تحتوي مجموعة البيانات هذه على تقديرات لمساحة المياه (الجليد والمياه الدائمة)
داخل كل بكسل، وقد تم استخدامها لاحتساب مجموعات بيانات الكثافة السكانية GPW v4.11.
يقدّم الإصدار 11 من "تعداد السكان في العالم" (GPWv4) توزيعًا
للسكان في العالم خلال الأعوام 2000 و2005 و2010 و2015 و2020
في خلايا شبكية تبلغ مساحتها 30 ثانية قوسية (كيلومتر واحد تقريبًا). يتم توزيع السكان على الخلايا باستخدام التوزيع النسبي للسكان من التعداد السكاني والوحدات الإدارية. يتم جمع بيانات السكان المدخلة بأعلى دقة مكانية متاحة من نتائج جولة التعدادات لعام 2010 التي أُجريت بين عامَي 2005 و2014. يتم استقراء بيانات الإدخال لإنتاج تقديرات عدد السكان لكل سنة تم وضع نموذج لها.
النطاقات
حجم البكسل 927.67 متر
النطاقات
الاسم
الحد الأدنى
الحد الأقصى
حجم البكسل
الوصف
water_area
0*
0.860558*
أمتار
تقديرات لمساحة المياه ضمن كل بكسل يبلغ 30 ثانية قوسية
مركز شبكة معلومات علوم الأرض الدولية (CIESIN) في "جامعة كولومبيا" 2018 Gridded Population of the World، الإصدار 4
(GPWv4): Water Area، المراجعة 11.
Palisades, NY: NASA Socioeconomic Data and Applications Center
(SEDAC). https://doi.org/10.7927/H4Z60M4Z.
تم الوصول إليه في DAY MONTH YEAR.
تحتوي مجموعة البيانات هذه على تقديرات لمساحة المياه (الجليد الدائم والمياه) داخل كل بكسل، وقد تم استخدامها لاحتساب مجموعات بيانات الكثافة السكانية في GPW الإصدار 4.11. General Documentation The Gridded Population of World Version 4 (GPWv4), Revision 11 models the distribution of global human population for the years 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)"]]
