O HydroSHEDS é um produto de mapeamento que fornece informações hidrográficas para aplicativos regionais e globais em um formato consistente. Ele oferece um conjunto de dados georreferenciados (vetor e raster) em várias escalas, incluindo redes de rios, limites de bacias hidrográficas, direções de drenagem e acúmulos de fluxo. O HydroSHEDS é baseado em dados de elevação obtidos em 2000 pela Missão de Topografia por Radar do Ônibus Espacial (SRTM, na sigla em inglês) da NASA.
Esse conjunto de dados de elevação condicionado hidrologicamente é o resultado de um processo iterativo de condicionamento e correção.
O processo de condicionamento altera o DEM original e pode torná-lo incorreto para aplicativos que não sejam de derivação de direções de drenagem. As bacias endorreicas (depressões continentais) são "inseridas" com uma célula sem dados no ponto mais baixo para interromper o fluxo. Os detalhes completos do modelo digital de elevação estão disponíveis no site e na documentação do HydroSHEDS.
Esse conjunto de dados tem resolução de 3 segundos de arco. Os conjuntos de dados disponíveis em 3 segundos de arco são o DEM preenchido com vazio, o DEM condicionado hidrologicamente e a direção de drenagem (fluxo).
Há duas áreas com valores negativos incorretos de -100 perto de Vancouver, Canadá, em torno de (50,16, -123,85) e Austrália (-14,96, 129,62)
Bandas
Tamanho do pixel 92,77 metros
Bandas
Nome
Unidades
Mín.
Máx.
Tamanho do pixel
Descrição
b1
m
-440*
8527*
metros
Elevação
* valor mínimo ou máximo estimado
Termos de Uso
Termos de Uso
Os dados do HydroSHEDS são sem custo financeiro para uso não comercial e comercial. Para mais informações, consulte o contrato de licença.
Citações
Citações:
Lehner, B., Verdin, K., Jarvis, A. (2008): New global hydrography
derived from spaceborne elevation data. Eos, Transactions, AGU,
89(10): 93-94.
O HydroSHEDS é um produto de mapeamento que fornece informações hidrográficas para aplicativos regionais e globais em um formato consistente. Ele oferece um conjunto de dados georreferenciados (vetoriais e raster) em várias escalas, incluindo redes de rios, limites de bacias hidrográficas, direções de drenagem e acúmulos de fluxo. O HydroSHEDS se baseia em dados de elevação obtidos em 2000…
[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)"]]
