HydroSHEDS, bölgesel ve küresel ölçekli uygulamalar için tutarlı bir biçimde hidrografik bilgiler sağlayan bir harita çıkarma ürünüdür. Nehir ağları, su havzası sınırları, drenaj yönleri ve akış birikimleri dahil olmak üzere çeşitli ölçeklerde coğrafi referanslı veri kümeleri (vektör ve raster) sunar. HydroSHEDS, NASA'nın 2000 yılında Shuttle Radar Topography Mission (SRTM) tarafından elde edilen yükseklik verilerine dayanmaktadır.
Bu akış birikimi veri kümesi, her hücreye akan yukarı akış alanının miktarını (hücre sayısı olarak) tanımlar. Drenaj yönü katmanı, hangi hücrelerin hedef hücreye aktığını tanımlamak için kullanılır. Biriken hücrelerin sayısı esasen yukarı akış havzasının bir ölçüsüdür. Ancak HydroSHEDS veri kümesinin hücre boyutu enleme bağlı olduğundan hücre birikimi değeri doğrudan kilometrekare cinsinden drenaj alanlarına çevrilemez. Değerler, topografik yüksek noktalarda (nehir kaynakları) 1'den büyük nehirlerin ağızlarında çok büyük sayılara (milyonlarca hücre mertebesinde) kadar değişir.
Bu veri kümesi 30 yay saniyesi çözünürlüğe sahiptir. 30 yay saniyesi çözünürlükte kullanılabilen veri kümeleri; Hidrolojik Koşullandırılmış DEM, Drenaj (Akış) Yönü ve Akış Birikimi'dir.
HydroSHEDS verilerinin kalitesinin, 60 derece kuzey enleminin üzerindeki bölgelerde önemli ölçüde daha düşük olduğunu unutmayın. Bunun nedeni, temel SRTM yükseklik verilerinin olmaması ve bu nedenle daha kaba çözünürlüklü bir DEM'in (USGS tarafından sağlanan HYDRO1k) kullanılmasıdır.
HydroSHEDS, Dünya Doğayı Koruma Vakfı (WWF) Koruma Bilimi Programı tarafından ABD Jeoloji Araştırmaları Kurumu, Uluslararası Tropikal Tarım Merkezi, The Nature Conservancy ve Almanya'daki Kassel Üniversitesi Çevre Sistemleri Araştırma Merkezi iş ortaklığıyla geliştirilmiştir.
Bantlar
Piksel Boyutu 927,67 metre
Bantlar
Ad
Min.
Maks.
Piksel Boyutu
Açıklama
b1
1*
6.96575e+06*
metre
Akış birikimi
* tahmini minimum veya maksimum değer
Kullanım Şartları
Kullanım Şartları
HydroSHEDS verileri, ticari olmayan ve ticari kullanım için ücretsizdir. Daha fazla bilgi için lütfen Lisans Sözleşmesi'ni inceleyin.
Alıntılar
Alıntılar:
Lehner, B., Verdin, K., Jarvis, A. (2008): New global hydrography
derived from spaceborne elevation data. Eos, Transactions, AGU,
89(10): 93-94.
HydroSHEDS, bölgesel ve küresel ölçekli uygulamalar için tutarlı bir biçimde hidrografik bilgiler sağlayan bir harita çıkarma ürünüdür. Nehir ağları, su havzası sınırları, drenaj yönleri ve akış birikimleri dahil olmak üzere çeşitli ölçeklerde coğrafi referanslı veri kümeleri (vektör ve raster) sunar. HydroSHEDS, 2000 yılında elde edilen yükseklik verilerine dayanmaktadır.
[null,null,[],[[["\u003cp\u003eHydroSHEDS is a mapping product providing hydrographic information (river networks, watershed boundaries, etc.) at various scales for regional and global applications.\u003c/p\u003e\n"],["\u003cp\u003eIt uses flow accumulation to define the amount of upstream area draining into each cell, essentially measuring the upstream catchment area.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset is based on elevation data from NASA's Shuttle Radar Topography Mission (SRTM) collected in 2000 and is available at 30 arc-second resolution.\u003c/p\u003e\n"],["\u003cp\u003eData quality is lower above 60 degrees northern latitude due to reliance on a coarser-resolution DEM.\u003c/p\u003e\n"],["\u003cp\u003eHydroSHEDS data are free for both non-commercial and commercial use under the specified license agreement.\u003c/p\u003e\n"]]],["The HydroSHEDS dataset, provided by WWF, offers hydrographic data, including river networks, watershed boundaries, drainage directions, and flow accumulations, based on 2000 SRTM elevation data. The flow accumulation dataset, at 30 arc-second resolution, quantifies the upstream area draining into each cell, with values ranging from topographic highs to river mouths. Data quality diminishes above 60 degrees north latitude. The dataset is freely available for commercial and non-commercial usage.\n"],null,["# WWF HydroSHEDS Flow Accumulation, 30 Arc-Seconds\n\nDataset Availability\n: 2000-02-11T00:00:00Z--2000-02-22T00:00:00Z\n\nDataset Provider\n:\n\n\n [WWF](https://www.hydrosheds.org/)\n\nTags\n:\n[accumulation](/earth-engine/datasets/tags/accumulation) [drainage](/earth-engine/datasets/tags/drainage) [flow](/earth-engine/datasets/tags/flow) [geophysical](/earth-engine/datasets/tags/geophysical) [hydrography](/earth-engine/datasets/tags/hydrography) [hydrology](/earth-engine/datasets/tags/hydrology) [hydrosheds](/earth-engine/datasets/tags/hydrosheds) [srtm](/earth-engine/datasets/tags/srtm) [surface-ground-water](/earth-engine/datasets/tags/surface-ground-water) [water](/earth-engine/datasets/tags/water) [wwf](/earth-engine/datasets/tags/wwf) \n\n#### Description\n\nHydroSHEDS is a mapping product that provides hydrographic\ninformation for regional and global-scale applications in a consistent\nformat. It offers a suite of geo-referenced datasets (vector and\nraster) at various scales, including river networks, watershed\nboundaries, drainage directions, and flow accumulations. HydroSHEDS\nis based on elevation data obtained in 2000 by NASA's Shuttle Radar\nTopography Mission (SRTM).\n\nThis flow accumulation dataset defines the amount of\nupstream area (in number of cells) draining into each cell. The\ndrainage direction layer is used to define which cells flow into\nthe target cell. The number of accumulated cells is essentially\na measure of the upstream catchment area. However, since the\ncell size of the HydroSHEDS data set depends on latitude, the\ncell accumulation value cannot directly be translated into drainage\nareas in square kilometers. Values range from 1 at topographic\nhighs (river sources) to very large numbers (on the order of\nmillions of cells) at the mouths of large rivers.\n\nThis dataset\nis at 30 arc-second resolution. The datasets available at 30\narc-seconds are the Hydrologically Conditioned DEM, Drainage\n(Flow) Direction, and Flow Accumulation.\n\nNote that the quality of the HydroSHEDS data is significantly lower for regions above\n60 degrees northern latitude as there is no underlying SRTM elevation data available\nand thus a coarser-resolution DEM was (HYDRO1k provided by USGS).\n\nHydroSHEDS was developed by the World Wildlife Fund (WWF)\nConservation Science Program in partnership with the U.S. Geological\nSurvey, the International Centre for Tropical Agriculture, The\nNature Conservancy, and the Center for Environmental Systems Research\nof the University of Kassel, Germany.\n\n### Bands\n\n\n**Pixel Size**\n\n927.67 meters\n\n**Bands**\n\n| Name | Min | Max | Pixel Size | Description |\n|------|-----|---------------|------------|-------------------|\n| `b1` | 1\\* | 6.96575e+06\\* | meters | Flow accumulation |\n\n\\* estimated min or max value\n\n### Terms of Use\n\n**Terms of Use**\n\nHydroSHEDS data are free for non-commercial and commercial\nuse. For more information, please refer to the [License Agreement](https://www.hydrosheds.org/page/license).\n\n### Citations\n\nCitations:\n\n- Lehner, B., Verdin, K., Jarvis, A. (2008): New global hydrography\n derived from spaceborne elevation data. Eos, Transactions, AGU,\n 89(10): 93-94.\n\n### Explore with Earth Engine\n\n| **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)\n\n### Code Editor (JavaScript)\n\n```javascript\nvar dataset = ee.Image('WWF/HydroSHEDS/30ACC');\nvar flowAccumulation = dataset.select('b1');\nvar flowAccumulationVis = {\n min: 0.0,\n max: 500.0,\n palette: [\n '000000', '023858', '006837', '1a9850', '66bd63', 'a6d96a', 'd9ef8b',\n 'ffffbf', 'fee08b', 'fdae61', 'f46d43', 'd73027'\n ],\n};\nMap.setCenter(-121.652, 38.022, 8);\nMap.addLayer(flowAccumulation, flowAccumulationVis, 'Flow Accumulation');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/WWF/WWF_HydroSHEDS_30ACC) \n[WWF HydroSHEDS Flow Accumulation, 30 Arc-Seconds](/earth-engine/datasets/catalog/WWF_HydroSHEDS_30ACC) \nHydroSHEDS is a mapping product that provides hydrographic information for regional and global-scale applications in a consistent format. It offers a suite of geo-referenced datasets (vector and raster) at various scales, including river networks, watershed boundaries, drainage directions, and flow accumulations. HydroSHEDS is based on elevation data obtained in 2000 ... \nWWF/HydroSHEDS/30ACC, accumulation,drainage,flow,geophysical,hydrography,hydrology,hydrosheds,srtm,surface-ground-water,water,wwf \n2000-02-11T00:00:00Z/2000-02-22T00:00:00Z \n-67.3 -180 62 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://www.hydrosheds.org/)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/WWF_HydroSHEDS_30ACC)"]]
