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 quantidade de área a montante (em número de células) que drena para cada célula. A camada de direção de drenagem é usada para definir quais células fluem para a célula de destino. O número de células acumuladas é essencialmente uma medida da área de captação a montante. No entanto, como o tamanho da célula do conjunto de dados do HydroSHEDS depende da latitude, o valor de acúmulo da célula não pode ser traduzido diretamente em áreas de drenagem em quilômetros quadrados. Os valores variam de 1 em áreas topográficas altas (fontes de rios) a números muito grandes (da ordem de milhões de células) nas fozes de grandes rios.
Esse conjunto de dados tem resolução de 15 segundos de arco. Os conjuntos de dados disponíveis a 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
1*
2,78651e+07*
metros
Acúmulo de fluxo
* 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 flow accumulation, globally at various scales.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset, at 15 arc-second resolution, specifically represents the amount of upstream area draining into each cell, derived from SRTM elevation data.\u003c/p\u003e\n"],["\u003cp\u003eData quality is lower above 60 degrees northern latitude due to reliance on coarser-resolution DEM.\u003c/p\u003e\n"],["\u003cp\u003eHydroSHEDS data is free for both non-commercial and commercial use under the provided license agreement.\u003c/p\u003e\n"],["\u003cp\u003eDeveloped by WWF in partnership with USGS, CIAT, TNC, and the University of Kassel.\u003c/p\u003e\n"]]],[],null,["# WWF HydroSHEDS Flow Accumulation, 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[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 is at 15 arc-second resolution. The datasets available\nat 15 arc-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\n463.83 meters\n\n**Bands**\n\n| Name | Min | Max | Pixel Size | Description |\n|------|-----|---------------|------------|-------------------|\n| `b1` | 1\\* | 2.78651e+07\\* | 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/15ACC');\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_15ACC) \n[WWF HydroSHEDS Flow Accumulation, 15 Arc-Seconds](/earth-engine/datasets/catalog/WWF_HydroSHEDS_15ACC) \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/15ACC, 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_15ACC)"]]
