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Short Citation:
National Centers for Coastal Ocean Science, 2022: 1992 Seagrass and Mangrove Habitats of the Salt River Bay National Historical Park and Ecological Preserve, https://www.fisheries.noaa.gov/inport/item/39483.

Item Identification

Title: 1992 Seagrass and Mangrove Habitats of the Salt River Bay National Historical Park and Ecological Preserve
Short Name: sari_1992_sg_mang_met
Status: Completed
Publication Date: 2004
Abstract:

Habitat maps were created as part of a larger ecological assessment conducted by NOAA's National Ocean Service (NOS), Biogeography Branch, for Salt River Bay National Historic Park and Ecological Preserve (National Park Service).Aerial photographs were obtained for 1992 from the National Geodetic Survey, and were orthorectified by the Biogeography Branch. A classification scheme was set up with 20 benthic habitat types, 19 land cover types, and 13 mangrove habitat types. For this map of seagrass and mangrove habitats during 1992 only the 3 seagrass, and 14 mangrove classification categories were used. These were mapped directly into a GIS system through visual interpretation of orthorectified aerial photographs.

Purpose:

These maps were created to support current and future monitoring and management efforts of the National Park Service (NPS) for this site, and support the programmatic objectives of the NPS service-wide Inventory and Monitoring Program. In particular, maps created from the time series of the photographs cover periods both before and after Hurricane Hugo (1989), providing insight to habitat changes that occurred following the disaster.

Notes:

844

Keywords

Theme Keywords

Thesaurus Keyword
UNCONTROLLED
CoRIS Discovery Thesaurus Version 1 Geographic Information > polygons
CoRIS Discovery Thesaurus Version 1 Map Images > Coral Mapping
CoRIS Theme Thesaurus Version 1 Coral reef > Coral reef monitoring and assessment > Remote sensing
CoRIS Theme Thesaurus Version 1 EARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic Habitat
CoRIS Theme Thesaurus Version 1 EARTH SCIENCE > Biosphere > Zoology > Corals > Reef monitoring and assessment > Coral Reef Mapping > Base map > Aerial photography
CoRIS Theme Thesaurus Version 1 EARTH SCIENCE > Oceans > Coastal Processes > Mangroves > Monitoring > Remote Sensing
CoRIS Theme Thesaurus Version 1 EARTH SCIENCE > Oceans > Marine Biology > Marine Plants > Seagrass > Seagrass Monitoring > Remote Sensing
ISO 191115 Topic Category biota
ISO 191115 Topic Category environment
ISO 191115 Topic Category oceans
NOS Data Explorer Topic Category Environmental Monitoring
NOS Data Explorer Topic Category National Park Service

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
Coris Place Thesaurus Version 1 COUNTRY/TERRITORY > United States of America > US Virgin Islands > St. Croix > St. Croix (17N064W0003)
None Salt River Bay
None Salt River Bay Historical Park and Ecological Preserve
None St. Croix
None U.S. Virgin Islands

Physical Location

Organization: National Centers for Coastal Ocean Science
City: Silver Spring
State/Province: MD

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Data Presentation Form: vector digital data
Distribution Liability:

The National Oceanic and Atmospheric Administration (NOAA) National Centers for Coastal Ocean Science (NCCOS) produced this data for Salt River Bay National Historic Park and Ecological Preserve (NPS). NCCOS Biogeography Branch does not guarantee the accuracy of the geographic features or attributes. Please see the metadata records for each data set for complete information on the source, limitations, and proper use. Disclaimer - While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

Data Set Credit: Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch

Support Roles

Data Steward

CC ID: 472018
Date Effective From: 2004
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Distributor

CC ID: 472020
Date Effective From: 2004
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Metadata Contact

CC ID: 472021
Date Effective From: 2004
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Point of Contact

CC ID: 472019
Date Effective From: 2004
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Principal Investigator

CC ID: 472022
Date Effective From: 2004
Date Effective To:
Contact (Person): Kendall, Matt
Email Address: matt.kendall@noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 472025
W° Bound: -64.761931
E° Bound: -64.750033
N° Bound: 17.78329
S° Bound: 17.765249

Extent Group 1 / Time Frame 1

CC ID: 472024
Time Frame Type: Discrete
Start: 1992-01-31

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Vector Representation 1

CC ID: 585810
Complex Object Present?: Yes
Complex Object Count: 263

Access Information

Security Class: Unclassified
Data Access Constraints:

None

Data Use Constraints:

Not for Navigation

Distribution Information

Distribution 1

CC ID: 472026
Download URL: http://coastalscience.noaa.gov/datasets/ccma/biogeo/sari/sari_1992_sg_mang.zip
Distributor:
Description:

Downloadable Data

File Type: shapefile

URLs

URL 1

CC ID: 472014
URL: http://coastalscience.noaa.gov/datasets/ccma/biogeo/sari/sari_1992_sg_mang.zip
URL Type:
Online Resource

URL 2

CC ID: 472015
URL: http://ccma.nos.noaa.gov/products/biogeography/sari_cd/data/
URL Type:
Online Resource

URL 3

CC ID: 472016
URL: http://ccma.nos.noaa.gov/products/biogeography/sari_cd/
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 472045
Activity Date/Time: 2013-07-24
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 472044
Activity Date/Time: 2017-04-05
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.

Activity Log 3

CC ID: 585808
Activity Date/Time: 2017-09-13
Description:

Partial upload of Spatial Info section only.

Activity Log 4

CC ID: 601375
Activity Date/Time: 2017-11-01
Description:

Replaced entire Lineage section to populate new Source Contribution field.

Activity Log 5

CC ID: 716730
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Technical Environment

Description:

Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800

Data Quality

Accuracy:

Methods used to create this map were similar to those used to maps of the U.S. Virgin Islands and Puerto Rico by the same office ("Benthic Habitat Maps of Puerto Rico and the U.S. Virgin Islands", 2001). An accuracy assessment conducted for the original maps was designed to determine the accuracy of maps generated from on-screen digitizing using the ArcView Habitat Digitizer Extension. Benthic habitat maps exhibited an overall accuracy of 93.6 percent (Kappa 0.90-0.93) for on-screen digitizing. In comparison, the map described here was created from higher resolution imagery (25 microns), finer minimum mapping unit (MMU) (100 square meters), and habitat delineation occurred at a smaller image scale (1:1500). A greater number of ground truth points over more habitat types were verified for the year 2000 mapping data, in a study site of much smaller area. Ground truth points could not be taken for the 1992 data directly, however, year 2000 points were referenced when appropriate. Mapping methods were otherwise identical to those used previously. Attribute accuracy was therefore presumed to be equivalent to or better than that of the previous map, although a formal assessment was not conducted on the current map directly.

Horizontal Positional Accuracy:

The Minimum Mapping Unit (MMU) restriction was set to 100 square meters and digitizing was conducted at 1:1500 scale. Polygons were digitized directly from georegistered orthophotos with spatial accuracy approximately 1.0 meter. These maps represent conditions at the time the aerial photographs were obtained. When considering horizontal map accuracy, it is important to keep in mind that the ocean floor is a dynamic environment. Physical factors such as currents, erosion, and hurricanes and biological factors such as seasonal growth and die-off, affect the distribution and stability of terrestrial, mangrove and benthic habitats in this environment.

Completeness Measure:

Cloud Cover: 0

Completeness Report:

Delineation of all habitat boundaries was conducted with the image scale at 1:1500. All polygons were digitized at this scale except when subtle habitat boundaries were not easily discernable at 1:1500 and zooming out to a more broad scale was required to place boundaries correctly. Digitizing at a uniform scale ensures that the level of detail produced by the photointerpreter is consistent throughout the project. The Minimum Mapping Unit (MMU) for identifying habitats or features was 100 square meters for visual photointerpretation. The software utilized in this project was designed to alert the photointerpreter each time a polygon was drawn smaller than the MMU. When this occurred, the photointerpreter has the choice of whether to include the polygon in the dataset or not.

Conceptual Consistency:

Individual color aerial photographs from 1992 were georeferenced and mosaicked. Approximately 10-15 ground control points were used to orthorectify the mosaic. During the digitizing process, image stretches and manipulating image contrast, brightness and color balance were performed in the ArcView Image Analysis Extension to enhance features in the processed imagery. Additional, collateral information including previously completed habitat maps, NOS nautical charts, and other descriptive references dealing with benthic and coastal habitats of St. Croix were used to assist with image interpretation. Over 200 ground truth points were also checked with year 2000 imagery to verify photographic signature with habitat interpretation. Though 1992 habitats could not be directly verified in the same fashion, where appropriate, collateral information from the year 2000 points was considered during 1992 habitat deliniation. GIS topologic quality was established by executing ArcView extension routines that check for: overlapping polygons, multipart polygons, sliver polygons and void polygons. Additionally, checks for adjacent polygons with the same habitat attributes were completed. All errors were identified and corrected. This file is believed to be logically consistent.

Lineage

Sources

ArcView Habitat Digitizer Extension v 3.1

CC ID: 601377
Contact Name: Ken Buja
Publish Date: 2001-01-01
Extent Type: Discrete
Extent Start Date/Time: 2001
Citation URL: http://ccma.nos.noaa.gov/products/biogeography/digitizer/
Source Contribution:

This ArcView extension was used to digitize and attribute benthic zones and habitats for Puerto Rico and the U.S. Virgin Islands. | Type of Source Media: computer program

Benthic Habitats of Puerto Rico and the U.S. Virgin Islands

CC ID: 601376
Contact Name: Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Centers for Coastal Ocean Science (NCCOS), Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch
Publish Date: 2001-01-01
Extent Type: Range
Extent Start Date/Time: 1999
Extent End Date/Time: 2001
Citation URL: http://ccma.nos.noaa.gov/products/biogeography/benthic/
Source Contribution:

This document identifies the benthic habitat types attributed in this data set. | Source Geospatial Form: vector digital data | Type of Source Media: CD-ROM

NGS Color Aerial Photography

CC ID: 601378
Contact Name: National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), National Geodetic Survey (NGS)
Publish Date: 1992-01-01
Extent Type: Discrete
Extent Start Date/Time: 1992-01-31
Source Contribution:

Benthic features were interpreted and mapped from NGS aerial photos of the Salt River Bay region of aerial photographs of St. Croix, U.S.V.I. | Source Geospatial Form: remote-sensing image | Type of Source Media: aerial photography and scanned photographs

Process Steps

Process Step 1

CC ID: 601379
Description:

Benthic habitat maps were digitized by delineating habitat boundaries from georeferenced imagery loaded into ArcView 3.2 GIS software with the Image Analysis extension and NOAA Coral Reef Habitat Digitizing extensions both activated. On-screen digitizing was conducted with the minimum mapping unit (MMU) set to 100 square meters and the image scale at 1:1500. During the digitizing process, image stretches and manipulation of image contrast, brightness and color balance were performed in the ArcView Image Analysis Extension to enhance features in the processed imagery. Additional collateral information, including previously completed habitat maps, NOS nautical charts, and other descriptive references dealing with benthic and coastal habitats of Salt River National Historic Park and Ecological Preserve was used to assist with image interpretation. A first draft map was completed and features in the imagery where uncertainties existed, due to confusing or difficult to interpret signatures, were identified for future ground validation effort. Since maps were based on historical imagery that didn't necessarily reflect current ground condition, similar signatures were identified in year 2000 aerial photographs. An ArcView GIS point theme was generated with points positioned on the features of uncertain habitat type or along transects through gradients between habitat types. The GIS points were converted to GPS waypoints, and were visited for on the ground habitat validation.Benthic habitat characterization was conducted at each site by snorkeling, free diving, or via observations from the surface where water depth and clarity permitted. Mangrove habitat characterization was conducted by driving, kayaking or hiking to points and visually identifying mangrove type and cover. GPS data was collected at each location, and site ID, depth, habitat type, and the method used to make the assessment were recorded. The ground validation data was incorporated into the second draft of each map.

Process Date/Time: 2004-01-01 00:00:00

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity SARI_1992_sg_mang

Catalog Details

Catalog Item ID: 39483
GUID: gov.noaa.nmfs.inport:39483
Metadata Record Created By: Tyler Christensen
Metadata Record Created: 2017-04-05 12:52+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2018-02-08
Owner Org: NCCOS
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2018-02-08
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2019-02-08