The Global Centre for Risk and Innovation (GCRI)
In cities, hazards strike people unequally. Low-income residents, renters, migrants, older people, people with disabilities and those in informal settlements often face more exposure and have fewer resources to cope and recover. This page sets out how social vulnerability arises in cities, how it is measured and mapped, and what evidence serves the city governments and agencies that plan for it.
GCRI · In development · service level R0
Urban social vulnerability is the greater susceptibility of some city residents to harm from hazards, arising from where they live, the resources they have and whether institutions see them. Exposure follows affordability, coping capacity differs, some groups are invisible to registers and recovery can widen gaps.
For urban social vulnerability, in GCRI's spatial-intelligence reading, the map opens on population density, true-colour imagery and night lights, framed on Latin America and the Caribbean; every other NASA layer, live feed and forecast waits in the layer list.
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NASA GIBS / EOSDIS · ASTER GDEM (METI, NASA) · Blue Marble (NASA) · © OpenStreetMap contributors (ODbL) · Natural Earth
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For urban social vulnerability, in GCRI's spatial-intelligence reading, the map opens on population density, true-colour imagery and night lights, 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.
Layers and dates
The working screen behind this subject: its structure, terms and states. Names are placeholders and values illustrative.
Community resilience and informal services. The dossier below sets out how the risk develops, what is measured, where the data come from, how it is modelled and who decides.
Cheaper housing is often in flood zones, near industry or in hotter neighbourhoods, so low-income residents face more hazard.
Savings, insurance, social networks, mobility and language skills shape how people prepare for and recover from shocks.
Undocumented migrants, homeless people and informal workers may be missed by registers and warnings and avoid official help.
Owners with insurance rebuild while renters are displaced, so recovery can deepen inequality in a city.
Each term as this page uses it. Where a standard-setting body defines the term, the wording follows that body.
| Term | Definition |
|---|---|
| Coping capacity | The ability of people and organizations to manage adverse conditions using available resources. |
| Social vulnerability index | A composite measure combining social variables to compare vulnerability between areas. |
| Tenure insecurity | Lack of protection against eviction from one's home or land. |
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.
| Indicator | Unit | Cadence | Source type | Label |
|---|---|---|---|---|
| Population in hazard zones by income group | people | per assessment | Census and hazard overlays | ESTIMATED |
| Households without insurance | percent of households | per survey | Household surveys | REPORTED |
| Older people living alone | count | per census | Census | OFFICIAL |
| Renters as share of households | percent | per census | Census | OFFICIAL |
| Language barriers to warnings | percent of residents with limited official language | per census | Census | OFFICIAL |
| Homelessness | people counted by a stated definition | per count | Administrative counts | REPORTED |
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.
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.
Named public datasets and institutional records, each with its licence class. Sources by agreement are used only under their terms and never republished.
| Source | What it gives | Licence class |
|---|---|---|
| National censuses and small-area statistics | Population characteristics by neighbourhood | Licence per statistics office |
| CDC/ATSDR Social Vulnerability Index documentation | A published method for combining census variables, for method reference | Public domain, US government |
| Household surveys with urban samples | Assets, insurance and coping | Licence per survey |
| Local hazard maps | Flood, heat and other hazard zones | Licence per authority |
| UN-Habitat urban data | Urban inequality and housing indicators | Public, UN-Habitat terms (to check) |
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 decides | The question | Evidence this page serves |
|---|---|---|
| City governments | Where to target preparedness, outreach and recovery support | Vulnerability maps; equity reviews |
| Emergency managers | How to reach groups missed by standard warnings | Outreach gap analyses |
| Housing authorities | How to protect renters and low-income residents in recovery | Recovery equity evidence |
Informal settlements often occupy land left undeveloped because it is hazardous: floodplains, steep slopes, coastal margins or land near industrial sites. Dense housing with little green space intensifies urban heat, and poor drainage turns rain into flooding. Insecure tenure discourages households from investing in safer housing and can exclude them from formal recovery support.
Informal providers, such as water vendors, informal transport and savings groups, fill service gaps and can be flexible in crises, but they may also raise prices or fail when supply chains break. Community networks and organizations are central to everyday resilience, sharing information, resources and labour. Evictions and relocation after disasters can destroy these networks and livelihoods.
Urban heat illustrates how these factors combine. Dense, poorly ventilated housing, lack of shade and green space, outdoor work, unreliable power and limited access to cooling or health care mean that the same heatwave can be far more dangerous in an informal neighbourhood than in a planned district nearby.
Participatory and imagery-based mapping of settlements and services; official maps often omit informal areas.
Household and community surveys of exposure, services and tenure.
Spatial indices combine indicators; results depend on weighting choices.
Limits: informal areas are under-counted in censuses, vulnerability indices can hide the specific drivers that matter locally, and publishing detailed maps of settlements can expose residents to eviction.
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.