G04 · PROCESS · cycleGCRI dossier · service level R0
GCRIHealth NexusEstablished
How work moves in this field

How work moves in this field

The Nexus cycle in Health Nexus: question, evidence, build, organize, test, publish, decide and renew, with the page and owner of each step.

Publisher
The Global Centre for Risk and Innovation
Field
Health and biosecurity
Status
Established
Service level
R0: information and enquiries

Exercise control

Surge capacity review · Day 3 of 5 · Controlled · observed

  • Injects delivered
    10of 18Active
  • Median response
    44minWatch
  • Observer notes
    29
  • Stand-down
    Day 5plannedNormal
Injects runningGCRI · Health Nexus

Inject timeline

  1. 09:00INJ-1Scenario opens: Surge capacity review
  2. 10:30INJ-2Referral hospital receives first signal
  3. 12:15INJ-3Escalation: second system affected
  4. 14:00INJ-4Media query and public message
  5. 16:30HOTHot wash, observers first

Player cells

National IHR focal point552Responding
Public health institute328Active
District health office219Responding
Referral hospital424Responding

Health Nexus · Exercise controlExercise control, in outline: domain structure with placeholder names and illustrative values, not a record.

01In brief

The short answer.

The Nexus cycle in Health Nexus is the eight-step path by which a question in the health and biosecurity field becomes evidence, a Foundry build, an organized community, a controlled test, a publication and a decision taken by the competent authority. Here the evidence step rests on epidemiology and public health science as well as molecular and life sciences, and findings feed Global Sector Risk and Resilience.

02Canvas

Scoping to review.

Canvas · scoping to reviewDesign, not a record
How work moves in this field: an exercise from design to lessonsObjectives and a scenario are designed with the owner; injects are scripted; players respond in cells while controllers and observers watch; a hot wash and an after-action report turn observations into owned improvements. Design of the process, not a record of a run.

Fig.A programme from scoping to the owner's decision. Design, not a record.

03Geography

People and exposure in Africa.

For how work moves in this field, in GCRI's spatial-intelligence reading, the map opens on population density, true-colour imagery and daytime surface heat, framed on Africa; 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 how work moves in this field, in GCRI's spatial-intelligence reading, the map opens on population density, true-colour imagery and daytime surface heat, framed on Africa; 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 · Copernicus Sentinel-2 L2ASources 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
  • MODIS and VIIRS atmosphere products, NASA LANCE and LAADS DAAC; imagery 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.
  • Observed (EO): Copernicus Sentinel-2 L2A (contains modified Copernicus Sentinel data 2026), Microsoft Planetary Computer
  • 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 surface temperature, day, 8-day composite: VIIRS NOAA-20 Level 3, 8-day, NASA LANCE · 14 Sep 2026
  • Flood water, 3-day composite: VIIRS Global Flood Product, NASA LANCE · 14 Oct 2026
  • Land cover type (IGBP), yearly: MODIS Terra and Aqua land cover (MCD12Q1), NASA LP DAAC · 2024
  • Aerosol optical depth, daily: VIIRS NOAA-20 Deep Blue AOD, NASA LANCE · 13 Oct 2026

04The cycle

Eight steps, each with an owner.

  1. QuestionNational, regional or institutional priorityQuestion in Health Nexus
  2. EvidenceSTEM foundation of the platformEvidence in Health Nexus
  3. BuildNexus FoundryBuild in Health Nexus
  4. OrganizeNexus EcosystemOrganize in Health Nexus
  5. TestNexus Universe (independent site)Test in Health Nexus
  6. PublishNexus ReportsPublish in Health Nexus
  7. DecideCompetent authorities and institutions, through Nexus RailsDecide in Health Nexus
  8. RenewCorrections and the next annual agendaRenew in Health Nexus
05The cycle here

How the Nexus cycle runs for health.

A Health Nexus cycle often starts with a ministry's preparedness question, draws on surveillance, facility and supply data, builds capacity and supply models, tests them in a hospital continuity exercise and returns options to the health authority.

06Owners

Who is responsible at each step.

StepOwner
QuestionNational, regional or institutional priority
EvidenceSTEM foundation of the platform
BuildNexus Foundry
OrganizeNexus Ecosystem: community, chapters, councils, national cells
TestNexus Universe (independent site)
PublishNexus Reports
DecideCompetent authorities and institutions, through Nexus Rails
RenewCorrections and the next annual agenda
07Key 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
Nexus cycleThe eight-step loop by which work moves in every Nexus field: question, evidence, build, organize, test, publish, decide and renew, each step with a named owner.
Competent authorityThe body that a law or regulation designates to exercise a given power or duty, such as a supervisor, a civil protection agency or a ministry; only it can take the decisions the law assigns to it.
Peer reviewEvaluation of a work by independent experts in the field before publication.
International Health RegulationsThe legally binding WHO instrument that sets countries' duties to detect, assess, report and respond to public health events of international concern.
08Sources

Where this page's references lead.

The bodies and documents this page is read against. Status and editions change; each link goes to the issuing body.

09Questions

Questions and answers.

Who takes the decision at the end?
The competent authority or institution, under its own rules. The cycle supplies evidence and options; it does not decide.
Health Nexus

Bring your expertise to this field.

The current service level is R0: information and enquiries. An enquiry receives a reference and names the next step; applications, payments, compute allocations and registrations open only when their team, terms and review capacity exist.

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