WorldPop works to ensure that every person is mapped and counted in decision making. WorldPop is an applied research and implementation group based at the University of Southampton and develops open, academically peer-reviewed methods for mapping populations at high spatial resolution across the globe. Since 2013, they have partnered with governments, UN agencies and donors to construct more than 45,000 demographic datasets, complementing traditional population sources with dynamic, high-resolution data from satellites and cellphones for mapping human population distributions.
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Constrained estimates, total number of people per grid-cell. The dataset is available to download in Geotiff format at a resolution of 3 arc (approximately 100m at the equator). The projection is Geographic Coordinate System, WGS84. The units are number of people per pixel. The mapping approach is Random Forest-based dasymetric redistribution.
More information can be found in the Release Statement
The difference between constrained and unconstrained is explained on this page: https://www.worldpop.org/methods/top_down_constrained_vs_unconstrained