WorldPop
Fig 2: Domestic travel and contact levels by country/territory across 135 countries or territories.

Travel and physical distancing interventions have been implemented across the World to mitigate the COVID-19 pandemic, but studies are needed to quantify the effectiveness of these measures across regions and time. Timely population mobility data were obtained to measure travel and contact reductions in 135 countries or territories. During the…

Figure 1: P. falciparum migration communities for the Africa and Arabian Peninsula region. Each map represents a different stage of country-merging into communities connected by relatively higher levels of infection movements than to the surrounding regions, with community membership shown by color. For instance, the bottom-left map shows that Mali, Burkina Faso, Côte d’Ivoire, and Ghana form a community (colored red). The plot in the center shows the overall strength (measured by modularity score) of clustering at different stages of merging countries together into communities. The stage that each map shown represents is identified by the connecting lines.

Calls for the eradication of malaria require the development of global and regional strategies based on a strong and consistent evidence base. Evidence from the previous global malaria eradication program and more recent transborder control campaigns have shown the importance of accounting for human movement in introducing infections to areas…

Figure 3: Estimated people per grid cell for Latin America and the Caribbean in 2010 (excluding Guadalupe, Martinique, Bahamas, Barbados, Saint Lucia, Curaçao, Aruba, Saint Vincent and The Grenadines, US and British Virgin Islands, Grenada, Dominica, Cayman Islands, Saint Kitts and Nevis, Sint Maarten, Turks and Caicos Islands, Saint Martin, Caribbean Netherlands, Anguilla, Saint Barthélemy, and Montserrat). The grid cell resolution is 3 arc seconds (approximately 100 m at the equator) and coordinates refer to GCS WGS 1984. For illustrative purpose, the color ranges used are country-specific.

The Latin America and the Caribbean region is one of the most urbanized regions in the world, with a total population of around 630 million that is expected to increase by 25% by 2050. In this context, detailed and contemporary datasets accurately describing the distribution of residential population in the…

Figure 6: Estimated internal human migration flows between subnational administrative units for every malaria endemic country in Latin America and the Caribbean (Supplementary Table 1). Coordinates for all three panels refer to GCS WGS 1984. For illustrative purposes, subnational unit boundaries are shown only in the insets and the colour ranges used to represent the flows are country-specific (refer to Supplementary Fig. 3 for additional close-up views of internal migration flows in Latin America and Caribbean).

Human mobility continues to increase in terms of volumes and reach, producing growing global connectivity. This connectivity hampers efforts to eliminate infectious diseases such as malaria through reintroductions of pathogens, and thus accounting for it becomes important in designing global, continental, regional, and national strategies. Recent works have shown that census-derived migration data provides a good proxy for internal connectivity, in terms of relative strengths of movement between administrative units, across temporal scales. To support global malaria eradication strategy efforts, here we describe the construction of an open access archive of estimated internal migration flows in endemic countries built through pooling of census microdata. These connectivity datasets, described here along with the approaches and methods used to create and validate them, are available both through the WorldPop website and the WorldPop Dataverse Repository.

Read more here: https://www.nature.com/articles/sdata201666

https://doi.org/10.1038/sdata.2016.66

Figure 2: An excerpt of selected WorldPop gridded datasets at 100 m resolution, in plan view and as pseudo 3d stacks. The village of Dibyanagar, Southern Nepal, and surrounding region. Layers (in ascending order) are topography; slope; country ID; country area; Globcover60 land cover; GPW v4 (ref. 11) population count; GPW v4 (ref. 11) population density; Landsat62 water; and OSM64 water, highways, rail network, railway stations, runways, and heliports.

Recent years have seen substantial growth in openly available satellite and other geospatial data layers, which represent a range of metrics relevant to global human population mapping at fine spatial scales. The specifications of such data differ widely and therefore the harmonisation of data layers is a prerequisite to constructing…

Figure 1: Examples of WorldPop datasets. a) Population distribution in 2010 across south America from Sorichetta et al.; b) Population distributions mapped in southern China in 1990 (top) and 2010 (bottom) from Gaughan et al.5; c) Internal migration flow estimates across sub-Saharan Africa from Sorichetta et al.7; d) Stack of geospatial data layers that form a central component to WorldPop population mapping, from Lloyd et al.3

High resolution, contemporary data on human population distributions, their characteristics and changes over time are a prerequisite for the accurate measurement of the impacts of population growth, for monitoring changes and for planning interventions. WorldPop aims to meet these needs through the provision of detailed and open access spatial demographic datasets built using transparent approaches. The Scientific Data WorldPop collection brings together descriptor papers on these datasets and is introduced here.

Read more here: https://www.nature.com/articles/sdata20174#citeas

Figure 1: Predicted prevalence and absolute change in i) skilled birth attendance (blue), ii) 4+ antenatal care visits (green), and iii) postnatal check-up within 48 h (red) among administrative II units, among DHS data in a) Kenya, 2003–2014 b) Tanzania, 1999–2015, c) Rwanda, 2005–2014, and d) Uganda, 2000–2011

Background

Sub-Saharan Africa continues to account for the highest regional maternal mortality ratio (MMR) in the world, at just under 550 maternal deaths per 100,000 live births in 2015, compared to a global rate of 216 deaths. Spatial inequalities in access to life-saving maternal and newborn health (MNH) services persist within…

Figure 2. Geospatial raster layers produced for potential input to a population model

Multi-temporal, globally consistent, high-resolution human population datasets provide consistent and comparable population distributions in support of mapping sub-national heterogeneities in health, wealth, and resource access, and monitoring change in these over time. The production of more reliable and spatially detailed population datasets is increasingly necessary due to the importance of…

Figure 6: Origin-destination networks and communities of malaria importation into China, 2011–2016. a The numbers and species of malaria imported from origins (68 countries) into destinations (31 provinces) in mainland China. b Four communities of the malaria importation networks. The proportion of Plasmodium species are presented for countries with ≥ 10 cases

Background

Historically, malaria had been a widespread disease in China. A national plan was launched in China in 2010, aiming to eliminate malaria by 2020. In 2017, no indigenous cases of malaria were detected in China for the first time. …

Figure 1: Census-derived internal migration in Namibia, September 2010–August 2011. a Net migration by region. The number of net migrants by region is presented under the name of each region. b Circular plot of migrant flows between regions. The origins and destinations of migrants are each assigned a color and represented by the circle’s segments. The direction of the flow is encoded by both the origin region’s color and a gap between the flow and the destination region’s segment. The volume of movement is indicated by the width of the flow at the beginning and end points. Tick marks on the circle segments show the number of migrants (inflows and outflows)

Statistics on internal migration are important for keeping estimates of subnational population numbers up-to-date, as well as urban planning, infrastructure development, and impact assessment, among other applications. However, migration flow statistics typically remain constrained by the logistics of infrequent censuses or surveys. The penetration rate of mobile phones is now…

WorldPop

WorldPop develops peer-reviewed research and methods for the construction of open and high-resolution geospatial data on population distributions.

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