哥倫比亞大學國際地球科學資訊網路中心 (CIESIN)。2018 年。世界網格化人口資料集第 4 版 (GPWv4)：國家/地區 ID 格線，修訂版 11。Palisades, NY: NASA Socioeconomic Data
and Applications Center (SEDAC). https://doi.org/10.7927/H4F47M2C。
檢索日期：DAY MONTH YEAR。
[null,null,[],[[["\u003cp\u003eThe GPWv4.11 National Identifier Grid dataset identifies the census data sources used for the Gridded Population of the World Version 4 (GPWv4) population estimates.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset, provided by NASA SEDAC, covers the period from 2000 to 2020 and has a spatial resolution of approximately 1km (30 arc-seconds).\u003c/p\u003e\n"],["\u003cp\u003ePixels with the same value within the dataset represent the same data source, typically a country or territory.\u003c/p\u003e\n"],["\u003cp\u003eGPWv4.11 models the distribution of the global human population using data from the 2010 round of censuses, extrapolated to produce estimates for each modeled year.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset is available through Google Earth Engine and is licensed under CC-BY-4.0.\u003c/p\u003e\n"]]],["The dataset from NASA SEDAC, available from 2000 to 2020, provides census data sources for GPWv4 population estimates. It models global population distribution on a 1km grid for 2000, 2005, 2010, 2015, and 2020. Each pixel in the 'national_identifier_grid' band, with values ranging from 4 to 999, indicates a unique census data source, often representing a country or territory. Access and analysis are available through Google Earth Engine, and the data is under a CC-BY-4.0 license.\n"],null,["# GPWv411: National Identifier Grid (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/H4TD9VDP)\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 represents the Census data source used to produce\nthe GPW v4.11 populations estimates. Pixels that have the same value reflect the same\ndata source, most often a country or territory.\n\n[General Documentation](https://sedac.ciesin.columbia.edu/data/set/gpw-v4-national-identifier-grid-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| `national_identifier_grid` | 4\\* | 999\\* | meters | An integer that represents the census data source used to produce the GPWv4.11 population estimates. Pixels (grid cells) that have the same value reflect the same data source, most often a country or territory. Note that these data represent the area covered by the statistical data as provided, and are not official representations of country or territory boundaries. |\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): National Identifier Grid, Revision 11. Palisades, NY: NASA Socioeconomic Data\n and Applications Center (SEDAC). \u003chttps://doi.org/10.7927/H4F47M2C\u003e.\n Accessed DAY MONTH YEAR.\n\n### DOIs\n\n- \u003chttps://doi.org/10.7927/H4TD9VDP\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_National_Identifier_Grid');\nvar raster = dataset.select('national_identifier_grid');\nvar raster_vis = {\n 'min': 4.0,\n 'palette': [\n '000000',\n 'ffffff'\n ],\n 'max': 999.0\n};\nMap.setCenter(-88.6, 26.4, 1);\nMap.addLayer(raster, raster_vis, 'national_identifier_grid');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/CIESIN/CIESIN_GPWv411_GPW_National_Identifier_Grid) \n[GPWv411: National Identifier Grid (Gridded Population of the World Version 4.11)](/earth-engine/datasets/catalog/CIESIN_GPWv411_GPW_National_Identifier_Grid) \nThis dataset represents the Census data source used to produce the GPW v4.11 populations estimates. Pixels that have the same value reflect the same data source, most often a country or territory. General Documentation The Gridded Population of World Version 4 (GPWv4), Revision 11 models the distribution of global human ... \nCIESIN/GPWv411/GPW_National_Identifier_Grid, 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/H4TD9VDP](https://doi.org/https://doi.org/10.7927/H4TD9VDP)\n- [https://doi.org/10.7927/H4TD9VDP](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/CIESIN_GPWv411_GPW_National_Identifier_Grid)"]]
