流域,楚河-塔拉斯河流域,锡尔河流域,伊犁河流域,里海流域,澜沧江流域,长江流域,青海湖水系,柴达木盆地东部,柴达木盆地西部,羌塘高原区,雅鲁藏布江流域.
冉有华, 王磊, 曾甜, 盖春梅, 李虎
青藏高原光学仪器遥感1km积雪覆盖数据集(1989-2018)基于星载光学仪器观测数据云雪判识方法制作,覆盖时间从1989年到2018年(每年1-4月和10-12月两个时段),时间分辨率为逐日,覆盖范围为青藏高原(17°N -41°N,65°E -106°E),采用等经纬度投影,空间分辨率为0.01°×0.01°。数据集以日产品表征了卫星观测时刻晴空无云或透明薄云下的地面是否为积雪所覆盖。输入数据源为NOAA与MetOp卫星的AVHRR L1数据,以及从TERRA/MODIS对应于AVHRR通道的L1数据。产品处理方法为独立于云掩模产品的动态阈值决策树算法(DT),即算法同时判别云雪,且其云检测强调保留雪信息,特别是透明卷云下的雪。DT算法针对不同情况,考虑了多种判识手段,如水云上的冰云,森林和沙地的积雪,薄雪或融雪等;根据地表类型、DEM和季节设定动态阈值;采用多种质量控制手段,如在重度气溶胶或烟尘覆盖的低纬度森林中剔除伪雪,参考最大月雪线和最小雪面亮度温度剔除伪雪;优化不同种类型云雪和晴空无雪陆地的判识流程。DT算法在正常情况下能区分大部分云雪,但会低估10月份青藏高原的积雪。基于多年地面气象台站雪深观测资料验证表明,本数据集对晴空条件下地面有无积雪的总体判识准确率在95%以上。数据采用标准的HDF4格式存储,内部有积雪覆盖和质量码两个SDS,维度均为4100列×2400行,且文件内部有完备的属性描述。
郑照军, 除多
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