Fathom Global Flood Map and Global Flood Cat

Fathom is a water risk intelligence company founded in 2013 and headquartered in Bristol, UK, operating as SSBN Limited and acquired by Swiss Re in December 2023 while keeping its brand. It serves insurers, engineering firms, financial institutions, corporates, the public sector and international development organisations that need consistent, scientifically robust flood hazard data anywhere in the world.

The Global Flood Map provides fluvial, pluvial and coastal flood depths for return periods from 5 to 1,000 years at about 30 m resolution globally, downscaled to 10 m where regional data allows, with defended and undefended views, Risk Scores and metadata on data certainty. Climate Dynamics conditions the hazard on any future year and climate scenario up to 2100. Global Flood Cat is a catastrophe model covering all major flood perils to quantify financial losses, and FathomDEM+ supplies global terrain data. Data is delivered via API, portal, direct files or platform partners.

• Global Flood Map: Fluvial, pluvial and coastal flood depths at about 30 m resolution worldwide.
• Climate Dynamics: Flood hazard for any future year and climate scenario up to 2100.
• Global Flood Cat: Catastrophe model covering all major flood perils with damage uncertainty.
• Risk Scores: Relative risk and risk category for each flood type at any location.
• FathomDEM+: Global terrain data built with a hybrid vision transformer model.
• Flexible access: API, portal, GeoTIFF files and integrations with partner platforms.

• A Vietnamese non-life insurer prices property flood cover using return-period depths and catastrophe model losses.
• An engineering consultancy assesses flood exposure along a planned expressway or industrial zone under 2050 scenarios.
• A bank integrates flood risk scores for mortgage collateral through an API into its credit systems.

• One consistent flood methodology worldwide, so multinational portfolios can be compared across countries including those without detailed national maps.
• Covers river, surface water and coastal flooding, with future scenarios to 2100 for disclosure and planning.
• Catastrophe model outputs translate hazard into financial loss for underwriting and capital decisions.
• Modular licensing by planet, region or polygon, delivered through API or partner platforms.

Flooding is among the most frequent natural hazards in Southeast Asia, and insurers, banks and engineers increasingly need flood data that is consistent across countries and forward-looking under climate change. In Vietnam, where official flood maps vary in coverage, global flood models and terrain data help price insurance, assess collateral and plan infrastructure; Fathom's site lists a study using its terrain data to assess flood risk in Vietnam's Central Highlands.

Founded in 2013; HQ at Clifton Heights, Bristol, UK; legal entity SSBN Limited trading as Fathom. Acquired by Swiss Re in December 2023 and works with its Reinsurance Solutions division while keeping the Fathom brand. Data is integrated into ICE's Global Climate Risk Solution (May 2025) and Climate X's Spectra and Adapt (October 2025). Case studies include the World Bank, GFDRR, Bank of England, AXA, Arup and The Nature Conservancy.