Licenses & sources

This project's own licenses

Code (Eleventy templates, JavaScript, CSS, build config): GNU General Public License v3.0; full text in LICENSE.

Written content (page copy, tool comparisons, the About page history) and the County Profiles figures (the compiled and derived statistics on the county profiles and in each county's snapshot JSON, which states the license in its own license field): CC BY 4.0. Share and adapt freely, including commercially, as long as you give credit. The source data the figures are computed from keeps its own terms, listed below.

Neither license covers the third-party material below. Why each source is or isn't on the map is recorded in docs/LICENSING.md on GitHub.

Flood & hazard data

Loaded live from each publisher's own server. Nothing here is stored or modified by this project.

• BCDC Adapting to Rising Tides — Bay Shoreline Flood Explorer
  License: CC BY-SA 4.0  ·  Credit: Caltrans; BCDC Adapting to Rising Tides
  Served via the Caltrans open data portal. Planning-level only. Displaying it as a live layer is fine; a redistributed copy of the dataset itself must stay share-alike. BCDC's disclaimer. About this tool.
• BCDC East Contra Costa Shoreline Flood Explorer
  License: CC BY-SA 4.0  ·  Credit: Caltrans; BCDC Adapting to Rising Tides
  Same program, WMS server and terms as the Bay explorer. Planning-level only. BCDC's disclaimer. About this tool.
• Cal-Adapt Sea Level Rise – Coastal Inundation Scenarios
  License: No separate license stated by the tool
  Flood-extent tiles for two models, mosaicked and served by Cal-Adapt (UC Berkeley Geospatial Innovation Facility). The CoSMoS component is USGS (public domain). Please cite the studies below. About this tool.
  • Barnard, P.L., Erikson, L.H., Foxgrover, A.C., Finzi Hart, J.A., Limber, P., O'Neill, A.C., van Ormondt, M., Vitousek, S., Wood, N., Hayden, M.K., & Jones, J.M. (2019). Dynamic flood modeling essential to assess the coastal impacts of climate change. Scientific Reports, 9, Article 4309. https://doi.org/10.1038/s41598-019-40742-z
  • Radke, J., et al. (2018). Assessing extreme weather-related vulnerability and identifying resilience options for California's interdependent transportation fuel sector. California's Fourth Climate Change Assessment, California Energy Commission, CCCA4-CEC-2018-012. https://www.energy.ca.gov/sites/default/files/2019-11/Energy_CCCA4-CEC-2018-012_ADA.pdf
• FEMA National Flood Hazard Layer
  License: U.S. public domain
  Effective data only; preliminary maps are not shown. FEMA asks for acknowledgement. About this tool.
• Interagency Sea Level Rise Technical Report scenarios
  License: CC BY 4.0  ·  Credit: Interagency Sea Level Rise Task Force, 2022 Technical Report data (Zenodo, CC BY 4.0)
  Tide-gauge sea level projections from the Interagency Sea Level Rise Task Force (NOAA, NASA, EPA, USGS, USACE, FEMA, DoD), read live from the task force's Zenodo record (version 1.1). Values can differ from NASA's Interagency Sea Level Rise Scenario Tool. About this tool.
  • Sweet, W.V., Hamlington, B.D., Kopp, R.E., Weaver, C.P., Barnard, P.L., et al. (2022). Global and Regional Sea Level Rise Scenarios for the United States: Updated Mean Projections and Extreme Water Level Probabilities Along U.S. Coastlines. NOAA Technical Report NOS 01. https://oceanservice.noaa.gov/hazards/sealevelrise/sealevelrise-tech-report.html
• NOAA Coastal Flood Exposure Mapper
  License: U.S. public domain
  Hazard-overlap composite, High Tide Flooding, FEMA Flood Zones and Tsunami Run-up overlays. About this tool.
• NOAA High Tide Flooding stations
  License: U.S. public domain
  NOAA CO-OPS tide-gauge flood thresholds, from the Sea Level Rise Viewer's point-layer service. About this tool.
• NOAA Sea Level Rise Viewer
  License: U.S. public domain
  The sea-level-rise scenario overlay. About this tool.
• NOAA/NWS/NHC National Storm Surge Risk Maps
  License: U.S. public domain
  Hurricane storm surge overlay (Category 1–2, Southern California only). About this tool.
• USGS CoSMoS / Our Coast, Our Future
  License: U.S. public domain
  Served through Point Blue Conservation Science's tile/WMS infrastructure (geo.pointblue.org), which asks for a courtesy citation. About this tool.

Geo / demographic context layers

Non-flood layers you can overlay on the flood data, each loaded from the agency that publishes it.

• State of California Sea Level Rise Guidance: 2024 Science & Policy Update (California Ocean Protection Council), Appendix 2
  License:
  Median sea level rise projections for 14 tide gauges, hand-transcribed into the repository (site/_data/opcGaugeProjections.json) and used to compute the County Profiles timing table. The numbers are facts, not the guidance's text, and it states no license; cite the guidance.
• Caltrans traffic volumes (AADT)
  License: CC BY 4.0  ·  Credit: Caltrans
• Caltrans truck volumes (AADT)
  License: CC BY 4.0  ·  Credit: Caltrans
• CDC/ATSDR Social Vulnerability Index
  License: U.S. public domain
  Poverty and age 65+ (tract).
• EPA Facility Registry Service
  License: U.S. public domain
  Regulated facilities.
• EPA Smart Location Database
  License: U.S. public domain
  Population and jobs density (block group).
• NOAA C-CAP land cover and Wetland Potential
  License: U.S. public domain
  The map: served through NOAA's Coastal Flood Exposure Mapper services. County Profiles: the 1996 and 2021 regional 30 m land cover rasters, read by window and intersected with the hazard extents (build time only).
• NOAA Coastal County Snapshots (section text)
  License: U.S. public domain
  The explanatory prose of each County Profiles section is NOAA's own, reused with the adaptations listed in docs/COUNTY-PROFILES.md. NOAA's figures are not used. About this tool.
• NOAA Economics: National Ocean Watch (ENOW)
  License: U.S. public domain
  County Profiles: the self-employed workers series (county, through 2021) and the 2021 county figures the estimates are checked against, read through NOAA's Quick Report data API. The marine economy figures themselves are built from public QCEW (see the entries below).
• NOAA Total Economy (Coastal)
  License: U.S. public domain
  County Profiles: the coastal California and coastal U.S. comparison values on the total economy wages chart (2023, its newest year), and the series the county totals are checked against, read through NOAA's Quick Report data API.
• NOAA Open ENOW
  License: U.S. public domain
  County Profiles: the method (sector and NAICS definitions, the imputation ladder, the GDP approach) that the county marine economy estimates follow, and the California and All Coastal States (the coastal portions of 30 states) values on the marine wages chart, read through NOAA's data API.
• U.S. Bureau of Labor Statistics — Quarterly Census of Employment and Wages
  License: U.S. public domain
  County Profiles: annual average establishments, employment and wages by county, NAICS code and ownership, from the public annual by-area files. The basis of the marine and total economy figures.
• U.S. Bureau of Economic Analysis — GDP by state and industry
  License: U.S. public domain
  County Profiles: California GDP by industry (table SAGDP2, current dollars), used with QCEW wages to estimate sector GDP.
• U.S. Census Bureau — ZIP Code Business Patterns and TIGER shoreline geography
  License: U.S. public domain
  County Profiles: establishments by ZIP code, industry and size class (ZIP Code Business Patterns), and the 2020 ZIP code tabulation areas, coastline and tidal water areas (TIGER), used to estimate the share of tourism and recreation in shoreline-adjacent ZIP codes.
• U.S. Census Bureau TIGERweb (State and County boundaries)
  License: U.S. public domain
  County lines and the outline used by "Highlight county", queried live. Census Bureau data are in the public domain.
• USGS National Structures Dataset
  License: U.S. public domain
  Critical facilities: hospitals, fire/EMS, police, schools.
• U.S. Census Bureau — American Community Survey (5-year)
  License: U.S. public domain
  County Profiles: population, residents aged 65 and over and residents below the poverty line, by block group, from the bulk summary files.
• U.S. Census Bureau — 2020 tabulation blocks (TIGER/TIGERweb)
  License: U.S. public domain
  County Profiles: block boundaries, internal points, 2020 populations and land areas, the block-level geography every hazard intersect is made at.
• U.S. Census Bureau — LEHD LODES
  License: U.S. public domain
  County Profiles: jobs by workplace block (LODES8 workplace area characteristics, all jobs).
• U.S. Census Bureau — Nonemployer Statistics
  License: U.S. public domain
  County Profiles: self-employed workers by sector for the total economy (nonemployer establishments by 2-digit NAICS, county file).
• FEMA OpenFEMA — NFIP claims
  License: U.S. public domain
  County Profiles: National Flood Insurance Program claims and payouts by five-year period.

Basemaps & address search

• Esri World Imagery
  License: Esri terms of use; Visualization only  ·  Credit: Imagery © Esri, Maxar, Earthstar Geographics, and the GIS User Community
  Optional Satellite basemap.
• Humanitarian OpenStreetMap Team style, hosted by OpenStreetMap France
  License: ODbL 1.0; Data is OSM; the host asks for light use only  ·  Credit: © OpenStreetMap contributors, tiles style by Humanitarian OpenStreetMap Team, hosted by OpenStreetMap France
  Optional Humanitarian basemap. OpenStreetMap France.
• OpenFreeMap and OpenMapTiles
  License: MIT, CC BY 4.0  ·  Credit: OpenFreeMap © OpenMapTiles, data from OpenStreetMap
  Free, keyless hosting of the default greyscale (Positron) vector basemap. OpenMapTiles.
• OpenStreetMap
  License: ODbL 1.0  ·  Credit: © OpenStreetMap contributors
  Data behind every basemap.
• OpenStreetMap Nominatim
  License: ODbL 1.0, Nominatim usage policy
  Address search and geocoding. Search runs on submit only, never per keystroke, per the usage policy.

Libraries & fonts

Loaded from public CDNs at pinned versions with Subresource Integrity hashes, not bundled into this repository (except Eleventy, d3-array and d3-scale, which only run at build time).

• d3-array
  License: ISC
  Sums for the County Profiles charts (build time only).
• d3-scale
  License: ISC
  Scale maths for the County Profiles share rings (build time only).
• Eleventy
  License: MIT
  Static site generator (build time only).
• esri-leaflet
  License: Apache-2.0
  ArcGIS REST client for the NOAA and FEMA layers.
• geotiff
  License: MIT
  Reads windows of the C-CAP land cover GeoTIFFs for County Profiles (build time only).
• h5wasm
  License: NIST software notice  ·  Credit: h5wasm, National Institute of Standards and Technology (NIST)
  Reads the sea level projection file (HDF5) in the browser, from the National Institute of Standards and Technology (NIST); loaded lazily.
• Leaflet
  License: BSD-2-Clause
  Map library.
• leaflet.heat
  License: BSD-2-Clause
  Draws the critical-facilities density overview (bundles the simpleheat canvas library, same license). Version 0.2.0.
• leaflet.locatecontrol
  License: MIT
  The "show my location" button.
• MapLibre GL JS
  License: BSD-3-Clause
  Renders the vector basemap; loaded lazily.
• maplibre-gl-leaflet
  License: ISC
  Leaflet adapter for MapLibre.
• Spectral and IBM Plex Sans
  License: SIL OFL 1.1
  Page fonts, via Google Fonts. The County Profiles preview cards use copies of Spectral SemiBold and IBM Plex Sans Regular and SemiBold bundled in the repository (scripts/county-profiles/og/fonts/, with their license files).
• Material Symbols
  License: Apache-2.0
  County Profiles' Diverse Economies chart: one small icon per economic sector, pulled from the @material-symbols/svg-400 package at build time.
• polygon-clipping
  License: MIT
  Polygon intersection and union for County Profiles land-in-floodplain areas (build time only).
• resvg-js
  License: MPL 2.0
  Turns the County Profiles preview cards from SVG into PNG (build time only).
• Satori
  License: MPL 2.0
  Lays out the County Profiles preview cards as SVG (build time only).
• undici
  License: MIT
  HTTP client for the County Profiles pipeline downloads, for its configurable connect timeout (runs in the pipeline only, never in the browser). Version 8.11.2.

Credits listed here are also shown on the map's own attribution strip. Sources with no credit line are public domain and are listed for transparency.