Vulnerability SR-4

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2 layers drawn: INFORM Vulnerability · Admin boundaries

Vulnerability maps

INFORM Vulnerability dimension A INFORM Lack-of-Coping-Capacity dimension A

Vulnerability (composite) — Atsinanana B

Open analysis workspace ↓

Base & context

Administrative boundaries (ADM0–ADM4)

Filter

Legend & panel

Layers on map (2)

INFORM Vulnerability dimension

Low

Elevated

High

Opacity 100%

×

Admin boundaries

ADM1–ADM3 — reference layer, no severity

Opacity 60%

×

Selected area — Analamanga

Dimension	Indicator	Rating
Physical	Substandard housing share	Elevated
Physical	Flood-plain settlement density	High
Socio-economic	Poverty rate	Elevated
Socio-economic	Access to early warning info.	Moderate
Environmental	Deforestation / watershed degr.	Moderate

Vulnerability is a standing characteristic of the area, not a live hazard reading — reviewed periodically, not per alert.

Dimension	Method	Sourcing
Physical	SMCE	A
Socio-economic	Curve	A
Environmental	SMCE	B

What Matrix/Curve/SMCE mean → · Configure a method →

Only Vulnerability and Lack-of-Coping-Capacity travel into an event-time impact estimate — INFORM's hazard/exposure dimensions stay on the standing baseline. Methodology →

Sources

INFORM Subnational Risk Index vulnerability sub-indicators (2026-05-01) · National poverty survey (2024) · Environmental Ministry watershed report (2025).

Vulnerability analysis workspace

Compose a vulnerability layer from registered dimensions for the selected area (Filter, left), adjust inputs where the platform actually computes the dimension, then run and save. A saved layer appears immediately in the catalog above and on Risk Dashboard — no separate review step.

1. Select dimensions

Supplied (Mode A) dimensions are included as-is — the platform doesn't recompute someone else's index. Computed (Mode B) dimensions show their method inputs below, open by default, because the platform does compute them.

Physical — INFORM Vulnerability dimension SMCE A · Supplied

View INFORM weights (predefined, read-only)

Component	Linked layer	Weight
Socio-Economic Vulnerability index	L-19 · INFORM Vulnerability dimension	50%
Vulnerable Groups index	L-19 · INFORM Vulnerability dimension	50%

Set by INFORM's published methodology, not locally configurable — a Supplied (Mode A) dimension is included as INFORM computed it, never re-weighted here. Shown in the same table shape as an editable SMCE dimension so the two are easy to compare, even though these weights are fixed.

Physical — Flood-plain settlement density Curve B · Computed

Adjust curve for this run

Hazard

Asset / exposure layer

River depth (m)	Vulnerability (0–1)

Registered for Flood × Residential buildings specifically — a different hazard or asset would read a different curve, not this one with different numbers.

Live preview: expected loss = exposure × vulnerability at 3m depth

Buildings exposed (Analamanga) × vulnerability at 3m (edit the table row above) = 135,160 expected affected buildings

Current area's river depth (3m) → vulnerability 0.62 → High (matches Selected area, right).

Socio-economic — Poverty rate Curve A · Supplied Socio-economic — Access to early warning information Matrix B · Computed

Adjust matrix for this run

Row factor (linked layer)

Column factor (linked layer)

Row ↓ / Col →	Low	Medium	High
Low
Medium
High

Current area: Comms infra. Medium × Literacy Medium → Moderate. Adjusting here changes this run only — the registered matrix on AD-1 is unchanged.

Environmental — Deforestation / watershed degradation SMCE B · Computed

Adjust weights for this run

Indicator	Linked layer	Normalized (0–1)	Weight
Land-cover loss rate (5yr)		0.62	%
Slope instability index		0.40	%
Distance to watershed (inverse)		0.55	%

Total: 100% (must equal 100% to run)

Composite so far: 0.62×45% + 0.40×30% + 0.55×25% = 0.54. Recompute after editing weights above, then Run below.

Environmental — Coastal erosion exposure Not connected

No registered method yet (Mode C · Absent) — register one on AD-1 to include it here.

2. Run

Runs across the selected area (Filter, left).

Result

Area	Analamanga
Dimensions included	5 of 6 registered (Coastal erosion excluded — not connected)
Composite score	0.58
Rating	Elevated

No review step — saving makes it immediately selectable as a Vulnerability layer on Risk Dashboard.

Saved layers

Area	Composite	Saved
Atsinanana	High (0.71)	2026-08-10 · on Risk Dashboard

Saved layers are pinned snapshots, not a live recalculation on every visit — re-run and save again to update one after its inputs change.

Sources: INFORM Subnational Risk Index vulnerability sub-indicators (2026-05-01) · National poverty survey (2024) · Environmental Ministry watershed report (2025).