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    Google Earth Engine(GEE)——全球距离最近的30米/90米集水区数据集

    最近近排水口以上的高度(HAND)是一个使用最近的排水口进行归一化的数字高程模型,用于水文和更广泛的用途,如灾害测绘、地貌分类和遥感。HAND的基本特征之一是它能够捕捉当地环境中的异质性,否则难以测量或建模。虽然学术文献中发表了许多HAND的应用,但还没有生成和分析全球规模的HAND数据集,特别是使用更高分辨率的DEM,如新的、一角秒(约30米)分辨率的SRTM版本。在这项工作中,我们提出了第一个使用两个DEM的镶嵌计算的全球版本的HAND。SRTM(30米)和Viewfinder Panoramas DEM(90米)。较低分辨率的DEM被用来覆盖北纬60度以上的纬度,在那里SRTM是缺失的。为了并行处理,生成了新的HydroBASINS集水区的同质化、等面积版本。新的集水区边界被用来用D8方法划定DEM。用于计算HAND的方法是用PCRaster软件实现的,在谷歌计算引擎并行平台上运行。

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    Google Earth Engine ——数据全解析专辑(DEM-H: Australian SRTM Hydrologically Enforced Digital)澳大利亚1弧秒 DEM!

    The Hydrologically Enforced Digital Elevation Model (DEM-H) was derived from the SRTM data acquired by NASA in February 2000. The model has been hydrologically conditioned and drainage enforced. The DEM-H captures flow paths based on SRTM elevations and mapped stream lines, and supports delineation of catchments and related hydrological attributes. The dataset was derived from the 1 second smoothed Digital Elevation Model (DEM-S; ANZCW0703014016) by enforcing hydrological connectivity with the ANUDEM software, using selected AusHydro V1.6 (February 2010) 1:250,000 scale watercourse lines (ANZCW0503900101) and lines derived from DEM-S to define the watercourses. The drainage enforcement has produced a consistent representation of hydrological connectivity with some elevation artefacts resulting from the drainage enforcement. A full description of the methods is in preparation (Dowling et al., in prep).

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    图论-网络流-最大流--POJ1273Drainage Ditches(Dinic)

    Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered by water for awhile and takes quite a long time to regrow. Thus, Farmer John has built a set of drainage ditches so that Bessie's clover patch is never covered in water. Instead, the water is drained to a nearby stream. Being an ace engineer, Farmer John has also installed regulators at the beginning of each ditch, so he can control at what rate water flows into that ditch. Farmer John knows not only how many gallons of water each ditch can transport per minute but also the exact layout of the ditches, which feed out of the pond and into each other and stream in a potentially complex network. Given all this information, determine the maximum rate at which water can be transported out of the pond and into the stream. For any given ditch, water flows in only one direction, but there might be a way that water can flow in a circle.

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    Google Earth Engine——流域边界数据集 (WBD) 是水文单位 (HU) 数据的综合汇总集合,与国家划定和分辨率标准一致。它定义了地表水排放到某个点的区域范围

    The Watershed Boundary Dataset (WBD) is a comprehensive aggregated collection of hydrologic unit (HU) data consistent with the national criteria for delineation and resolution. It defines the areal extent of surface water drainage to a point except in coastal or lake front areas where there could be multiple outlets as stated by the Federal Standards and Procedures for the National Watershed Boundary Dataset. Watershed boundaries are determined solely upon science-based hydrologic principles, not favoring any administrative boundaries or special projects, nor particular program or agency. The intent of defining HUs for the WBD is to establish a baseline drainage boundary framework, accounting for all land and surface areas.

    01

    网络流--最大流--POJ 1273 Drainage Ditches

    Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered by water for awhile and takes quite a long time to regrow. Thus, Farmer John has built a set of drainage ditches so that Bessie's clover patch is never covered in water. Instead, the water is drained to a nearby stream. Being an ace engineer, Farmer John has also installed regulators at the beginning of each ditch, so he can control at what rate water flows into that ditch. Farmer John knows not only how many gallons of water each ditch can transport per minute but also the exact layout of the ditches, which feed out of the pond and into each other and stream in a potentially complex network. Given all this information, determine the maximum rate at which water can be transported out of the pond and into the stream. For any given ditch, water flows in only one direction, but there might be a way that water can flow in a circle.

    01

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