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 define a direção do fluxo de cada célula no DEM condicionado para o vizinho de declive mais íngreme. Os valores da direção de drenagem variam de 1 a 128. Todas as células finais de saída para o oceano são sinalizadas com o valor 0. Todas as células que marcam o ponto mais baixo de uma bacia endorreica (depressão continental) são sinalizadas com o valor -1. Os valores de direção de drenagem seguem a convenção adotada pela implementação de direção de fluxo da ESRI: 1=E, 2=SE, 4=S, 8=SW, 16=W, 32=NW, 64=N, 128=NE.
Esse conjunto de dados tem resolução de 15 segundos de arco.
Os conjuntos de dados disponíveis em 15 segundos de arco são o DEM condicionado hidrologicamente, a direção de drenagem (fluxo) e o acúmulo de fluxo.
A qualidade dos dados do HydroSHEDS é significativamente menor para regiões acima de 60 graus de latitude norte, já que não há dados de elevação do SRTM disponíveis. Por isso, foi usado um DEM de resolução mais baixa (HYDRO1k fornecido pelo USGS).
O HydroSHEDS foi desenvolvido pelo Programa de Ciência da Conservação do World Wildlife Fund (WWF) em parceria com o Serviço Geológico dos EUA, o Centro Internacional de Agricultura Tropical, a Nature Conservancy e o Centro de Pesquisa de Sistemas Ambientais da Universidade de Kassel, na Alemanha.
Bandas
Tamanho do pixel 463,83 metros
Bandas
Nome
Mín.
Máx.
Tamanho do pixel
Descrição
b1
0*
255*
metros
Valores possíveis de direção de drenagem: 1=E, 2=SE, 4=S, 8=SW, 16=W, 32=NW, 64=N, 128=NE. As células de saída final para o oceano são sinalizadas com um valor de 0, e as células que marcam o ponto mais baixo de uma bacia endorreica (sumidouro continental) são sinalizadas com um valor de 255 (valor original de -1).
* 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, watershed boundaries, and drainage directions at various scales.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset is based on NASA's SRTM elevation data from 2000 and uses a drainage direction schema where values indicate flow direction.\u003c/p\u003e\n"],["\u003cp\u003eIt is available at 15 arc-second resolution and has lower quality above 60 degrees northern latitude due to limitations in underlying elevation data.\u003c/p\u003e\n"],["\u003cp\u003eHydroSHEDS is free for non-commercial and commercial use under its license agreement.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset was developed by WWF in collaboration with USGS, CIAT, TNC, and the Center for Environmental Systems Research.\u003c/p\u003e\n"]]],["The HydroSHEDS dataset, provided by WWF, offers hydrographic data from 2000, focusing on drainage direction. Key data includes flow direction from each cell to its steepest down-slope neighbor, with values 1-128, ocean outlets flagged as 0, and inland sinks as -1 (represented as 255). The 15 arc-second resolution data covers conditioned DEM, drainage direction, and flow accumulation, derived from NASA's SRTM. It's available for free use, and accessible via Earth Engine using `ee.Image(\"WWF/HydroSHEDS/15DIR\")`.\n"],null,["# WWF HydroSHEDS Drainage Direction, 15 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[direction](/earth-engine/datasets/tags/direction) [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 drainage direction dataset defines the direction\nof flow from each cell in the conditioned DEM to its steepest\ndown-slope neighbor. Values of drainage direction vary from 1\nto 128. All final outlet cells to the ocean are flagged with\na value of 0. All cells that mark the lowest point of an endorheic\nbasin (inland sink) are flagged with a value of -1. The drainage\ndirection values follow the convention adopted by ESRI's flow\ndirection implementation: 1=E, 2=SE, 4=S, 8=SW, 16=W, 32=NW,\n64=N, 128=NE.\n\nThis dataset is at 15 arc-second resolution.\nThe datasets available at 15 arc-seconds are the Hydrologically\nConditioned DEM, Drainage (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\n463.83 meters\n\n**Bands**\n\n| Name | Min | Max | Pixel Size | Description |\n|------|-----|-------|------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `b1` | 0\\* | 255\\* | meters | Drainage direction possible values: 1=E, 2=SE, 4=S, 8=SW, 16=W, 32=NW, 64=N, 128=NE; final outlet cells to the ocean are flagged with a value of 0 and cells that mark the lowest point of an endorheic basin (inland sink) are flagged with a value of 255 (original value of -1) |\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/15DIR');\nvar drainageDirection = dataset.select('b1');\nvar drainageDirectionVis = {\n min: 1.0,\n max: 128.0,\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(drainageDirection, drainageDirectionVis, 'Drainage Direction');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/WWF/WWF_HydroSHEDS_15DIR) \n[WWF HydroSHEDS Drainage Direction, 15 Arc-Seconds](/earth-engine/datasets/catalog/WWF_HydroSHEDS_15DIR) \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/15DIR, direction,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_15DIR)"]]
