Short Citation:
Office for Coastal Management, 2021: NOAA Office for Coastal Management Sea Level Rise Data: Coastal Flood Threshold Inundation Extent, https://www.fisheries.noaa.gov/inport/item/48101.

Item Identification

Title: NOAA Office for Coastal Management Sea Level Rise Data: Coastal Flood Threshold Inundation Extent
Short Name: NOAA_OCM_Coastal_Flood_metadata
Status: Completed
Publication Date: 2012
Abstract:

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:

https://www.coast.noaa.gov/slr

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 (http://vdatum.noaa.gov) 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.

Purpose:

The purpose of these data is to show the potential inundation extent caused by NWS issued Coastal Flood Advisories.

Notes:

10958

Supplemental Information:

A detailed methodology for producing these data can be found via the following url:

https://coast.noaa.gov/data/digitalcoast/pdf/slr-flood-frequency-methods.pdf

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0000001

Longitude_Resolution: 0.0000001

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222101

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988

Altitude_Resolution: 0.001

Altitude_Distance_Units: meters

Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords Earth Science > Land Surface > Geomorphic Landforms/Processes > Coastal Processes > Flooding
Global Change Master Directory (GCMD) Science Keywords Earth Science > Land Surface > Geomorphic Landforms/Processes > Coastal Processes > Sea Level Changes
Global Change Master Directory (GCMD) Science Keywords Earth Science > Land Surface > Topography > Terrain Elevation > Digital Elevation/Terrain Model (Dem)
ISO 19115 Topic Category climatologyMeteorologyAtmosphere
None Bathymetry/Topography
None elevation
None environment
None flooding
None inundation
None oceans
None sea level rise
None Shoreline

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords Continent > North America > United States Of America
None United States

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of the Office for Coastal Management

or its partners.

Data Set Credit: Acknowledgment of the NOAA Office for Coastal Management as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected.

Support Roles

Data Steward

CC ID: 620440
Date Effective From: 2012
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 620442
Date Effective From: 2012
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 620443
Date Effective From: 2012
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 620441
Date Effective From: 2012
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Publication Date

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 620446
W° Bound: -160.74
E° Bound: -65.097
N° Bound: 49.276
S° Bound: 17.75

Extent Group 1 / Time Frame 1

CC ID: 620445
Time Frame Type: Range
Start: 2012
End: 2016

Access Information

Security Class: Unclassified
Data Access Procedure:

This data may be downloaded at: https://coast.noaa.gov/slr;

Data Access Constraints:

None

Data 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.

URLs

URL 1

CC ID: 620436
URL: https://www.coast.noaa.gov/slr
URL Type:
Online Resource

URL 2

CC ID: 620437
URL: https://coast.noaa.gov/digitalcoast/tools/slr
URL Type:
Online Resource

URL 3

CC ID: 620438
URL: https://coast.noaa.gov/slrdata
URL Type:
Online Resource

URL 4

CC ID: 620439
URL: https://www.coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 620462
Activity Date/Time: 2017-11-01
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 620461
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Data Quality

Completeness Report:

The Flood Frequency inundation extent areas currently shown in the NOAA CSC Sea Level Rise and Coastal Flooding Impacts Viewer.

The current status of areas of coverage for the tool can be accessed at: https://coast.noaa.gov/slr

Conceptual Consistency:

Standard methods for determining inundation were used. The vertical accuracy of these data is dependent on the source

elevation data and the error associated with vertical datum conversions within NOAA's VDatum software.

Lineage

Sources

NOAA OCM Digital Elevation Models

CC ID: 620432
Contact Name: NOAA Office for Coastal Management
Publish Date: 2016-01-01
Extent Type: Range
Extent Start Date/Time: 2012
Extent End Date/Time: 2016
Citation URL: https://www.coast.noaa.gov/slr
Source Contribution:

The digital elevation model (DEM) of an area serves as one of two source datasets used to derive inundation outputs. | Type of Source Media: online digital data

NOAA OCM VDATUM Tidal Surface Models

CC ID: 620433
Contact Name: NOAA Office for Coastal Management
Publish Date: 2016-01-01
Extent Type: Range
Extent Start Date/Time: 2012
Extent End Date/Time: 2016
Citation URL: http://vdatum.noaa.gov
Source Contribution:

The tidal conversion surface of an area serves as one of two source datasets used to create the inundation outputs and is derived from

NOAA National Geodetic Survey's VDATUM software.

| Type of Source Media: online digital data

Process Steps

Process Step 1

CC ID: 620434
Description:

The process to derive the inundation rasters is as follows:

1. A tidal surface is generated using NOAA VDATUM tool and various spatial interpolation/extrapolation routines, dependent upon the area

being mapped. The surface generated represents the spatial variability of offsets between MLLW, a tidal datum and NAVD88, an orthometric

datum.

2. Using the DEM and the tidal surface, raster calculations are made using ArcGIS Spatial Analyst Raster Calculation

tool to generate one 8-bit single value raster representing the extent of inundation.

3. If necessary, an additional flood threshold surface is created using spatial interpolation techniques to capture the variability between flooding

thresholds within large geographic locations. This interpolated threshold surface is then added to the MLLW VDatum tidal surface to create a total

water surface layer referenced to the MLL tidal datum. The total water surface would then be used with the DEM in calculating the final flood

threshold layer.

Process Date/Time: 2016-01-01 00:00:00
Source: NOAA OCM Digital Elevation Models

Catalog Details

Catalog Item ID: 48101
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 14:15+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2019-07-02 15:17+0000
Metadata Record Published: 2017-11-16
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2018-11-17