Sérgio Freire
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View article: Advances on the Global Human Settlement Layer by joint assessment of Earth Observation and population survey data
Advances on the Global Human Settlement Layer by joint assessment of Earth Observation and population survey data Open
The Global Human Settlement Layer (GHSL) project fosters an enhanced, public understanding of the human presence on Earth. A decade after its inception in the Digital Earth 2020 vision, GHSL is an established project of the European Commis…
View article: The Multi-temporal and Multi-dimensional Global Urban Centre Database to Delineate and Analyse World Cities
The Multi-temporal and Multi-dimensional Global Urban Centre Database to Delineate and Analyse World Cities Open
Monitoring sustainable urban development requires comparable geospatial information on cities across several thematic domains. Here we present the first global database combining such information with city extents. The Global Human Settlem…
View article: Detecting Inequalities from Earth Observation–Derived Global Societal Variables
Detecting Inequalities from Earth Observation–Derived Global Societal Variables Open
Societal inequalities manifest at a range of scales, from coarse (inter-continent) to fine (intra-city). Satellite-measured night-time lights (NTL) have shown value for capturing and estimating socioeconomic characteristics, including econ…
View article: Estimating geographic access to healthcare facilities in Sub-Saharan Africa by Degree of Urbanisation
Estimating geographic access to healthcare facilities in Sub-Saharan Africa by Degree of Urbanisation Open
Measuring rates of coverage and spatial access to healthcare services is essential to inform policies for development. These rates tend to reflect the urban-rural divide, typically with urban areas experiencing higher accessibility than ru…
View article: A smart and flexible approach for aggregation of adjacent polygons to meet a minimum target area or attribute value
A smart and flexible approach for aggregation of adjacent polygons to meet a minimum target area or attribute value Open
Many geospatial analyses require flexible aggregation of adjacent units to meet a minimum target area or attribute value. This is usually accomplished using several non-automated and complex GIS tasks. We developed an integrated user-frien…
View article: Land use efficiency of functional urban areas: Global pattern and evolution of development trajectories
Land use efficiency of functional urban areas: Global pattern and evolution of development trajectories Open
The application of last-generation spatial data modelling, integrating Earth Observation, population, economic and other spatially explicit data, enables insights into the sustainability of the global urbanisation processes with unpreceden…
View article: Built-up areas are expanding faster than population growth: regional patterns and trajectories in Europe
Built-up areas are expanding faster than population growth: regional patterns and trajectories in Europe Open
Human settlements typically expand to accommodate additional housing demand from a growing population and their socio-economic activities. This implies consumption of land, a limited resource necessary for many other services. The efficien…
View article: GHS_STAT_DUC R2019A - GHS Degree of Urbanisation Classification (2015, 2000, 1990, 1975), R2019A
GHS_STAT_DUC R2019A - GHS Degree of Urbanisation Classification (2015, 2000, 1990, 1975), R2019A Open
This dataset contains the Global Degree of Urbanisation Classification of adminstrative units delineated by the Global ADMinistrative layer version 3.6 (GADM36) according to the application stage 2 of the Degree of Urbanisation. The classi…
View article: Open and Consistent Geospatial Data on Population Density, Built-Up and Settlements to Analyse Human Presence, Societal Impact and Sustainability: A Review of GHSL Applications
Open and Consistent Geospatial Data on Population Density, Built-Up and Settlements to Analyse Human Presence, Societal Impact and Sustainability: A Review of GHSL Applications Open
This review analyses peer-reviewed scientific publications and policy documents that use built-up density, population density and settlement typology spatial grids from the Global Human Settlement Layer (GHSL) project to quantify human pre…
View article: Applying the Degree of Urbanisation to the globe: A new harmonised definition reveals a different picture of global urbanisation
Applying the Degree of Urbanisation to the globe: A new harmonised definition reveals a different picture of global urbanisation Open
The Degree of Urbanisation is a new definition of cities, towns and semi-dense areas, and rural areas endorsed by the UN Statistical Commission. The urban population share according to the Degree of Urbanisation is similar to the one based…
View article: Modeling of population distribution in space and time to support disaster risk management
Modeling of population distribution in space and time to support disaster risk management Open
Despite its importance for Disaster Risk Management (DRM), the mapping of human distribution and population exposure has lagged behind hazard modeling and mapping. Assessing population exposure to actual or potential disasters can benefit …
View article: ENACT-POP R2020A - ENACT 2011 Population Grid
ENACT-POP R2020A - ENACT 2011 Population Grid Open
This spatial raster dataset depicts the distribution/density of population, expressed as the number of people per cell, during night-time and daytime for each month of 2011. The grids are produced by estimating the regional and monthly sto…
View article: Multi-Scale Estimation of Land Use Efficiency (SDG 11.3.1) across 25 Years Using Global Open and Free Data
Multi-Scale Estimation of Land Use Efficiency (SDG 11.3.1) across 25 Years Using Global Open and Free Data Open
Sustainable Development Goal (SDG) 11 aspires to “Make cities and human settlements inclusive, safe, resilient and sustainable”, and the introduction of an explicit urban goal testifies to the importance of urbanisation. The understanding …
View article: The spatial allocation of population: a review of large-scale gridded population data products and their fitness for use
The spatial allocation of population: a review of large-scale gridded population data products and their fitness for use Open
Population data represent an essential component in studies focusing on human–nature interrelationships, disaster risk assessment and environmental health. Several recent efforts have produced global- and continental-extent gridded populat…
View article: An Improved Global Analysis of Population Distribution in Proximity to Active Volcanoes, 1975–2015
An Improved Global Analysis of Population Distribution in Proximity to Active Volcanoes, 1975–2015 Open
Better and more detailed analyses of global human exposure to hazards and associated disaster risk require improved geoinformation on population distribution and densities. In particular, issues of temporal and spatial resolution are impor…
View article: GHS population grid multitemporal (1975-1990-2000-2015), R2019A
GHS population grid multitemporal (1975-1990-2000-2015), R2019A Open
The spatial raster dataset depicts the distribution of population, expressed as the number of people per cell. Residential population estimates for target years 1975, 1990, 2000 and 2015 provided by CIESIN GPWv4.10 were disaggregated from …
View article: Allocating people to pixels: A review of large-scale gridded population data products and their fitness for use
Allocating people to pixels: A review of large-scale gridded population data products and their fitness for use Open
Population data represent an essential component in studies focusing on human-nature interrelationships, disaster risk assessment and environmental health. Several recent efforts have produced global and continental-extent gridded populati…
View article: The Generalised Settlement Area: mapping the Earth surface in the vicinity of built-up areas
The Generalised Settlement Area: mapping the Earth surface in the vicinity of built-up areas Open
Geo-information on settlements from Earth Observation offers a base for objective and scalable monitoring of evolution of cities and settlements, including their location, extent and other attributes. In this work, we deploy the best avail…
View article: Enhanced data and methods for improving open and free global population grids: putting ‘leaving no one behind’ into practice
Enhanced data and methods for improving open and free global population grids: putting ‘leaving no one behind’ into practice Open
Data on global population distribution are a strategic resource currently in high demand, in an age of new Development Agendas that call for universal inclusiveness of people. However, quality, detail, and age of census data varies signifi…
View article: Increasing the detail of European land use/cover data by combining heterogeneous data sets
Increasing the detail of European land use/cover data by combining heterogeneous data sets Open
Data on land use and land cover (LULC) are a vital input for policy-relevant research, such as modelling of the human population, socioeconomic activities, transportation, environment, and their interactions. In Europe, CORINE Land Cover h…
View article: Remote Sensing Derived Built-Up Area and Population Density to Quantify Global Exposure to Five Natural Hazards over Time
Remote Sensing Derived Built-Up Area and Population Density to Quantify Global Exposure to Five Natural Hazards over Time Open
Exposure is reported to be the biggest determinant of disaster risk, it is continuously growing and by monitoring and understanding its variations over time it is possible to address disaster risk reduction, also at the global level. This …
View article: GHS built-up grid, derived from Landsat, multitemporal (1975-1990-2000-2014), R2018A
GHS built-up grid, derived from Landsat, multitemporal (1975-1990-2000-2014), R2018A Open
Multi-temporal information layer on the presence of built-up surfaces derived from global Landsat satellite data collected from 1975 to 2014, at the native spatial resolution varying from 80 meters (Landsat MSS sensor), 30 meters (Landsat …
View article: Unveiling 25 Years of Planetary Urbanization with Remote Sensing: Perspectives from the Global Human Settlement Layer
Unveiling 25 Years of Planetary Urbanization with Remote Sensing: Perspectives from the Global Human Settlement Layer Open
In the last few decades the magnitude and impacts of planetary urban transformations have become increasingly evident to scientists and policymakers. The ability to understand these processes remained limited in terms of territorial scope …
View article: Megacities Spatiotemporal Dynamics Monitored with the Global Human Settlement Layer
Megacities Spatiotemporal Dynamics Monitored with the Global Human Settlement Layer Open
Megacities are urban agglomerations hosting at least 10 million inhabitants. The rise in number, population size, and spatial extent of megacities are among the most prominent manifestations of the process of urbanisation taking place in t…
View article: Analysing spatiotemporal patterns of tourism in Europe at high-resolution with conventional and big data sources
Analysing spatiotemporal patterns of tourism in Europe at high-resolution with conventional and big data sources Open
Available statistics on tourism from official European sources are limited in terms of both the spatial and temporal resolutions, curbing potential analyses and applications relevant for tourism management and policy. In this study, we pro…
View article: Increasing the detail of land use/cover data for Europe by combining heterogeneous data sets
Increasing the detail of land use/cover data for Europe by combining heterogeneous data sets Open
Data on land use and land cover (LULC) are a vital input for policy-relevant research, such as modelling of the human population, socioeconomic activities, transportation, environment, and their interactions. In Europe, CORINE Land Cover h…
View article: Spatiotemporal mapping of population in Europe: The ENACT project in a nutshell
Spatiotemporal mapping of population in Europe: The ENACT project in a nutshell Open
Current knowledge of spatial distribution of population is still nowadays very incomplete. It is based upon place-of-residence statistics and does not account for the fact that people shift between various locations in daily, weekly and an…