Hawaiʻi Sea Level Rise Viewer

Posted on: 11/19/2018 - Updated on: 2/27/2020

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The Hawaiʻi Sea Level Rise Viewer (Viewer) is intended to provide an online atlas to support the Hawaiʻi Sea Level Rise Vulnerability and Adaptation Report (Report) that was mandated by Act 83, Session Laws of Hawaiʻi (SLH) 2014 and Act 32, SLH 2017. Please visit the Hawaiʻi Climate Adaptation Portal website to view the full report and for more information on climate mitigation and adaptation.

The Viewer is intended to provide map data depicting projections for future hazard exposure and assessing economic and other vulnerabilities due to rising sea levels. Users may view and download map data for:

  • Coastal hazard exposure areas with sea level rise including passive flooding (still water high tide flooding), annual high wave flooding (over wash during the largest wave events of the year), and coastal erosion.
  • An aggregate of the above hazard layers into a combined Sea Level Rise Exposure Area (SLR-XA). It should be noted that for the islands of Lānaʻi, Molokaʻi, and Hawaiʻi, the SLR-XA represents only the passive flooding hazard due to the lack of historical data needed to model the other two hazards.
  • Vulnerability assessment layers, including potential economic impacts to land and structures and threats to coastal highways from sea level rise and coastal hazards.
  • Other base maps and overlays.

The Report was developed by Tetra Tech, Inc. and the State of Hawaiʻi Department of Land and Natural Resources (DLNR), Office of Conservation and Coastal Lands (OCCL). The Viewer was developed by the Pacific Islands Ocean Observing System (PacIOOS) at the University of Hawaiʻi School of Ocean and Earth Science and Technology (UH SOEST) through a collaborative project led by the University of Hawaiʻi Sea Grant College Program (Hawaiʻi Sea Grant) in partnership with DLNR and the State of Hawaiʻi Office of Planning. Coastal hazard exposure map data were developed for the Report and Viewer by the Coastal Geology Group at UH SOEST and adapted for display and vulnerability assessment by Tetra Tech, Inc. The SLR-XA and vulnerability assessment layers were developed for the Report and Viewer by Tetra Tech, Inc. Funding for the Viewer development was provided by the National Oceanic and Atmospheric Administration (NOAA) through their 2016 Regional Coastal Resilience Grants Program and the DLNR through Act 83, SLH (2014).


The Pacific Islands Ocean Observing System (PacIOOS) believes that ocean data and information can help save lives and resources. Aiming to promote a safe, healthy and productive ocean and resilient coastal zone, PacIOOS collects real-time data on ocean conditions, forecasts future events, and develops user-friendly tools to access this information. In collaboration with a large network of partners, PacIOOS helps inform decision-making in Pacific communities on a daily basis.

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