Slide Menu
Search Help Show/Hide Menu
Short Citation:
Office for Coastal Management, 2024: NOAA Office for Coastal Management Marsh Migration,

Item Identification

Title: NOAA Office for Coastal Management Marsh Migration
Short Name: Marsh Migration
Status: Completed
Publication Date: 2023

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 called the Sea Level Rise and Coastal Flooding Impacts Viewer. It depicts 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 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:

This metadata record describes the Marsh Migration data displayed in the SLR Viewer. These data represent the potential distribution of each wetland type based on their elevation and how frequently they may be inundated under potential future SLR scenarios, from 0 to 10ft of SLR. As sea level rises, higher elevations will become more frequently inundated, allowing for marsh migration landward. At the same time, some lower-lying areas will be so often inundated that the marshes will no longer be able to thrive, becoming lost to open water. These data are based on the assumption that specific wetland types exist within an established tidal elevation range, based on an accepted understanding of what types of vegetation can exist given varying frequency and time of inundation, as well as salinity impacts from such inundation.

The data were created using the NOAA OCM Coastal Change Analysis Program (CCAP) land cover data, the SLR Viewer's digital elevation models, and NOAA VDatum tidal surfaces.

The data are available in 0.5ft increments of net sea level change, from 0 to 10ft. To determine the appropriate level, the user must identify a SLR scenario and an applicable accretion rate for the area of interest. The easiest way to do this is to go into the SLR Viewer's Marsh Migration tab; select a location, SLR scenario, and timeframe; and identify the closest available 0.5ft increment to what the viewer shows. For more information, see the tutorial at

Data are available for download at


The NOAA Office for Coastal Management has developed marsh migration data for use in the Office's Sea Level Rise Viewer. These data depict potential distribution of marsh types based on potential future water levels due to sea level rise.

Supplemental Information:

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

Attributes for this product are as follows: 0 Background, 2 High Intensity Developed, 3 Medium Intensity Developed, 4 Low Intensity Developed, 5 Developed Open Space, 8 All Uplands, 13 Palustrine Forested Wetland, 14 Palustrine Scrub/Shrub Wetland, 15 Palustrine Emergent Wetland, 17 Brackish/Transition Wetland, 18 Estuarine Wetland, 19 Unconsolidated Shore, 21 Open Water.

These data are projected in the applicable NAD83 UTM zone and have a resolution of 10m.


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
ISO 19115 Topic Category
ISO 19115 Topic Category
ISO 19115 Topic Category
None Bathymetry/Topography
None Coastal Change Analysis Program
None Elevation
None Land Cover Analysis
None Marsh Migration
None Net Sea Level Change
None Sea Level Rise

Spatial Keywords

Thesaurus Keyword
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: As Needed
Data Presentation Form: Image (digital)
Distribution Liability:

Users must assume responsibility to determine the appropriate use of these data. DATA SHOULD NOT BE USED FOR LEGALLY BINDING APPLICATIONS.

Data Set Credit: NOAA Office for Coastal Management

Support Roles

Data Steward

CC ID: 830732
Date Effective From: 2023
Date Effective To:
Contact (Organization): Office for Coastal Management (OCM)
Address: 2234 South Hobson Avenue
Charleston, SC 29405-2413
Contact Instructions:


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 830734
W° Bound: 144.5
E° Bound: -64.5
N° Bound: 49.276
S° Bound: -14.5

Access Information

Security Class: Unclassified
Data Access Constraints:


Data Use Constraints:

Data set is not for use in litigation. While efforts have been made to ensure that these data are accurate and reliable, NOAA, cannot assume liability for any damages, or misrepresentations, caused by any inaccuracies in the data. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

Distribution Information

Distribution 1

CC ID: 830736
Download URL:

Download data by state.



CC ID: 830737
Name: NOAA SLR Viewer Tools Page
URL Type:
Online Resource


CC ID: 830738
Name: NOAA SLR Viewer
URL Type:
Online Resource


CC ID: 830740
Name: NOAA SLR Viewer Marsh Migration Mapping Methods
URL Type:
Online Resource

Data Quality

Completeness Report:

These data were derived from the most recent elevation data available at the date of processing that met project specifications, the most recent VDatum tidal model data available at the date of processing, and 2016 CCAP Land Cover data.



2016 Coastal Change Analysis Program (CCAP) Land Cover Data

CC ID: 830743
Contact Role Type: Originator
Contact Type: Organization
Contact Name: NOAA Office for Coastal Management
Citation URL:
Citation URL Description:

Customized Download

Source Contribution:

2016 land cover data were used to determine distribution of marsh land cover types.


CC ID: 830742
Contact Role Type: Originator
Contact Type: Organization
Contact Name: NOAA Office for Coastal Management
Citation URL:
Source Contribution:

Digital elevation models for CONUS, HI, American Samoa, Guam, CNMI, Puerto Rico, and the U.S. Virgin Islands.


CC ID: 830744
Contact Role Type: Originator
Contact Type: Organization
Contact Name: NOAA National Ocean Service
Citation URL:
Source Contribution:

VDatum tidal models were used to establish a relationship between the DEMs and various tidal datums.

Process Steps

Process Step 1

CC ID: 830745

A tidal zones raster is created for each increment of sea level rise (SLR) using a 10m DEM of a state and tidal surfaces created from VDatum representing MLLW, MTL, and MHHW. In addition, tidal surfaces for MHHWS (MHHW Spring) and a freshwater wetland-upland transition boundary are created from the VDatum MHHW tidal surface. This zones layer is an integer raster where each zone (i.e., MTL to MHHW) is coded. Select upland classes in the land cover source data are recoded in preparation for the next steps, resulting in a modified land cover raster where:

0 = Background

2 = High Intensity Developed

3 = Medium Intensity Developed

4 = Low Intensity Developed

5 = Developed Open Space

8 = All Uplands

13 = Palustrine Forested Wetland

14 = Palustrine Scrub/Shrub Wetland

15 = Palustrine Emergent Wetland

17 = Brackish/Transition Wetland

18 = Estuarine Wetland

19 = Unconsolidated Shore

21 = Open Water

The tidal zones raster for each SLR increment (0-10ft in 0.5ft increments) is then combined with the recoded land cover raster for the state to create a raster where pixels have both a tidal zone and a land cover code. Using a ruleset that says which land cover types exist in each tidal zone, the combined raster is recoded to a new land cover raster where the land cover class has changed based on the tidal zone. See for more detailed information.

Process Contact: Office for Coastal Management (OCM)

Catalog Details

Catalog Item ID: 55958
GUID: gov.noaa.nmfs.inport:55958
Metadata Record Created By: William Brooks
Metadata Record Created: 2019-03-25 10:39+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-05-30 18:09+0000
Metadata Record Published: 2020-11-13
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2020-11-13
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2021-11-13