NOAA Office for Coastal Management Sea Level Rise Data: Coastal Flood Threshold Inundation Extent

These data were created as part of the National Oceanic and Atmospheric Administration Office for Coastal Management's efforts to create an online mapping viewer depicting potential sea level rise and its associated impacts on the nation's coastal areas. The purpose of the mapping viewer is to provide coastal managers and scientists with a preliminary look at sea level rise (slr) and coastal flooding impacts. The viewer is a screening-level tool that uses nationally consistent data sets and analyses. Data and maps provided can be used at several scales to help gauge trends and prioritize actions for different scenarios. The Sea Level Rise and Coastal Flooding Impacts Viewer may be accessed at: These data depict the potential inundation extent of coastal areas resulting from National Weather Service issued Coastal Flood Advisories. The Coastal Flood Advisory areas are based on individual Weather Forecast Office (WFO) guidance thresholds at monitored tide stations and are referenced to the MLLW tidal datum. The process used to produce the data can be described as a modified bathtub approach that attempts to account for both local/regional tidal variability. The process uses either two or three source datasets depending on geographic location to derive the final inundation rasters: the Digital Elevation Model (DEM) of the area, a tidal surface model that represents spatial tidal variability, and an interpolated threshold surface if there is significant difference between flooding thresholds between varying geographic areas (Ex: Chesapeake Bay area). The tidal model is created using the NOAA National Geodetic Survey's VDATUM datum transformation software ( in conjunction with spatial interpolation/extrapolation methods and represents the MLLW tidal datum in orthometric values (North American Vertical Datum of 1988).The interpolated threshold surface is created using the flooding threshold values found at select NOAA tide gages used by the NWS to define flooding events. The methods used to produce these data does not account for erosion, subsidence, or any future changes in an area's hydrodynamics. It is simply a method to derive data in order to visualize the potential scale and extent, not exact location, of inundation from NWS issued Coastal Flood Advisories.

Data and Resources

Additional Info

Field Value
Last Updated November 2, 2017, 21:52
Created November 2, 2017, 21:52
access_constraints ["Use Constraints: These data illustrate the scale of potential flooding, not the exact location, and do not account for erosion, subsidence, or future construction. Inundation is shown as it may appear during Coastal Flood Advisory conditions. These data should be used only as a screening-level tool for management decisions. As with all remotely sensed data, all features should be verified with a site visit. The dataset is provided \"as is,\" without warranty to its performance, merchantable state, or fitness for any particular purpose. The entire risk associated with the results and performance of this dataset is assumed by the user. This dataset should be used strictly as a planning reference and not for navigation, permitting, or other legal purposes.", "Access Constraints: None"]
bbox-east-long -65.097
bbox-north-lat 49.276
bbox-south-lat 17.750
bbox-west-long -160.740
coupled-resource []
dataset-reference-date [{"type": "publication", "value": "2012-01-01"}]
frequency-of-update notPlanned
licence ["\nAny conclusions drawn from the analysis of this information are not the responsibility of the Office for Coastal Management\nor its partners.\n"]
metadata-date 2017-11-01
progress completed
resource-type dataset
responsible-party [{"name": "NOAA Office for Coastal Management", "roles": ["pointOfContact"]}]
spatial {"type": "Polygon", "coordinates": [[[-160.74, 17.75], [-65.097, 17.75], [-65.097, 49.276], [-160.74, 49.276], [-160.74, 17.75]]]}
spatial_harvester true
temporal-extent-begin 2012-01-01
temporal-extent-end 2016-01-01