G-P16 · TOPIC · media-and-information-systemGCRI dossier · service level R0
GCRISociety and Human DevelopmentIn development
Topic dossier · Society and Human Development

Media and information systems

In a crisis, what people know depends on news media, social platforms, messaging apps, official channels and word of mouth. These systems can save lives by spreading accurate warnings and guidance, or spread rumours and false information that cost them. This page sets out how information systems work in crises and over time, how information quality and access are measured, and what evidence serves the authorities, media and civil society involved.

01In brief

The short answer.

Crisis information is what people learn about a crisis through news media, platforms, messaging apps, official channels and word of mouth. Shrinking local news, fast-spreading private messages and amplification of engaging content shape it, and people act most on information from messengers they trust.

02Geography

People and exposure in Latin America and the Caribbean.

For media and information systems, in GCRI's spatial-intelligence reading, the map opens on population density, true-colour imagery and land cover with true colour from NASA GIBS, framed on Latin America and the Caribbean; every other NASA layer, live feed and forecast waits in the layer list.

The interactive map needs JavaScript; the layer list and sources are below.

Layers 3

People and exposure, for this page

Latest available

NASA GIBS / EOSDIS · ASTER GDEM (METI, NASA) · Blue Marble (NASA) · © OpenStreetMap contributors (ODbL) · Natural Earth

Loading the latest NASA imagery.

Drag to move. Ctrl or ⌘ and scroll, pinch or the buttons to zoom; hover for the values under the pointer; reset returns to the region.

For media and information systems, in GCRI's spatial-intelligence reading, the map opens on population density, true-colour imagery and land cover with true colour from NASA GIBS, framed on Latin America and the Caribbean; every other NASA layer, live feed and forecast waits in the layer list.Satellite and model products as NASA publishes them, each with its own date; indicators, not assessments of any place; claim ceiling INTEGRATED.

Data: NASA GIBS · ASTER GDEM · Blue Marble · © OpenStreetMap contributors · Natural Earth · GDACS · Copernicus Sentinel-2 L2A · NASA HLS S30Sources and licences

  • We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Science Data and Information System (ESDIS). Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Science Data and Information System (ESDIS). Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • Center for International Earth Science Information Network (CIESIN), Columbia University. 2018. Gridded Population of the World, Version 4 (GPWv4): Population Density, Revision 11. NASA Socioeconomic Data and Applications Center (SEDAC). Licensed under CC BY 4.0. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). CC BY 4.0
  • VIIRS near-real-time products (flood, land surface temperature, snow cover, corrected reflectance), NASA LANCE; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • MODIS land products (vegetation indices, gross primary production, land cover), NASA LP DAAC and LANCE; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • VIIRS Black Marble night-time lights, NASA Goddard Space Flight Center; distributed by the NASA Level-1 and Atmosphere Archive and Distribution System (LAADS DAAC); imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • NASA Fire Information for Resource Management System (FIRMS), VIIRS 375 m active fire product, NASA LANCE; vector tiles via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • ASTER GDEM is a product of METI and NASA (ASTER Global Digital Elevation Model V003, NASA LP DAAC); imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • Made with Natural Earth. Free vector and raster map data @ naturalearthdata.com. Public domain
  • © OpenStreetMap contributors (ODbL), via NASA GIBS (coastlines, boundaries, roads and place names). Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). ODbL
  • Blue Marble, NASA Earth Observatory; imagery via NASA GIBS. Colours redrawn from the published colour map; values averaged into H3 cells where shown (modified). NASA open data
  • Context on the globe and flat map: coastlines, boundaries, roads and place names from NASA GIBS reference layers (OpenStreetMap data, ODbL, © OpenStreetMap contributors); Blue Marble imagery as an optional base; 3D terrain and the elevation read-out from the ASTER GDEM elevation colour index (5 m to 200 m classes, exaggerated for legibility). Boundaries are drawn as published and imply no position on any territory.
  • Globe: MapLibre GL JS 6.9.1, BSD-3-Clause, © MapLibre contributors.
  • Live: GDACS (EC JRC / UN OCHA) Events are indicative, not official warnings.
  • Observed (EO): Copernicus Sentinel-2 L2A (contains modified Copernicus Sentinel data 2026), Microsoft Planetary Computer
  • Observed (EO): NASA HLS S30 (contains modified Copernicus Sentinel data 2026). We acknowledge the use of imagery provided by services from NASA's Global Imagery Browse Services (GIBS), part of NASA's Earth Science Data and Information System (ESDIS).
  • Optional layers (35 sources in the layer list: live, forecast, observed and context) print their provider credit on the map and here when switched on; forecasts are model output and derived indices are estimates.

Layers and dates

  • Population density, 2020: Population: CIESIN, Columbia University, Gridded Population of the World v4.11 (2018), NASA SEDAC, CC BY 4.0 · static
  • True colour: VIIRS NOAA-20 corrected reflectance, NASA LANCE · 13 Oct 2026
  • Land cover type (IGBP), yearly: MODIS Terra and Aqua land cover (MCD12Q1), NASA LP DAAC · 2024
  • Flood water, 3-day composite: VIIRS Global Flood Product, NASA LANCE · 14 Oct 2026
  • Night-time lights, daily: VIIRS Black Marble (VNP46A2), NASA LAADS DAAC · 12 Oct 2026
  • Active fires and thermal anomalies, last day: VIIRS NOAA-20 375 m (FIRMS), NASA LANCE FIRMS · 13 Oct 2026

03Console

Social protection and cohesion, in outline.

The working screen behind this subject: its structure, terms and states. Names are placeholders and values illustrative.

Social protection and cohesion

Media and information systems · Urban ward 9 · Year 2

Survey wave closedGCRI · Society and Human Development

Coverage by quintile

050100share of households receiving supportQ1Q2Q3Q4Q5

Cohesion survey

Trust in neighbours6351▲ 2
Trust in local authority4852▲ 1
Reported discrimination911▲ 2
Social protection and cohesion: the screen's structure, terms and states for Media and information systems.Placeholder names and illustrative values; a design, not a record or a live system.
04The question

Media and information systems: how the risk develops.

Media and public information as social systems. The dossier below sets out how the risk develops, what is measured, where the data come from, how it is modelled and who decides.

Mechanism

Local news is shrinking

Loss of local journalism leaves communities with fewer trusted sources and less scrutiny of local institutions.

Mechanism

Messaging apps carry crisis information

Private messaging groups spread information quickly, including rumours, and are hard for authorities to monitor or correct.

Mechanism

Platforms amplify what engages

Recommendation systems favour content that draws attention, which can amplify fear, outrage and false claims in a crisis.

Mechanism

Trusted messengers matter

People act on information from sources they trust, such as community leaders, health workers and local media, more than on distant authorities.

05Key terms

Terms used on this page.

Each term as this page uses it. Where a standard-setting body defines the term, the wording follows that body.

TermDefinition
Risk communicationThe exchange of information and advice between experts, authorities and people facing a risk.
InfodemicAn overabundance of information, including false information, during a health emergency.
Trusted messengerA person or source whose information people believe and act on.
06Indicators

What is measured, and how well.

Each indicator carries its unit, its cadence, the kind of source behind it and the evidence label a value would carry. No values are shown: a programme supplies them under its own authority.

IndicatorUnitCadenceSource typeLabel
Trust in newspercent trusting most news most of the timeannualNews consumption surveysREPORTED
Main source of news by typepercent of respondentsannualNews consumption surveysREPORTED
Journalists killed or imprisonedcountannualPress freedom monitorsREPORTED
Local news outletscount per regionper assessmentMedia mapping studiesESTIMATED
Rumours tracked in crisis responsecount by themeper eventCommunity feedback systemsREPORTED
Population reached by official crisis messagespercentper eventPost-event surveysREPORTED
07Canvas

From sources to decisions.

The topic as a computational graph: named sources feed the methods, an evidence review gates the outputs, and the decisions stay with the authorities that hold them.

Pipeline canvas · Media and information systems as a run graphDesign, not a record
Media and information systems: responding to harmful informationPublic narratives are monitored; items are detected and their provenance verified; harm is assessed against a threshold; the response (correct, prebunk, label, escalate) is chosen and reported transparently. Design of the process, not a record of a run.

Fig. 02Nodes carry their type, two metric rows and a state; connectors show what feeds what; dashed frames name the owners; the timeline is the cadence. Design of the pipeline, not a record of a run.

08Sources

Where the evidence comes from.

Named public datasets and institutional records, each with its licence class. Sources by agreement are used only under their terms and never republished.

SourceWhat it givesLicence class
Reuters Institute Digital News ReportNews use and trust across countriesPublic report, terms per publisher
UNESCO Observatory of Killed Journalists and World Trends in Freedom of ExpressionSafety of journalists and media freedomPublic, UNESCO terms
Committee to Protect Journalists dataJournalists killed and imprisonedPublic, terms to check
WHO infodemic management resourcesMethods for managing information in health emergenciesPublic, WHO terms of use
IFRC and partner community feedback and rumour tracking guidanceMethods for listening to communities in crisesPublic, IFRC terms (to check)
09Decisions

Who decides, and what the evidence serves.

Society and Human Development prepares evidence. The decisions below are taken by the authorities named, under their own rules, and never by the platform.

Who decidesThe questionEvidence this page serves
Public health and emergency authoritiesHow to reach people with accurate information in crisesEcosystem assessments; trust profiles
Media organizations and regulatorsHow to support local journalism and information qualityMedia mapping and freedom evidence
Humanitarian agenciesHow to listen to and respond to community concernsRumour tracking evidence

Outputs this topic produces

  • Information ecosystem assessments for crisis communication
  • Rumour tracking and community feedback methods
  • Media access and trust profiles
  • Evidence notes for risk communication
10Core questions

The questions experts ask.

  • How is the information ecosystem structured, and who controls its key channels?
  • What happens to public knowledge when local news declines?
  • How do information flows behave during crises, and where do they break?
  • Which communities are poorly served by mainstream channels?
  • How do economic models of media affect the quality of risk information?
11Mechanisms

The ecosystem and its fragilities.

Information ecosystems combine professional media, platforms, messaging apps, community channels and official sources. The decline of local journalism in many places has reduced coverage of local government, hazards and public health. Platforms have become major gatekeepers, and their ranking and moderation choices shape exposure to information. Encrypted messaging networks carry both community support and rumour, and are hard to observe.

During crises, demand for information surges while normal channels may fail through power and network outages. Rumours fill gaps when official information is slow or distrusted. Language, literacy, disability and connectivity determine who receives timely information. Concentration of ownership and dependence on advertising revenue influence what is covered and how.

Resilient information systems share some features: diverse sources, trusted local intermediaries, channels that work without the internet such as radio, information in the languages people speak, and official communicators who are open about uncertainty and correct themselves quickly. These features can be studied, compared and strengthened.

Public service and community media often play an outsized role in crises because they reach people without internet access and are locally trusted. Their funding and independence are therefore part of a society's risk infrastructure, a point the field documents with comparative evidence across countries.

12Methods and data

Methods and limits.

Mapping

Ecosystem mapping

Mapping outlets, audiences and flows of information in a place.

Content

Content analysis

Systematic analysis of coverage and narratives; large-scale methods need careful validation.

Audience

Audience research

Surveys and qualitative work on how people find and judge information.

Limits: platform data access is restricted, private messaging is largely unobservable, and rapidly changing technology dates findings quickly.

13Methods

How it is studied, and what the methods cannot say.

  1. Social and behavioural scienceSurvey design for hard-to-reach groups · Qualitative and participatory researchApplied here
  2. Causal inference and impact evaluationEvaluating cash transfers · Effects of disasters on households · Education programme evaluationApplied here
  3. Spatial statistics and geostatisticsSmall-area poverty estimation · Vulnerability and hazard overlayApplied here
14Questions

Questions and answers.

What is an infodemic?
An overabundance of information, including false or misleading information, during a health emergency, in WHO usage.
Why does local journalism matter in a crisis?
Because local outlets provide specific, trusted information about what is happening nearby and hold local institutions to account.
What is rumour tracking?
Systematically collecting and analysing rumours and questions from communities so responders can address concerns and correct false information.
Does the platform rate media outlets?
No. It studies information systems and their effects on public outcomes.
How is this different from the chapter?
The chapter organizes a community of researchers around the subject; this topic page sets out the science.
Is GCRI a media regulator?
No. GCRI does not regulate, certify, license or approve.
Society and Human Development

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