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The Gridded Population of the World, Version 4 (GPWv4): Population Density, Revision 11 consists of estimates of human population density (number of persons per square kilometer) based on counts consistent with national censuses and population registers, for the years 2000, 2005, 2010, 2015, and 2020.�A proportional allocation gridding algorithm, utilizing approximately 13.5 million ...
Population. Refers to the total number of inhabitants constituting a particular race, class, or group in a specified area. Definition source: United Nations.
Urbanization/Urban Sprawl. Researchers track the effects of urbanization using satellite data of phenomena such as nighttime lights, deforestation, and heat islands. Between 2018 and 2050, the world’s urban population is expected to grow by 2.5 billion, an addition of about 170,000 people a day, according to estimates by the United Nations.
Urbanization is the expansion of metropolitan areas by building housing developments and shopping centers farther and farther from urban centers and placing them together with more major highways. An outcome of urbanization is the fact that as more highways are built, surfaces are sealed with pavement, increasing stormwater runoff and quickening concentration times. Urban sprawl refers to the ...
Data Tools. Access a range of tools that enable data discovery, analysis, and visualization. NASA SEDAC's flagship Gridded Population of the World (GPW) data product provides population size and density from the 2010 round of censuses in a gridded format (30 arc-seconds) that is easily combined with earth science data.
Around 800 A.D., after two millennia of steady growth, the Mayan population reached an all-time high. Population density ranged from 500 to 700 people per square mile in the rural areas, and from 1,800 to 2,600 people per square mile near the center of the Mayan Empire (in what is now northern Guatemala).
A gardening company would like to predict the density of the weed population in a yard before it is sprayed with pesticide. The yard measures 200 cm × 100 cm. The gardener places four 2.0 cm × 1.0 cm quadrats randomly in the park, and calculates the weed counts of 22, 46, 32 and 40 weeds in the 4 quadrats.
SEDAC synthesizes Earth science and socioeconomic data and information in ways useful to a wide range of decision-makers and other applied users, and seeks to improve access to and use of key socioeconomic and interdisciplinary data that are or can be integrated with remote sensing data. SEDAC develops and maintains extensive fundamental data ...
The population density grids are derived by dividing the population count grids by the land area grid and represent persons per square kilometer. The grids are available in various GIS-compatible data formats and geographic extents (global, continent [Antarctica not included], and country levels).
The Global Rural-Urban Mapping Project, Version 1 (GRUMPv1): Population Density Grid estimates population per square km for the years 1990, 1995, and 2000 by 30 arc-second (1km) grid cells and associated data sets dated circa 2000.