Population Distribution and Change

In response to requirements outlined in the 21st Century Integrated Digital Experience Act, NASA’s Earth Science Data Systems (ESDS) program launched the Web Unification Project to migrate all ESDS-funded web properties to earthdata.nasa.gov by the end of 2026. The NASA SEDAC migration to the Earthdata website begins in October 2024  With these changes, not only will the interface you use to access SEDAC datasets, services, and tools change, but the paths for finding information will also change.  To view the new website’s  navigation options and learn how to get support during this transition, view the recent webinar: “Web Unification: Optimizing Your Access to NASA Earth Science Data”. 

Please contact us for more information or questions.

Susana Adamo (left) is co-author of an award winning poster on "Aging Populations and Subsequent Tree Cover Expansion, an Investigation in 139 Low- and Middle-Income Countries", presented by Courtney Allen (right) (University of Washington) at the 2024 Meeting of the Population Association of America, held 17-20 April in Columbus, Ohio. The poster was one of five PAA Poster Winners of the session on Neighborhoods, Environment, Spatial Demography, and Data and Methods, which included 98 posters. Co-author Sara Curran (center) (University of Washington) is a former member of SEDAC's User Working Group. Other co-authors of the poster include: Jeff Vincent (Duke University), Kaichao Chang (Duke University, and University of Maryland), and Yi Wang (Duke University and ETH Zurich).

CIESIN Associate Director for Science Applications Dana Thomson has been awarded the American Association for Public Opinion Research (AAPOR) Warren J. Mitofsky Innovators Award for her manual "Designing and Implementing Gridded Population Surveys”.  The award recognizes accomplishments in the fields of public opinion and survey research.  Thomson’s manual provides a detailed overview and step-by-step tutorials to conduct gridded population household surveys.  The 139 page manual is available free from the first link below.

CIESIN is pleased to announce the arrival of Dr. Dana Thomson, a prominent public health and spatial data expert who has worked at the intersection of demography, public health, and geography for two decades. Dr. Thomson’s work is characterized by open data, user-centered design, equitable partnerships that address historical inequities, and co-design of meaningful information. She will manage the CIESIN Science Applications division, which advances interdisciplinary research and applications on human-environment interactions, bringing to bear state-of-the-art scientific data and knowledge on pressing sustainable development challenges.

Dr. Thomson helped to establish the Integrated Deprived Area Mapping System (IDEAMAPS) Network which brings together experts from traditionally-siloed “slum” mapping communities including community members, government officials, humanitarians, and data scientists. Several projects within the IDEAMAPS Network are building the infrastructure and processes necessary for “slum” residents and local experts to access the data they need in appropriate formats and validate modelled outputs (maps) in areas they are familiar with, and for modelers to access a validation data layer to improve future iterations of models.

Dana is also a pioneer in the field of gridded population sampling, developing innovative tools and sampling approaches to more accurately measure populations in data-scarce settings, especially vulnerable and mobile populations who are poorly captured by traditional data collection methods. She developed GridSample.org and other tools that help survey experts without Geographic Information System (GIS) skills to create sample frames from gridded population data, and recently published the go-to manual on Designing and Implementing Gridded Population Surveys.

Dana holds a BA in Geography from the George Washington University, an MSc in Global Public Health from the Harvard School of Public Health, and an MSc and PhD in Social Statistics from the University of Southampton (UK). Her research has evaluated the accuracy of gridded population estimates and feasibility of their use for fieldwork in lower- and middle-income countries, and includes several large-scale evaluations of health systems in Africa, Asia, and the Caribbean using geospatial and household survey data. She has also taught practitioners and applied researchers at Harvard University, the University of Rwanda, and the University of Southampton, and worked with AmeriCorps, the Brookings Institution, Johns Snow Inc., the Measure DHS Project, and the World Bank. She has published 48 peer-reviewed articles in journals such as Land Use Policy, PLoS One, Urban Science and the International Journal of Health Geography.

CIESIN-Columbia University

Several new data products have been released under CIESIN’s NASA-funded Socioeconomic Data and Applications Center (SEDAC). Foremost among them, the Global Gridded Relative Deprivation Index (GRDI) measures relative poverty and deprivation using subnational data on human development, infant mortality, and child dependency, as well as satellite-derived data on built-up areas, nighttime lights, and change in nighttime lights. It is the first product of its kind that covers the entire world at a 1 kilometer spatial resolution. Other new data sets from the NASA SEDAC include:

—Daily and Annual Air Quality Data Sets for the Contiguous U.S. support research in environmental epidemiology, environmental justice, and health equity by linking with ZIP Code-level demographic and medical data sets.

—Country Trends in Major Air Pollutants, a framework of public-health-focused air quality indicators that measures more than 200 countries' trends in exposure to particulate matter (PM2.5), ozone (O3), nitrogen oxides (NOx), sulfur dioxide (SO2), carbon monoxide (CO), and volatile organic compounds (VOCs). Developed by an interdisciplinary team from Yale University with NASA SEDAC.

—Urban and Land Backscatter Time Series. Based on satellite microwave backscatter, the data set traces trends in urban settlements from 1993 to 2020. Developed by a team led by Steve Frolking, University of New Hampshire.

—Twentieth Century Crop Statistics, a crop yield data set spanning the period 1900‒2017 provides national and subnational data on production, yield, and harvested area of maize and wheat for many of the world’s major bread baskets. Developed by W. Anderson and others.

—Water Security Monthly Grids. Monthly surpluses and deficits of freshwater, computed on a 0.25 degree grid for 1948‒2014. Developed with ISciences.

A Webinar hosted by NASA Earthdata on November 30 featured CIESIN deputy director Alex de Sherbinin and research scientist Susana Adamo presenting air quality data sets distributed by the NASA Socioeconomic Data and Applications Center (SEDAC). The Webinar covered global gridded and tabular country and city trend data for particulate matter and other pollutants, and grids focusing on the United States for particulate matter, ozone, and nitrogen-dioxide. The Webinar also demonstrated the use of these data products with a variety of SEDAC data sets—Gridded Population of the World (GPWv4), Social Vulnerability Grids, and the recently released Global Relative Deprivation Index—to study health impacts and environmental justice.

Source: Understanding Flood Vulnerability: A Case Study of Harris County (StoryMap)

Climate change disproportionately affects the poor and socially vulnerable. The scientific community is responding in its commitment to data and services development that can advance environmental justice. A recent NASA Earthdata Backgrounder profiles some of the work the NASA Socioeconomic Data and Application Center (SEDAC) is doing in this area.

The backgrounder describes a research project focused on the low-wealth, predominately Black community of the Hampton Roads region of Norfolk, VA, which is experiencing rising sea level rise in part because the land area is sinking. SEDAC population data was paired with satellite data to reveal high population density combined with anomalously high sea surface height in this area, identifying high vulnerability. Integrating different types of data in this way lets planners and policymakers make better-informed mitigation decisions that take into consideration social as well as physical impacts of sea-level rise, better insuring environmental justice for vulnerable communities.

In a second example, in collaboration with the International Research Institute for Climate and Society (IRI), SEDAC helped develop an index that assesses flood vulnerability for Harris County, Texas. Taking a multidisciplinary approach to capturing resilience and susceptibility to flooding, 15 indicators were combined into an aggregate index. The tool can visualize flood vulnerability at the block group level for Harris County and analyze relative flood vulnerability across the region, improving prioritization of flood remediation policies and aid.

CIESIN director Robert Chen, with associate director for Science Applications Alex de Sherbinin and research scientist Susana Adamo, helped organize and co-lead a NASA Equity and Environmental Justice virtual workshop, in their respective SEDAC roles as manager, deputy manager, and project scientist. The workshop report was released in December 2021.

Tuholske et al., PNAS, 2021 Annual municipality-level increases in the rate of urban population exposure to extreme heat, 1983–2016.

Rising air temperatures associated with climate change are a threat to cities throughout the world, but especially to the urban poor. The poor generally have fewer adaptive resources and less protective shelter; they have greater health vulnerability to extreme heat, and lower ability to evacuate. These conditions can be exacerbated by the urban heat island effect, where closely spaced structures with lots of pavement and limited green space, common to poorer neighborhoods worldwide, retain heat more readily and for a longer duration. Better understanding of patterns of local exposure to extreme heat is critically needed to design adaptive measures and improve health outcomes. However, until now, global, fine-resolution data on the intersection of extreme heat and population distribution in urban settings have been limited.

A new study published in the prestigious journal, Proceedings of the National Academy of Sciences (PNAS), “Global Urban Population Exposure to Extreme Heat,” is the first to combine temperature, relative humidity, and population data to provide a more detailed and comprehensive view of how extreme heat exposure is likely to impact many more people in cities around the world in the coming decades. Lead author is Earth Institute Fellow Cascade Tuholske, based at CIESIN, with co-authors Kelly Caylor, Chris Funk, Andrew Verdin, Stuart Sweeney, Kathryn Grace, Pete Peterson, and Tom Evans. The team used new, fine-resolution temperature, relative humidity, and population data to assess urban extreme heat exposure in more than thirteen thousand cities, from 1983 to 2016. Using a daily maximum wet bulb globe temperature threshold of 30°C (86°F)—which accounts for a combined impact of both temperature and humidity on human health and wellbeing—global exposure was seen to increase nearly 200% from 1983 to 2016. Total urban warming elevated the annual increase in exposure by approximately 50% compared to urban population growth alone. Exposure increased for nearly half of urban settlements worldwide, which in 2016 comprised 1.7 billion people.

The authors also found that how total urban warming and population growth drove the trajectory of exposures was not evenly distributed, thus reinforcing the importance of crafting adaptation measures that address local needs. Their findings further suggest that previous research has underestimated extreme heat exposure, underscoring the necessity for improved data to support the development of targeted adaptions such as early warning systems to reduce harmful effects, especially on the urban poor. Visualize the Data/Associated Press  

This summer has seen a spate of extreme climate-related events, from record high temperatures to forest fires, floods, and severe storms. Climate and other natural and manmade hazards do not affect all populations equally. Some sub-populations are particularly vulnerable to their effects owing to factors such as low income, lower levels of education, poor housing, or historical inequalities. Parsing out the fine-grained layers of social conditions across the strata of society—how much money people make, who makes up their households, minority status, ability to understand English, dwelling places, and access to transport—can provide the fundamental elements needed to quantify social vulnerability to hazards in the United States. The Centers for Disease Control (CDC) Social Vulnerability Index (SVI), created by the Geospatial Research, Analysis, and Services Program (GRASP) of the Centers for Disease Control and Prevention (CDC) and the Agency for Toxic Substances and Disease Registry (ATSDR), has long been a key resource for local officials to identify communities that may need support before, during, or after hazardous events or disease outbreaks.

To increase the utility of the SVI data set, the NASA Socioeconomic Data and Applications Center (SEDAC) operated by CIESIN gridded the input data and removed uninhabited areas. The resulting data set, the U.S. Social Vulnerability Index (SVI) Grids, enables calculation of the SVI for user-defined areas, facilitating integration with hazard and other geospatial data. The gridded SVI data set uses the same four themes as the CDC/ATSDR index—Socioeconomic, Household Composition and Disability, Minority Status and Language, and Housing Type and Transportation—to rank communities on vulnerability for the entire United States. The SVI data set is based on inputs at the census-tract level for 15 variables for the years 2000, 2010, 2014, 2016, and 2018, and aligns with the Gridded Population of the World (GPW) data set, SEDAC′s flagship data collection.

A map gallery includes an overall SVI map and four maps visualizing each of the themes. Development of the gridded data set and maps was led by Carolynne Hultquist, post-doctoral research scientist at CIESIN.

For the AmeriGEO Week2021 held virtually August 23‒27, Cascade Tuholske, Earth Institute postdoctoral research scientist, gave a pre-recorded presentation, “Urban Extreme Heat Exposure Trajectories in AmeriGEO Countries.” Staff from CIESIN, the International Research Institute (IRI), and Lehman College, and graduate students from Lehman, presented and authored four poster papers. The students are interns working with postdoctoral research scientist Carolynne Hultquist, supported by the NASA Socioeconomic Data and Applications Center (SEDAC) operated by the Center.

For the 2nd Knowledge Discovery and Data Mining (KDD) Workshop on Data-driven Humanitarian Mapping held virtually August 15, Lehman College student Lauren Carey gave a pre-recorded presentation on extracting street-level flood vulnerability data from Google Street View, based on a workshop paper co-authored with fellow students Raychell Velez, Christopher Aime, and Diana Calderon, together with staff from CIESIN, IRI, and Lehman College.

CIESIN associate director for Science Applications Alex de Sherbinin teamed up with Prof. Andrew Tatem of the University of Southampton in the virtual event, “Using Big Data to Study Migration Patterns,” organized by the Columbia Population Research Center (CPRC) and Columbia’s Data Science Institute (DSI) on April 22. The two researchers discussed the use of novel data streams such as cellphone and device location data to understand mobility patterns. Following the presentation, which drew more than 50 participants, a reception was held for CPRC and DSI affiliates to discuss research collaboration opportunities. Among other activities, de Sherbinin is co-lead of the Climate Mobility Network, a new “Earth Network” established by the Earth Institute. Tatem is the director of WorldPop and a director of Flowminder, and a key collaborator in the GeoReferenced Infrastructure and Demographic Data for Development (GRID3) program managed by CIESIN.

CIESIN through its NASA Socioeconomic Data and Applications Center (SEDAC) has released two new data sets, one characterizing historical air quality over the period 1998–2016, and the second projecting urban land extent into the future through 2100 under different shared Socioeconomic Pathways (SSPs). The first data set, “Annual PM2.5 Concentrations for Countries and Urban Areas, 1998–2016,” provides annual mean estimates of levels of particulate matter (particles with diameters of 2.5 microns or less) in the atmosphere, derived from observations from satellite-based sensors, for countries and urban areas. The national averages are population-weighted. This data set is based on a gridded data set developed by van Donkelaar et al., also available from SEDAC.

The data set “Global One-Eighth Degree Urban Land Extent Projection and Base Year Grids by SSP Scenarios, 2000–2100” was developed by Jing Gao of the University of Delaware and Brian O’Neill, now director of the Joint Global Change Research Institute at the University of Maryland. The data set characterizes global, spatially explicit urban land scenarios consistent with the SSPs, projected from the base year 2000 to the year 2100 at ten-year intervals, with a spatial resolution of one-eighth degree (7.5 arc-minutes). Such projections are key inputs for analyses of land use, energy use, and emissions and assessments of climate change vulnerability, impacts, and adaptation.

The NASA Socioeconomic Data and Applications Center (SEDAC) operated by CIESIN has released several new data sets related to hazards, infant mortality, and future socioeconomic scenarios. The Geocoded Disasters (GDIS) Dataset is a geocoded extension of a selection of natural disasters from the Centre for Research on the Epidemiology of Disaster (CRED) Emergency Events Database (EM-DAT). The data set includes nearly 40,000 locations for almost 10,000 disasters worldwide for the 58-year period spanning 1960–2018. It encompasses all EM-DAT-recorded floods, storms, earthquakes, landslides, droughts, volcanic activity and extreme temperatures, some at administrative level 3 (district/commune/village) but most at 1 (typically state/province/region). GDIS facilitates geospatial analysis of past hazard events.

The Shared Socioeconomic Pathways (SSPs) Literature Database consists of biographic information, abstracts, and analysis of 1,360 articles published 2014–2019 that make substantial use of the SSPs. The database was developed by Carole Green et al. as the basis for a recent article in Nature Climate Change that analyzes use of the Climate Change Scenario Framework and associated scenario data sets in diverse application areas and in assessments of the Intergovernmental Panel on Climate Change (IPCC). The International Committee on New Integrated Climate Change Assessment Scenarios (ICONICS) is planning to extend the literature database. SEDAC User Working Group member Brian O'Neill of the Joint Climate Change Research Institute and CIESIN director Robert Chen are members of ICONICS.

Global Subnational Infant Mortality Rates (IMR), Version 2.01, provides more recent and higher-resolution infant mortality data, including estimates of births and infant deaths. The estimates are for 234 countries and territories, 143 of which include subnational units and are benchmarked to the year 2015 (versus year 2000 for the first version). IMR data are drawn from national offices, Demographic and Health Surveys (DHS), Multiple Indicator Cluster Surveys (MICS), and other sources covering 2006–2014. The birth and infant death data can be aggregated or disaggregated to calculate IMRs at different scales or resolutions. Boundary inputs are derived primarily from the Gridded Population of the World, Version 4 (GPWv4) data collection. National and subnational data are mapped at a spatial resolution of 30 arc-seconds (~1 km at the equator), facilitating integration with demographic, environmental, and other spatial data. Data set development was led by senior geographic information specialist Dara Mendeloff and research scientist Susana Adamo.

The data set, Georeferenced U.S. County-Level Population Projections, Total and by Sex, Race and Age, Based on the SSPs, 2020–2100, contains county-level population projection scenarios of total population, and by age, sex, and race in five-year intervals for all US counties 2020–2100. These data can serve as inputs for addressing questions involving sub-national demographic change in the United States in the near, middle- and long-term. 

Two side events held in preparation for the United Nations Statistical Commission 52^nd Session included discussion of the use of georeferenced population data in supporting efforts to meet the Sustainable Development Goals (SDGs) at global, national, and subnational levels. On February 16, CIESIN director Robert Chen served as a panelist in the virtual event, “Working to Improve Timeliness and Granularity of SDG data: Progress Made in the Data for Now Initiative.” Organized by the Global Partnership for Sustainable Development Data (GPSDD) and the UN Sustainable Development Solutions Network (SDSN), the side event drew more than 190 participants from around the world. Chen highlighted progress made by the POPGRID Data Collaborative to improve access to timely, internationally comparable data on human population, settlements, and infrastructure by National Statistical Offices (NSOs) and other users.

On February 25, Prof. Forrest Stevens of the University of Louisville participated in the side event, “The SDGs Geospatial Roadmap,″ organized by the UN Working Group on Geospatial Information (WGGI). The event included a panel on the launch of the Earth Observation Toolkit for Sustainable Cities, organized by UN-Habitat and the Earth Observations for the Sustainable Development Goals (EO4SDG) initiative of the Group on Earth Observations (GEO). Stevens discussed contributions of the GEO Human Planet Initiative (HPI) to the new toolkit, which features a range of data, tools, and services developed by several HPI participants, such as the Joint Research Centre of the European Commission and a NASA-funded project led by CIESIN in collaboration with the University of Louisville and ImageCat, Inc.

Established in 1947, the United Nations Statistical Commission is the highest body of the global statistical system, bringing together the chief statisticians from member states from around the world. Its 52nd Session was held virtually March 1–5.

The Joint Research Centre (JRC) of the European Commission has released the 2020 edition of the Atlas of the Human Planet, focused on open geoinformation for research, policy, and action, under the auspices of the Human Planet Initiative of the Group on Earth Observations (GEO). This year′s Atlas features more than 30 applications of the georeferenced human settlement and population data in four thematic areas: disaster risk management, urbanization, development, and environment and sustainability. Two of the applications showcased were developed by CIESIN: the Global COVID-19 Viewer operated by the NASA Socioeconomic Data and Applications Center (SEDAC), in “Mapping the COVID-19 Pandemic and Potential Risk Factors,″ and a summary of an update to a 2007 data set available from SEDAC, in “New Estimates of Global Population and Land in the Low Elevation Coastal Zone Using GHSL-based Data Sets.″ The first showcase was prepared by CIESIN director Robert Chen, GIS programmer Kytt MacManus, and associate director for Science Applications Alex de Sherbinin. The second was authored by MacManus, former SEDAC project scientist Deborah Balk of Baruch College, staff associate Hasim Engin, UK demographer Gordon McGranahan, former research staff assistant Rya Inman, and intern Alexandra Hayes.

The JRC organized a virtual launch event January 21 that drew more than 90 participants. The event included 4 short presentations on selected applications, including the Global COVID-19 Viewer example, described by Chen. The Viewer, developed and enhanced in 2020, helps users visualize a range of data on COVID-19 cases and mortality in relationship to spatial data on demographic and environmental factors that may affect exposure and vulnerability, such as age structure, degree of urbanization, air quality, and elevation. Chen and Martino Pesaresi of the JRC are co-leaders of the GEO Human Planet Initiative.

CIESIN senior geographic information specialist Dara Mendeloff was an invited rapporteur for select sessions of the OGC Location Powers Urban Digital Twins virtual summit held January 12–14. The focus of the conference was how “digital twins” at the urban scale use location and geospatial technology to transform how cities are planned, built, and managed to better deliver services in order to create more livable, inclusive, safe, resilient and sustainable urban environments. Mendeloff represented both OGC members CIESIN and the NYC Geographic Information System and Mapping Organization (GISMO), where she is a member of the Board of Directors. In consideration of the international audience of the virtual summit, the OGC aimed to make presentations available in both east and west time zones and to build on each other, so she also presented her summary report of the 1W session to sessions 1E and 2W. Her report will be included in a final document that summarizes discussion on the status of Digital Twins and recommends future technology innovations, best practices, and standards development. The OGC is the Open Geospatial Consortium, an international organization committed to improving access to geospatial and location information, including the development of free, publicly available geospatial standards that enable new technologies.

On January 21, Mendeloff reprised her role as an instructor for the Earth Institute (EI) Live K–12 science education video series, when she offered a session aimed at grades 9–12, “Climate Data—The Numbers Behind the Numbers.” The 45-minute video, available on the EI Live channel, explains the data science tools used in climate research by scientists to understand geographic data, perform spatial analysis, and visualize data while communicating a story. 

Due to the ongoing pandemic, many international conferences have shifted to online, virtual platforms in 2020, opening up opportunities for CIESIN staff to interact remotely with new communities and showcase recent work and new resources. For example, associate director for Science Applications Alex de Sherbinin recently gave a remote keynote address, “Groundswell Model Results for South Asia,” November 25 at the International Conference on Building Resilient and Sustainable Societies, organized by Jamia Millia Islamia University in New Delhi. The address discussed ongoing work with the World Bank to model how climate impacts may induce migration out to 2050. He and research scientist Susana Adamo also participated in the virtual meeting of the Platform for Disaster Displacement’s Data and Knowledge Working Group November 24, where they gave the respective presentations, “Novel and Big Data Approaches to Identifying Disaster Displacement,” and “Migration, the COVID-19 Pandemic, and Climate in Central America’s Northern Triangle.”

During the International CODATA FAIR Convergence Symposium 2020 held virtually November 27–December 4, CIESIN director Robert Chen presented in a panel session, “Synergies between Citizen Science Data and the UN Sustainable Development Goal (SDG) Indicators,” organized by Dilek Fraisl of the International Institute for Applied Systems Analysis (IIASA) in Austria. Chen then led a breakout group within this session. Alex de Sherbinin also contributed to the session, “Citizen Science in Africa for the SDGs,” giving closing remarks. The Symposium was organized by the Committee on Data (CODATA) of the International Science Council and the GO FAIR initiative.

On December 1 Chen gave a short presentation, “Open Data Sharing Across the Disaster Lifecycle," in the community session, "A Call to Action for Resilience: Moving from Research to Practice,” held as part of the World Bank’s 2020 Understanding Risk Forum (UR2020) December 1–3. The session was organized by Charles Huyck of ImageCat, Inc. and Shanna McClain of NASA. Chen highlighted the importance of open data access and reuse throughout the disaster management lifecycle, not just in the immediate aftermath of an extreme event.

Professor Stefan Leyk of the University of Colorado organized and led a virtual workshop November 30, “Gridded Population Data for the Sustainable Development Goals,” for experts from Colombia's National Administrative Department of Statistics (DANE) and Paraguay's General Directorate of Statistics, Surveys, and Censuses (DGEEC). The workshop provided an overview of the development and sources of gridded population data, hands-on technical training in working with selected data, and a forum for obtaining feedback on user needs. CIESIN Director Robert Chen gave introductory remarks during the opening session, and in the final session research scientist Susana Adamo provided an update in Spanish on progress and plans for the fifth version of the Gridded Population of the World (GPW) data set. Associate director for Science Applications Alex de Sherbinin, associate director for Geospatial Applications Greg Yetman, and research staff assistant Juan Martinez also attended.

The workshop was organized by Leyk and Maryam Rabiee of the Thematic Research Network on Data and Statistics (TReNDS) of the United Nations Sustainable Development Solutions Network (SDSN), under the auspices of the POPGRID Data Collaborative. Funding for the workshop was provided by Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH. POPGRID is an initiative launched by CIESIN in 2017 to bring together both developers and users of global georeferenced population data in support of development applications. POPGRID activities and resources are supported in part by the Bill & Melinda Gates Foundation and the NASA Socioeconomic Data and Applications Center (SEDAC). Leyk is also a member of SEDAC′s User Working Group.

A major milestone for CIESIN′s main program, the  NASA Socioeconomic Data and Applications Center (SEDAC), has been reached: 100,000 registered users since implementing the registration system back in February 2015, or about 17,000 per year. Note that this includes only the users registering to download data; the SEDAC Web site receives more than 50,000 visitors a month. SEDAC users constitute about 10% of the registered users in the wider NASA Earthdata Login (EDL) system, which includes 11 of the other sister data centers (DAACs) in the NASA Earth Observing System Data and Information System (EOSDIS), and various other elements and components.

Users who participated in the annual American Customer Satisfaction Index survey gave SEDAC an overall positive evaluation again. The survey assesses user satisfaction with the data, tools, and support provided by the NASA EOSDIS data centers and services, of which SEDAC is the only one to focus on the integration of remote sensing and socioeconomic data.

CIESIN has developed a collaboration with the Department of Earth, Environmental, and Geospatial Sciences at Lehman College of the City University of New York to develop and enhance hazards data, working initially with five Lehman graduate and undergraduate students. Supervised by CIESIN alumnus Yuri Gorokhovich, associate professor in the Department, the students are Christopher Aime, Diana Calderón, Nira Rahman, and Raychell Velez from Lehman's Master′s program in Geographic Information Science; and Hadja Doumbouya, a senior majoring in environmental sciences. CIESIN associate director for Geospatial Applications Greg Yetman is assisting the students in using machine learning methods to develop improved data on the exposure and vulnerability of buildings and other infrastructure to hazards, extending recent work for the State of New York supported by the New York State Energy Research and Development Authority (NYSERDA). Carolynne Hultquist, CIESIN postdoctoral research scientist, and Andrew Kruczkiewicz, senior staff associate at the International Research Institute for Climate and Society (IRI), are also working with the students to apply the data to flash flood hazard assessment.

The collaboration is supported by the NASA Socioeconomic Data and Applications Center (SEDAC) as part of SEDAC's efforts to achieve small business purchasing goals established by NASA, which include collaboration with Minority Serving Institutions (MSIs) and Historically Black Colleges and Universities (HBCUs). Outputs of the collaboration will be made available via SEDAC after appropriate review. Based in the Bronx, Lehman is one of the only MSIs (or HBCU′s) in the US to offer a master of science degree in geographic information science.