The Areas Likely Flooded by Sea Level Rise dataset shows on a global scale which areas can be flooded at different amounts of water rise due to sea level rise, tide, and storm surge. The map presents sea level rise at 30-Meter, 20-Meter, 10 Meter, 5 Meter, 3-Meter, 2.5 Meter, 2-Meter, 1.5-Meter, 1.0- Meter, 0.5-Meter options. Areas that are inundated at each sea level rise value are masked in blue. The data used for surface elevation was collected from multiple sources that range from satellite imagery to flood maps between 1929 and 2015. The resolution of the dataset varies based on region in the world, with the contiguous United states being the highest resolution at 5 m and much of the rest of the world at 90 m.
This dataset was created by Climate Central under their project Surging Seas. It has been cited in over 5,000 articles, highlighted on the front page of the White House Climate Initiative website, and accessed by more than 60 federal agencies. It plays an important role in helping world governments understand the effects of climate change, make policies, and develop tools to effectively help communities in the instance of flooding.
The dataset was created by first combining multiple digital elevation models to create global coverage. Elevation data was then altered to be expressed relative to local high tide lines. High tide lines used were the average high tide line based on seasonal and monthly fluctuations (Mean Higher High Water). Next, two layers showing standard ocean water coverage and flood control methods for the United States were applied. Lastly, an algorithm was added to show how water coverage would increase based on different amounts of sea level rise, storm surge, and tides. The “bathtub method” algorithm shows water coverage in all areas below a given water height threshold that is input by the user. The final data was projected using raster and tabular data between 60 degrees north and 56 degrees south.
Elevation data for the contiguous United States came from National Oceanic and Atmospheric Administration’s (NOAA) Coastal Lidar collection at 5 m horizontal resolution and information on Alaska came from the United States Geological Survey (USGS) at 60 m resolution. Elevation data for Antigua and Barbuda, Barbados, Corn Island (Nicaragua), Dominica, Dominican Republic, Grenada, Guyana, Haiti, Jamaica, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, San Blas (Panama), Suriname, The Bahamas, and Trinidad and Tobago came from Climate Central’s CoastalDEM database at 10 m resolution. Data for the rest of the world was taken from NASA’s Shuttle Radar Topography Missions (SRTM) at a resolution of 90 m. High tide data was taken from the VDatum tidal model for the contiguous United States and a global tidal model supplied by Mark Merrifield of the University of Hawaii for the rest of the world.
For the full documentation, please click on the “Learn more” button.
Areas Likely Flooded by Increasing Water Levels 0.5 Meter, 1 Meter, 1.5 Meter, 2 Meter, 2.5 Meter, 3 Meter : Current land area that will likely be flooded at different amounts of sea level rise, storm surge, and tides.
Excerpts of this description page were taken from the source metadata. Resource Watch shows only a subset of the dataset. For access to the full dataset and additional information, click on the “Learn more” button.
Projections of SLR linked to Climate Scenarios
Climate Central, Surging Seas, sealevel.climatecentral.org 2018. Accessed through Resource Watch, (date). www.resourcewatch.org.
Contiguous US + Hawaii: almost entirely 5m or better horizontal resolution. ⅓ arcsec resolution (~10m) in areas where NOAA Coastal lidar is not available Alaska: Approximately 60-meter
NOAA Coastal Lidar: SRTM: 2000 VDatum: 2012 Merrifield MHHW: 2015