Ground Truth
Every city is sinking. We measure how fast — and what it means for your house, your roads, and your future.
Consumer-facing land subsidence intelligence — satellite-measured ground displacement data, city-by-city risk rankings, infrastructure damage analysis, and property value impact, translated from raw InSAR science into beautiful maps, scorecards, and weekly dispatches.
Niche Explored
Consumer-facing land subsidence intelligence — tracking which cities are sinking, how fast, why, and what it means for infrastructure, property values, and insurance. Translating satellite InSAR data and government monitoring into beautiful, digestible content for homeowners, real estate investors, urban planners, journalists, and curious citizens.
Why This Niche
The Moment
- May 2025, Nature Cities: Columbia/UCI/Virginia Tech published landmark study showing ALL 28 biggest US cities are sinking, primarily from groundwater pumping. Massive media coverage.
- Nov 2025, World Economic Forum: Published “Resilient Economies: Strategies for Sinking Cities and Flood Risks” report with Deloitte.
- 2025, Tinbergen Institute: Published “Sinking Land, Sinking Prices?” — first major study linking subsidence to property values.
- Visual Capitalist ran “U.S. Cities at Risk of Sinking” infographic in Feb 2026 — went viral on Lemmy, Reddit, social media.
- BBC News published deep investigative feature on cities sinking at “worrying speed.”
- Nature 2025: China’s cities also sinking — 45% of Chinese urban areas subsiding.
- The topic is at a PERFECT inflection point: serious scientific attention, public awareness growing, but NO dedicated consumer-facing tracker exists.
Market Size
- 2.9 TRILLION euros in European climate risk to homeowners (Insurance Journal, 2025)
- US subsidence damage: billions annually (infrastructure repair, foundation damage, pipe breaks)
- 143 major coastal cities globally affected (Frontiers in Earth Science database, 2024)
- Property value impacts documented: San Joaquin Valley study shows measurable housing price drops
- Insurance industry scrambling to model subsidence risk
The Gap
- Academic papers are dense and paywalled
- Government monitoring data exists but is raw, technical, scattered
- NO consumer-facing site that tracks subsidence city-by-city with beautiful visualizations
- The BBC article, Visual Capitalist infographic, and Peter Frankopan’s Substack all went viral — proving massive audience demand
- Real estate investors, homeowners, and journalists are hungry for this data
Existing Competition
Direct competitors (almost none)
- Peter Frankopan’s Substack — wrote one post “The Cities Sinking Beneath Us” (May 2025). One-off, not automated, not data-rich
- Korrai.com — “Sinking Symphony” article, one-off think piece
- Visual Capitalist — one infographic, not a dedicated channel
- UNESCO Land Subsidence Initiative — academic newsletter (PDF!), quarterly, dense
Adjacent competitors
- First Street Foundation — climate risk financial modeling, but enterprise-focused ($$$), not consumer content
- Climate Central — sea level rise focus, not subsidence specifically
- Emapsite LandPack — UK insurance product, not content
Gap analysis
Nobody is doing: weekly city-by-city subsidence tracking + beautiful maps + consumer-friendly explainers + property impact analysis + global coverage. This niche is WIDE OPEN.
Data Sources Found
1. European Ground Motion Service (EGMS) — Copernicus
- URL: https://egms.land.copernicus.eu/ and https://land.copernicus.eu/en/products/european-ground-motion-service
- API: CLMS API (https://land.copernicus.eu/en/how-to-guides/how-to-download-spatial-data/how-to-download-data-using-clms-api)
- Toolkit: EGMS-toolkit Python scripts (published Springer 2024)
- Data: Millimeter-precision ground motion for ALL of Europe, derived from Sentinel-1 SAR
- Format: GeoJSON, CSV, downloadable datasets
- Cost: FREE, open data
- Update frequency: Annual baseline update, continuous processing
2. InSAR Norway API
- URL: https://insar.ngu.no/api-docs/
- API: REST API with bounding box queries for full-resolution InSAR data
- Data: Ground displacement time series for Norway
- Cost: FREE
- Format: JSON/CSV via API
3. COMET-LiCS Sentinel-1 InSAR Portal
- URL: https://comet.nerc.ac.uk/comet-lics-portal
- Subsidence portal: https://comet-subsidencedb.org/
- Data: 99 subsiding regions (Iran focus), InSAR time series
- Cost: FREE, research data
- Format: Web portal + Google Earth KML
4. NASA ARIA (Advanced Rapid Imaging and Analysis)
- URL: https://aria.jpl.nasa.gov/products/
- Products: Standard Displacement Products, GUNW interferograms
- Access: Via NASA Earthdata (https://www.earthdata.nasa.gov/data/catalog/asf-aria-s1-gunw-1)
- Tools: ARIA-tools Python package (GitHub: aria-tools/ARIA-tools)
- Cost: FREE with NASA Earthdata account
- Data: Global InSAR displacement maps from Sentinel-1
5. USGS Water Data APIs
- URL: https://waterdata.usgs.gov/ and https://api.waterdata.usgs.gov/docs/ogcapi
- Data: Groundwater levels from thousands of monitoring wells (subsidence is directly tied to groundwater extraction)
- API: OGC API standard, well-documented
- Cost: FREE
- Update: Real-time and historical
6. Frontiers Coastal Cities Database
- Paper: “Comprehensive database of land subsidence in 143 major coastal cities” (Frontiers in Earth Science, 2024)
- Data: Subsidence rates, causes, and risk levels for 143 cities
- Availability: Open access supplementary materials
7. OpenStreetMap + USGS Earthquake Hazards
- Infrastructure mapping overlay
- Building footprints for damage estimates
8. Copernicus Sentinel-1C
- New satellite launched, first InSAR dataset released Feb 2025
- Improved temporal resolution for ground motion monitoring
SEO Analysis
- “sinking cities” — high search interest, major media coverage in 2025, growing
- “land subsidence [city name]” — low competition, specific long-tail keywords
- “is [city] sinking” — conversational search queries with high intent
- “subsidence risk map” — commercial intent (real estate, insurance)
- “foundation damage subsidence” — homeowner pain point
- “groundwater depletion” — educational, growing concern
- Keyword gaps: No dedicated site ranks for city-specific subsidence tracking. BBC, Nature, and news sites have one-off articles but no ongoing tracker
Communities
- r/urbanplanning — 500K+ members, subsidence posts get engagement
- r/geology — interested in InSAR and ground motion data
- r/RealEstate — property value impact angle
- r/dataisbeautiful — visualization-heavy posts go viral
- r/collapse — infrastructure decay angle
- Lemmy earth science communities — Visual Capitalist subsidence infographic went viral here
- Urban planning Twitter/X — active discussion
- Climate tech newsletters — would pick up a dedicated subsidence tracker
Image/Graphic Feasibility
- Maps: EXCELLENT — InSAR data naturally produces beautiful displacement heatmaps (reds = sinking fast, blues = stable). Can generate with Python + matplotlib/folium/mapbox
- Charts: Time series of sinking rates per city — very visual
- Infographics: “How fast is your city sinking?” comparison graphics
- Before/after: Satellite imagery comparisons
- Cross-sections: AI-generated geological cross-sections showing why subsidence happens
- Risk scorecards: Per-city risk dashboards
- This is one of the MOST visual data niches possible — the maps practically make themselves
Sources
- https://www.nature.com/articles/s44284-025-00240-y (Nature Cities, May 2025)
- https://www.bbc.com/news/resources/idt-14d00552-9211-4dab-89d1-60e34e226e43 (BBC)
- https://datainnovation.org/2025/05/visualizing-sinking-cities/ (Center for Data Innovation)
- https://egms.land.copernicus.eu/ (EGMS)
- https://insar.ngu.no/api-docs/ (InSAR Norway)
- https://aria.jpl.nasa.gov/products/ (NASA ARIA)
- https://waterdata.usgs.gov/ (USGS Water)
- https://comet-subsidencedb.org/ (COMET Portal)
- https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2024.1351581/full (143 cities database)
- https://reports.weforum.org/docs/WEF_Resilient_Economies_Strategies_for_Sinking_Cities_and_Flood_Risks_2025.pdf (WEF)
- https://ideas.repec.org/p/tin/wpaper/20250040.html (Property values study)
- https://www.sciencedaily.com/releases/2025/05/250508112609.htm (All US cities sinking)