Esse conjunto de dados contém estimativas da área de água (gelo permanente e água) em cada pixel e foi usado para calcular os conjuntos de dados de densidade populacional do GPW v4.11.
A versão 4 da população em grade do mundo (GPWv4), revisão 11, modela a distribuição da população humana global para os anos de 2000, 2005, 2010, 2015 e 2020 em células de grade de 30 segundos de arco (aproximadamente 1 km). A população é distribuída para células usando a alocação proporcional de população de unidades administrativas e do censo. Os dados de entrada da população são coletados na resolução espacial mais detalhada disponível nos resultados da rodada de censos de 2010, que ocorreu entre 2005 e 2014. Os dados de entrada são extrapolados para produzir estimativas de população para cada ano modelado.
Bandas
Tamanho do pixel 927,67 metros
Bandas
Nome
Mín.
Máx.
Tamanho do pixel
Descrição
water_area
0*
0,860558*
metros
Estimativas para a área de água em cada pixel de 30 segundos de arco.
Center for International Earth Science Information Network - CIESIN -
Columbia University. 2018. Gridded Population of the World, Version 4
(GPWv4): Water Area, Revision 11.
Palisades, NY: NASA Socioeconomic Data and Applications Center
(SEDAC). https://doi.org/10.7927/H4Z60M4Z.
Acessado em DIA MÊS ANO.
Esse conjunto de dados contém estimativas da área de água (gelo permanente e água) em cada pixel e foi usado para calcular os conjuntos de dados de densidade populacional do GPW v4.11. Documentação geral: a versão 4 da população em grade do mundo (GPWv4), revisão 11, modela a distribuição da população humana global para os anos de 2000, 2005, …
[null,null,[],[[["\u003cp\u003eThe GPWv411: Water Area dataset provides estimates of permanent ice and water area within each pixel at a 30 arc-second resolution (approximately 1km).\u003c/p\u003e\n"],["\u003cp\u003eThis dataset covers the period from 2000 to 2020 and was used to calculate population density for the Gridded Population of the World Version 4 (GPWv4) dataset.\u003c/p\u003e\n"],["\u003cp\u003eWater area is modeled using proportional allocation from census and administrative units and is available through the NASA Socioeconomic Data and Applications Center (SEDAC).\u003c/p\u003e\n"],["\u003cp\u003eThe dataset is freely accessible under the CC-BY-4.0 license and can be explored using Google Earth Engine.\u003c/p\u003e\n"],["\u003cp\u003eData is provided by NASA SEDAC at the Center for International Earth Science Information Network.\u003c/p\u003e\n"]]],[],null,["# GPWv411: Water Area (Gridded Population of the World Version 4.11)\n\nDataset Availability\n: 2000-01-01T00:00:00Z--2020-01-01T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA SEDAC at the Center for International Earth Science Information Network](https://doi.org/10.7927/H4Z60M4Z)\n\nTags\n:\n[ciesin](/earth-engine/datasets/tags/ciesin) [gpw](/earth-engine/datasets/tags/gpw) [nasa](/earth-engine/datasets/tags/nasa) [population](/earth-engine/datasets/tags/population) [surface-ground-water](/earth-engine/datasets/tags/surface-ground-water) \n\n#### Description\n\nThis dataset contains estimates of the water area (permanent ice and water)\nwithin each pixel, and was used to calculate the GPW v4.11 population density\ndatasets.\n\n[General Documentation](https://sedac.ciesin.columbia.edu/data/set/gpw-v4-land-water-area-rev11/docs)\n\nThe Gridded Population of World Version 4 (GPWv4), Revision 11 models the distribution\nof global human population for the years 2000, 2005, 2010, 2015, and 2020\non 30 arc-second (approximately 1 km) grid cells. Population is distributed\nto cells using proportional allocation of population from census and\nadministrative units. Population input data are collected at the most\ndetailed spatial resolution available from the results of the 2010 round of\ncensuses, which occurred between 2005 and 2014. The input data are\nextrapolated to produce population estimates for each modeled year.\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| `water_area` | 0\\* | 0.860558\\* | meters | Estimates for water area within each 30-arc second pixel. |\n\n\\* estimated min or max value\n\n### Terms of Use\n\n**Terms of Use**\n\n[CC-BY-4.0](https://spdx.org/licenses/CC-BY-4.0.html)\n\n### Citations\n\nCitations:\n\n- Center for International Earth Science Information Network - CIESIN -\n Columbia University. 2018. Gridded Population of the World, Version 4\n (GPWv4): Water Area, Revision 11.\n Palisades, NY: NASA Socioeconomic Data and Applications Center\n (SEDAC). \u003chttps://doi.org/10.7927/H4Z60M4Z\u003e.\n Accessed DAY MONTH YEAR.\n\n### DOIs\n\n- \u003chttps://doi.org/10.7927/H4Z60M4Z\u003e\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.ImageCollection('CIESIN/GPWv411/GPW_Water_Area');\nvar raster = dataset.select('water_area');\nvar raster_vis = {\n 'min': 0.0,\n 'palette': [\n 'f5f6da',\n '180d02'\n ],\n 'max': 0.860558\n};\nMap.setCenter(79.1, 19.81, 3);\nMap.addLayer(raster, raster_vis, 'water_area');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/CIESIN/CIESIN_GPWv411_GPW_Water_Area) \n[GPWv411: Water Area (Gridded Population of the World Version 4.11)](/earth-engine/datasets/catalog/CIESIN_GPWv411_GPW_Water_Area) \nThis dataset contains estimates of the water area (permanent ice and water) within each pixel, and was used to calculate the GPW v4.11 population density datasets. General Documentation The Gridded Population of World Version 4 (GPWv4), Revision 11 models the distribution of global human population for the years 2000, 2005, ... \nCIESIN/GPWv411/GPW_Water_Area, ciesin,gpw,nasa,population,surface-ground-water \n2000-01-01T00:00:00Z/2020-01-01T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.7927/H4Z60M4Z](https://doi.org/https://doi.org/10.7927/H4Z60M4Z)\n- [https://doi.org/10.7927/H4Z60M4Z](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/CIESIN_GPWv411_GPW_Water_Area)"]]
