哥伦比亚大学国际地球科学信息网络中心 (CIESIN)。2018 年。Gridded Population of the World, Version 4
(GPWv4): Data Context, Revision 11. Palisades, NY: NASA Socioeconomic Data
and Applications Center (SEDAC). doi:10.7927/H42Z13KG.
访问日期：DAY MONTH YEAR。
[null,null,[],[[["\u003cp\u003eThe Gridded Population of the World Version 4 (GPWv4), Revision 11 dataset models the distribution of global human population from 2000-2020 on a 30 arc-second grid.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset categorizes pixels with estimated zero population based on census information, using a "data_context" band with values corresponding to classifications like parks, infrastructure, or uninhabited areas.\u003c/p\u003e\n"],["\u003cp\u003ePopulation data is distributed using proportional allocation from census and administrative units, primarily based on the 2010 round of censuses.\u003c/p\u003e\n"],["\u003cp\u003eProvided by NASA SEDAC at the Center for International Earth Science Information Network, the dataset is available under the CC-BY-4.0 license.\u003c/p\u003e\n"],["\u003cp\u003eIt has a resolution of 927.67 meters and includes a single band called \u003ccode\u003edata_context\u003c/code\u003e which provides the population context classification for each pixel.\u003c/p\u003e\n"]]],[],null,["# GPWv411: Data Context (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/H42Z13KG)\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) \n\n#### Description\n\nThis dataset categorizes pixels with estimated zero population based on\ninformation provided in the census documents.\n\n[General Documentation](https://sedac.ciesin.columbia.edu/data/set/gpw-v4-admin-unit-center-points-population-estimates-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| `data_context` | 0\\* | 207\\* | meters | Categorizes pixels with estimated zero population based on information provided in the census documents. |\n\n\\* estimated min or max value\n\n**data_context Class Table**\n\n| Value | Color | Description |\n|-------|---------|----------------------------------------------------------|\n| 0 | #ffffff | Not Applicable |\n| 201 | #099506 | Park or protected area |\n| 202 | #f04923 | Military district, airport zone, or other infrastructure |\n| 203 | #e62440 | Not enumerated or not reported in census |\n| 204 | #706984 | No households |\n| 205 | #a5a5a5 | Uninhabited |\n| 206 | #d4cc11 | Population not gridded |\n| 207 | #000000 | Missing age or sex data |\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): Data Context, Revision 11. Palisades, NY: NASA Socioeconomic Data\n and Applications Center (SEDAC). [doi:10.7927/H42Z13KG](https://doi.org/10.7927/H42Z13KG).\n Accessed DAY MONTH YEAR.\n\n### DOIs\n\n- \u003chttps://doi.org/10.7927/H42Z13KG\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_Data_Context');\nvar raster = dataset.select('data_context');\nvar raster_vis = {\n 'min': 200.0,\n 'palette': [\n 'ffffff',\n '099506',\n 'f04923',\n 'e62440',\n '706984',\n 'a5a5a5',\n 'ffe152',\n 'd4cc11',\n '000000'\n ],\n 'max': 207.0\n};\nMap.setCenter(-88.6, 26.4, 1);\nMap.addLayer(raster, raster_vis, 'data_context');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/CIESIN/CIESIN_GPWv411_GPW_Data_Context) \n[GPWv411: Data Context (Gridded Population of the World Version 4.11)](/earth-engine/datasets/catalog/CIESIN_GPWv411_GPW_Data_Context) \nThis dataset categorizes pixels with estimated zero population based on information provided in the census documents. General Documentation The Gridded Population of World Version 4 (GPWv4), Revision 11 models the distribution of global human population for the years 2000, 2005, 2010, 2015, and 2020 on 30 arc-second (approximately 1 km) ... \nCIESIN/GPWv411/GPW_Data_Context, ciesin,gpw,nasa,population \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/H42Z13KG](https://doi.org/https://doi.org/10.7927/H42Z13KG)\n- [https://doi.org/10.7927/H42Z13KG](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/CIESIN_GPWv411_GPW_Data_Context)"]]
