Short Citation:
Office for Coastal Management, 2021: NOAA Office for Coastal Management Sea Level Rise Data: Current Mean Higher High Water Inundation Extent, https://www.fisheries.noaa.gov/inport/item/48105.

Item Identification

Title: NOAA Office for Coastal Management Sea Level Rise Data: Current Mean Higher High Water Inundation Extent
Short Name: NOAA_OCM_SLR_0ft_metadata
Status: Completed
Publication Date: 2016
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 of coastal areas resulting from current Mean Higher High Water (MHHW) conditions. 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 as

well as hydrological connectivity. The process uses two source datasets to derive the final inundation rasters and polygons and accompanying

low-lying polygons: the Digital Elevation Model (DEM) of the area and a tidal surface model that represents spatial tidal variability. 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 MHHW tidal datum in orthometric values (North American Vertical Datum

of 1988).

The model 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, not exact location, of inundation from sea level rise.

Purpose:

The purpose of these data is to show potential inundation from current Mean Higher High Water (MHHW) for the area.

Notes:

10962

Supplemental Information:

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

https://coast.noaa.gov/data/digitalcoast/pdf/slr-inundation-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
ISO 19115 Topic Category elevation
ISO 19115 Topic Category environment
ISO 19115 Topic Category oceans
None Bathymetry/Topography
None flooding
None inundation
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: 620606
Date Effective From: 2016
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: 620608
Date Effective From: 2016
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: 620609
Date Effective From: 2016
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: 620607
Date Effective From: 2016
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: 620612
W° Bound: 144.5
E° Bound: -64.5
N° Bound: 49.276
S° Bound: -14.5

Extent Group 1 / Time Frame 1

CC ID: 620611
Time Frame Type: Discrete
Start: 2016

Access Information

Security Class: Unclassified
Data Access Procedure:

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

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 would appear during the highest high tides (excludes wind driven tides) with the sea level rise amount. 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: 620601
URL: https://www.coast.noaa.gov/slr
URL Type:
Online Resource

URL 2

CC ID: 620602
URL: https://coast.noaa.gov/digitalcoast/tools/slr
URL Type:
Online Resource

URL 3

CC ID: 620603
URL: https://coast.noaa.gov/slrdata
URL Type:
Online Resource

URL 5

CC ID: 620605
URL: https://www.coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 620628
Activity Date/Time: 2017-11-01
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 620627
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 MHHW layer cover 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://www.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: 620597
Contact Name: NOAA Office for Coastal Management
Publish Date: 2016-01-01
Extent Type: Discrete
Extent Start 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: 620598
Contact Name: NOAA Office for Coastal Management
Publish Date: 2016-01-01
Extent Type: Discrete
Extent Start 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: 620599
Description:

The process to derive the inundation rasters and polygons and low-lying area polygons 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 MHHW, 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 multiple rasters, one 32-bit floating point raster representing depth of inundation and one 8-bit single value raster

representing the extent of inundation.

3. The hydrologic connectivity of the single value raster is evaluated using an 8-sided neighborhood rule in ArcGIS using the RegionGroup tool.

The output raster from this process is then converted to a vector polygon feature class for further analysis. Using this 'base' feature class,

a new feature class is created representing hydrologically connected areas. The 'base' feature class is also used to create a feature class

representing unconnected 'low-lying' areas.

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

Catalog Details

Catalog Item ID: 48105
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