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.
Hidrolojik olarak koşullandırılmış bu yükseklik veri kümesi, yinelemeli bir koşullandırma ve düzeltme sürecinin sonucudur.
Hazırlama sürecinin orijinal DEM'i değiştirdiğini ve drenaj yönlerini belirleme dışındaki uygulamalar için yanlış hale getirebileceğini unutmayın. Kapalı havzaların (iç kısımdaki çöküntüler) akışı sonlandırmak için en düşük noktalarına veri içermeyen bir hücre "yerleştirilir". Temel dijital yükseklik modeliyle ilgili tüm ayrıntılara HydroSHEDS web sitesi ve dokümanlarından ulaşabilirsiniz.
Bu veri kümesi 3 yay saniyesi çözünürlüğe sahiptir. 3 yay saniyesi çözünürlükte kullanılabilen veri kümeleri; boşluk doldurulmuş DEM, hidrolojik olarak koşullandırılmış DEM ve drenaj (akış) yönüdür.
Kanada'da Vancouver yakınlarında (50.16, -123.85) ve Avustralya'da (-14.96, 129.62) olmak üzere iki bölgede -100 değerine yakın yanlış negatif değerler var.
Bantlar
Piksel Boyutu 92,77 metre
Bantlar
Ad
Birimler
Min.
Maks.
Piksel Boyutu
Açıklama
b1
dk.
-440*
8527*
metre
Rakım
* 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 provides hydrographic information like river networks and watershed boundaries at various scales, globally.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset is a hydrologically conditioned elevation model derived from SRTM data and is best suited for drainage analysis.\u003c/p\u003e\n"],["\u003cp\u003eIt's available at a 3 arc-second resolution (approximately 92 meters) and covers the globe with elevation data.\u003c/p\u003e\n"],["\u003cp\u003eHydroSHEDS data is free for both non-commercial and commercial use under its license agreement.\u003c/p\u003e\n"],["\u003cp\u003eWhile generally accurate, there are two known areas with incorrect negative elevation values near Vancouver, Canada, and Australia.\u003c/p\u003e\n"]]],[],null,["# WWF HydroSHEDS Hydrologically Conditioned DEM, 3 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[conditioned](/earth-engine/datasets/tags/conditioned) [dem](/earth-engine/datasets/tags/dem) [elevation](/earth-engine/datasets/tags/elevation) [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) [topography](/earth-engine/datasets/tags/topography) [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 hydrologically conditioned elevation dataset is\nthe result of an iterative conditioning and correction process.\nNote that the conditioning process alters the original DEM and\nmay render it incorrect for applications other than deriving drainage\ndirections. Endorheic basins (inland sinks) are ''seeded'' with\na no-data cell at their lowest point in order to terminate the\nflow. Full details of the underlying digital elevation model are\navailable in the HydroSHEDS website and documentation.\n\nThis dataset is at 3 arc-second resolution. The datasets available\nat 3 arc-seconds are the Void-Filled DEM, Hydrologically Conditioned\nDEM, and Drainage (Flow) Direction.\n\nThere are two areas with incorrect negative values of -100\nclose to Vancouver, Canada around (50.16, -123.85) and Australia\n(-14.96, 129.62)\n\n### Bands\n\n\n**Pixel Size**\n\n92.77 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|------|-------|--------|--------|------------|-------------|\n| `b1` | m | -440\\* | 8527\\* | meters | Elevation |\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/03CONDEM');\nvar elevation = dataset.select('b1');\nvar elevationVis = {\n min: -50.0,\n max: 3000.0,\n gamma: 2.0,\n};\nMap.setCenter(-121.652, 38.022, 8);\nMap.addLayer(elevation, elevationVis, 'Elevation');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/WWF/WWF_HydroSHEDS_03CONDEM) \n[WWF HydroSHEDS Hydrologically Conditioned DEM, 3 Arc-Seconds](/earth-engine/datasets/catalog/WWF_HydroSHEDS_03CONDEM) \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/03CONDEM, conditioned,dem,elevation,geophysical,hydrography,hydrology,hydrosheds,srtm,surface-ground-water,topography,water,wwf \n2000-02-11T00:00:00Z/2000-02-22T00:00:00Z \n-67.3 -180 60 180 \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_03CONDEM)"]]
