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Short Citation:
Office for Coastal Management, 2022: Seagrasses, https://www.fisheries.noaa.gov/inport/item/56960.

Item Identification

Title: Seagrasses
Status: Completed
Publication Date: 2022-06-27
Abstract:

These data show aquatic vascular vegetation beds dominated by submerged, rooted, vascular species or submerged or rooted floating freshwater tidal vascular vegetation. This is not a complete collection of seagrasses on the seafloor, nor are the locations to be considered exact. The presence and location of the seagrasses have been derived from multiple state and federal sources.

Purpose:

To support ocean planning activities pursuant to the Executive Order Regarding the Ocean Policy to Advance the Economic, Security, and Environmental Interests of the United States, the Energy Policy Act, the National Environmental Policy Act, the Rivers and Harbors Act, and the Coastal Zone Management Act.

Supplemental Information:

Bureau Code: 006:48, Program Code: 006:055

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > HUMAN DIMENSIONS > ENVIRONMENTAL GOVERNANCE/MANAGEMENT
UNCONTROLLED
ISO 19115 Topic Category biota
ISO 19115 Topic Category environment
ISO 19115 Topic Category oceans
None aquatic vegetation
None benthic
None brackish
None eelgrass
None freshwater
None herbaceous
None macroalgae
None oceans
None oyster bed
None seagrass
None surfgrass
None tidal
None turf algal bed
None vascular

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
UNCONTROLLED
None Alabama
None Alaska
None California
None CNMI
None Commonwealth of the Northern
None Connecticut
None East Coast
None Florida
None Guam
None Gulf of Mexico
None Louisiana
None Maine
None Maryland
None Massachusetts
None Mississippi
None New Hampshire
None New Jersey
None New York
None North Carolina
None Oregon
None Rhode Island
None Territorial Sea
None Texas
None United States of America
None Virginia
None Washington

Physical Location

City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Entity Attribute Overview:

stateUSPS, aquaticSetting, bioticClass, bioticSubclass, bioticGroup, bioticCommunity, CMECS, cover, species1, species2, species3, species4, species5, species6, species7, sourceRecord, sourceDate, acres

Distribution Liability:

https://www.marinecadastre.gov/about/disclaimer.html

Data Set Credit: NOAA Office for Coastal Management, Bureau of Ocean Energy Management

Support Roles

Point of Contact

CC ID: 1097455
Date Effective From: 2021
Date Effective To:
Contact (Organization): Office for Coastal Management (OCM)
Address: 2234 South Hobson Avenue
Charleston, SC 29405-2413
URL: https://www.coast.noaa.gov/

Extents

Currentness Reference: Publication Date

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 863455
W° Bound: -166.28616
E° Bound: 145.78099
N° Bound: 60.386899
S° Bound: 13.237632

Extent Group 1 / Time Frame 1

CC ID: 863454
Time Frame Type: Discrete
Start: 2022
Description:

publication date

Access Information

Security Class: Unclassified
Data Use Constraints:

For coastal and ocean planning

Distribution Information

Distribution 1

CC ID: 863458
Download URL: https://marinecadastre.gov/data/
Distributor:
Description:

MarineCadastre.gov Data Registry

Distribution 2

CC ID: 863459
Download URL: https://marinecadastre.gov/downloads/data/mc/Seagrass.zip
Distributor:

Data Quality

Accuracy:

Untested

Horizontal Positional Accuracy:

Compiled to meet 10 meters horizontal accuracy at 95% confidence level

Completeness Report:

Untested

Conceptual Consistency:

These data are logically consistent

Lineage

Sources

BenthicCover

CC ID: 863435
Contact Name: MarineCadastre.gov
Extent Type: Discrete
Extent Start Date/Time: 2017-01-01
Citation URL: ftp://ftp.coast.noaa.gov/pub/MSP/BenthicCover.zip
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for Florida, Hawaii, Puerto Rico, US Virgin Islands, Guam, and CNMI (all shallow coral ecosystems areas, nationally)

BlueCarbon_2017_SHP

CC ID: 863441
Contact Name: Commission for Environmental Cooperation (CEC)
Citation URL: http://www.cec.org/sites/default/files/Atlas/Files/blue_carbon/BlueCarbon_2017_SHP.zip
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for Alaska and Oregon

CACO_Seagrass_CCS_surveys

CC ID: 863430
Contact Name: National Park Service
Citation URL: https://www.nps.gov/index.htm
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for Massachusetts (data provided via email)

Chand_2005

CC ID: 863434
Contact Role Type: Publisher
Contact Type: Organization
Contact Name: NOAA Office for Coastal Management (NOAA/OCM)
Extent Type: Discrete
Extent Start Date/Time: 2005-10-01
Citation URL: https://coast.noaa.gov/
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for Mississippi (data provided via email)

Christiaen_et_al_2016

CC ID: 863433
Contact Name: Dauphin Island Sea Lab
Extent Type: Discrete
Extent Start Date/Time: 2016-01-01
Citation URL: https://www.disl.org/
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for Florida (data provided via email)

eelgrass2015_2017

CC ID: 863436
Contact Name: Massachusetts Department of Environmental Protection
Citation URL: http://download.massgis.digital.mass.gov/shapefiles/state/eelgrass2015_2017.zip
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for Massachusetts

FIIS_Seagrass

CC ID: 863428
Contact Name: New York Governor's Office of Storm Recovery (GOSR)
Extent Type: Discrete
Extent Start Date/Time: 2018-01-01
Citation URL: https://stormrecovery.ny.gov/
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for New York (data provided via email)

LISS2018d

CC ID: 863443
Contact Name: University of Rhode Island
Extent Type: Discrete
Extent Start Date/Time: 2018-01-01
Citation URL: https://www.uri.edu/
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for New York (data provided via email)

NoCA_estuaries

CC ID: 863439
Contact Name: California Department of Fish and Wildlife
Citation URL: https://www.wildlife.ca.gov/
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for California (data provided via email)

PMEP_West_Coast_Eelgrass_V1

CC ID: 863437
Contact Name: Pacific Marine and Estuarine Fish Habitat Partnership (PMEP)
Citation URL: http://www.pacificfishhabitat.org/data/west-coast-usa-eelgrass-habitat/
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for California, Oregon, and Washington

SAV2015

CC ID: 863440
Contact Name: Dauphin Island Sea Lab
Extent Type: Discrete
Extent Start Date/Time: 2015-01-01
Citation URL: https://www.disl.org/
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for Alabama (data provided via email)

sav2016

CC ID: 863444
Contact Name: Virginia Institute of Marine Science
Extent Type: Discrete
Extent Start Date/Time: 2016-01-01
Citation URL: http://web.vims.edu/bio/sav/gis_data.html
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for Virginia

seagrass_fl_poly

CC ID: 863429
Contact Name: Florida Fish and Wildlife Conservation Commission
Citation URL: https://myfwc.com/research/habitat/seagrasses/
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for Florida

Seagrasses

CC ID: 863442
Contact Name: California National Marine Fisheries Service
Citation URL: https://marinecadastre.gov/data/
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided source data originally received directly from sources via email or downloaded online, for previously developed national data set.

sg_16_springscoast

CC ID: 863431
Contact Name: Southwest Florida Water Management District
Extent Type: Discrete
Extent Start Date/Time: 2016-01-01
Citation URL: ftp://ftp.swfwmd.state.fl.us/pub/gisdata/swim/sg16_springscoast.zip
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for Florida

Submerged_Aquatic_Vegetation_2016

CC ID: 863427
Contact Name: Rhode Island Geographic Information System
Citation URL: http://www.rigis.org/datasets/submerged-aquatic-vegetation-sav-in-ri-coastal-waters-2016
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for Rhode Island

SVMPdata_2000-2017

CC ID: 863432
Contact Name: Washington State Department of Natural Resources
Citation URL: https://www.dnr.wa.gov/
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided SVMP and ShoreZone data for Washington (data provided via email)

tpwd-seagrass

CC ID: 863438
Contact Name: Texas Parks and Wildlife Department
Extent Type: Discrete
Extent Start Date/Time: 2012-01-01
Citation URL: https://tpwd.texas.gov/gis/resources/tpwd-seagrass.zip
Citation URL Name: Source Online Linkage
Citation URL Description:

URL where the source data were originally accessed.

Source Contribution:

Provided data for Texas

Process Steps

Process Step 1

CC ID: 863445
Description:

1) Acquire original source data

2) IMPORT each shapefile into a File Geodatabase

3) PROJECT into NAD83

4) DISSOLVE each state feature class based on all fields except Object ID, Acres, Shape Length, and Shape Area to remove data overlap

5) EXPLODE all multipart features in each state feature class

6) APPEND all state feature classes into a single feature class

7) Check for overlapping features and MERGE into a single feature

8) RENAME field names to match the the proposed data dictionary

9) DELETE all superfluous fields

10) Execute the CHECK GEOMETRY function

Process Date/Time: 2013-10-01 00:00:00

Process Step 2

CC ID: 863446
Description:

1) Acquire data from sources by URL download or email. Determine if the new source data supersedes existing national data set. DELETE the older, superseded features and replace with the newer source data

2) MERGE new data sets and features into the former national data set, carrying over values from the necessary source fields that match the current data's schema

3) For ShoreZone polyline features within the Washington state DNR data, features were buffered five feet in order to generate the polygon format required of this data set. In this case, coverage was denoted as 'Present', since the polygon does not represent the footprint of the seagrass here, just that it was present somewhere along this shoreline segment

4) Convert the multipart layer to singlepart and then project into an equal area projection (example: USA Contiguous Albers Equal Area Conic). Add a new field called Acreage and calculate the geometry of the features. (Special note for the Washington state DNR data: per request of the source, the acreage values for the ShoreZone features were set to Null, and the acreage values for the SVMP features were derived from the source and not calculated separately.) Project the data back into NAD83

5) Remove all unnecessary fields and populate others according to data dictionary

6) Visually inspect older features for overlap with newer data. For example, if data from the 1970s within a small estuary is immediately adjacent to and overlapping data from 2016, remove the data from the 1970s

7) Execute the REPAIR GEOMETRY function

PLEASE NOTE: Per request of the Washington state DNR, the acreage values for the ShoreZone features were set to Null, and the acreage values for the SVMP features were derived from the source and not calculated separately

Process Date/Time: 2019-01-01 00:00:00

Process Step 3

CC ID: 863447
Description:

1) Acquire source data

PLEASE NOTE: For Washington state, a large percentage of the state's coastline was designated as having seagrass based on a crosswalk between survey units (polygons) and shoreline seagrass status (polylines). Where polylines that were attributed as "seagrass present", polygons that intersected these line segments were extracted. While the resulting polygons (i.e. survey units) express that seagrass is found therein, it does not represent the footprint of the seagrass extent. Conversely, in some cases seagrass footprints were provided, such as in: Willapa Bay, Padilla Bay, and areas of Snohomish County. [Survey units originated from the Submerged Vegetation Monitoring Project (for Puget Sound and Strait of Juan de Fuca) and the Washington Marine Vegetation Atlas (for the Pacific coast). Shoreline status was provided by Washington state's ShoreZone inventory.]

2) Polygon to polyline crosswalk (noted above) performed in Washington state

3) Shoreline data (denoting seagrass presence) from California DFW was buffered by 20 meters to create polygons (i.e. generalized footprints)

4) PROJECT each data set in NAD83 GRS 80

5) ADD fields (date, provider, location) to each data set then populated

6) ERASE data sets that overlap, and retain the newer data or data determined to be preferential to another

7) MERGE all data sets

8) Removed unnecessary fields and populated others according to data dictionary

9) SPLIT merged data by UTM (zone 10 and 11), explode features, and CALCULATE area of polygons in acres

10) MERGE data from both zones then execute the CHECK GEOMETRY function

Process Date/Time: 2015-03-01 00:00:00

Process Step 4

CC ID: 1176870
Description:

1) Execute the REPAIR GEOMETRY function to remove null features and fix non-simple features

2) Modify field names for usability, and to avoid common controlled vocabulary

Process Date/Time: 2022-06-26 00:00:00

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity Seagrasses in the United States

Catalog Details

Catalog Item ID: 56960
GUID: gov.noaa.nmfs.inport:56960
Metadata Record Created By: Jesse Brass
Metadata Record Created: 2019-07-17 14:41+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2019-07-17
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2019-07-17
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2020-07-17