Cet ensemble de données contient des estimations de la superficie en eau (eau et glace permanentes) dans chaque pixel. Il a été utilisé pour calculer les ensembles de données sur la densité de population GPW v4.11.
La version 4 (révision 11) de la grille de population mondiale (GPWv4) modélise la répartition de la population humaine mondiale pour les années 2000, 2005, 2010, 2015 et 2020 dans des cellules de grille de 30 secondes d'arc (environ 1 km). La population est répartie dans les cellules à l'aide d'une allocation proportionnelle de la population à partir des unités administratives et de recensement. Les données de population en entrée sont collectées à la résolution spatiale la plus détaillée disponible à partir des résultats de la série de recensements de 2010, qui ont eu lieu entre 2005 et 2014. Les données d'entrée sont extrapolées pour produire des estimations de population pour chaque année modélisée.
Bracelets
Taille des pixels 927,67 mètres
Bandes de fréquences
Nom
Min
Max
Taille des pixels
Description
water_area
0*
0,860558*
mètres
Estimations de la superficie en eau dans chaque pixel de 30 secondes d'arc.
Center for International Earth Science Information Network – CIESIN – Université de Columbia. 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.
Consulté le JOUR MOIS ANNÉE.
Cet ensemble de données contient des estimations de la superficie en eau (eau et glace permanentes) dans chaque pixel. Il a été utilisé pour calculer les ensembles de données sur la densité de population GPW v4.11. Documentation générale Les modèles Gridded Population of World Version 4 (GPWv4), révision 11, modélisent la distribution de la population humaine mondiale pour les années 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)"]]
