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Short Citation:
National Centers for Coastal Ocean Science, 2022: La Parguera Accuracy Assessment Point Data for Benthic Habitats of Puerto Rico and the U.S. Virgin Islands, https://www.fisheries.noaa.gov/inport/item/39360.

Item Identification

Title: La Parguera Accuracy Assessment Point Data for Benthic Habitats of Puerto Rico and the U.S. Virgin Islands
Short Name: la_parguera_ac_assess
Status: Completed
Publication Date: 2001-12-01
Abstract:

This project is a cooperative effort among the National Ocean Service, National Centers for Coastal Ocean Science, Center for Coastal Monitoring and Assessment; the United States Geological Survey; the National Park Service; and the National Geophysical Data Center. The goal of this work was to develop coral reef mapping methods and compare the accuracy of benthic habitat maps generated from on-screen digitizing off of georeferenced color aerial photography, with maps digitized directly from hard copy photographs using a stereoplotter. Thematic accuracy of the Puerto Rico and U.S. Virgin Islands habitat maps was evaluated for the three most general habitat categories: unconsolidated sediment, submerged vegetation, and coral reef/hard bottom. Accuracy was estimated at two locations within the project area that included the full complement of habitat types, depth ranges, and water conditions representative of Puerto Rico and the U.S. Virgin Islands. For this reason, the accuracy of maps measured at these two locations is assumed to be representative of map accuracy elsewhere in the project area. This approach, which focused in two small areas, enabled a statistically robust evaluation of thematic accuracy to be conducted without the logistic difficulty of collecting data for accuracy assessment over the entire project area.Comparison with the accuracy assessment data revealed very similar levels of thematic accuracy between the two maps. Overall accuracy was 93.6 percent (Kappa 0.93). Maps produced from on-screen digitizing were almost 100 percent accurate for the submerged vegetation and unconsolidated sediment categories but misclassified a small percentage of hardbottom sites as unconsolidated sediment. Similarly, the maps produced using the stereoplotter were 100 percent accurate at classifying submerged vegetation but misclassified a small percentage of hardbottom and unconsolidated sediment sites. These findings suggest that both of these mapping techniques result in acceptable levels of thematic accuracy for maps produced at this scale with this type of classification scheme.

Purpose:

The National Ocean Service is conducting research to digitally map biotic resources and coordinate a long-term monitoring program that can detect and predict change in U.S. coral reefs, and their associated habitats and biological communities. The goal of this work was to develop coral reef mapping methods and compare the accuracy of benthic maps generated from on-screen digitizing off of georeferenced color aerial photography, with maps digitized directly from hard copy photographs using a stereoplotter.

Notes:

876

Keywords

Theme Keywords

Thesaurus Keyword
UNCONTROLLED
ISO 19115 Topic Category environment
ISO 19115 Topic Category oceans
None aerial photography
None benthic
None coral
None environmental monitoring
None habitat
None mangrove
None oceans
None reef
None SAV
None seagrass

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
None Culebra
None Desecheo
None Mona
None Puerto Rico
None U.S. Exclusive Economic Zone
None Vieques

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: Table (digital)
Entity Attribute Overview:

tab delimited text file; UTM coordinates; depth; most general habitat categories

Entity Attribute Detail Citation:

A complete description of the Puerto Rico and U.S. Virgin Islands Benthic Habitat Classification Scheme can be found at: http://ccma.nos.noaa.gov/products/biogeography/benthic/

Distribution Liability:

Data are not to be used for navigation.

Data Set Credit: Puerto Rico Department of Natural and Environmental Resources, University of Puerto Rico, United States Geological Survey, National Park Service, Virgin Islands Department of Planning and Natural Resources, Division Fish and Wildlife, University of Virgin Islands, Conservation Data Center, The Nature Conservancy, Sea Grant, and other local and regional experts for review

Support Roles

Data Steward

CC ID: 467183
Date Effective From: 2001-12-01
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Distributor

CC ID: 467185
Date Effective From: 2001-12-01
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Metadata Contact

CC ID: 467186
Date Effective From: 2001-12-01
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Point of Contact

CC ID: 467184
Date Effective From: 2001-12-01
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Principal Investigator

CC ID: 467187
Date Effective From: 2001-12-01
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: 467190
W° Bound: -68.01
E° Bound: -65.22
N° Bound: 18.59
S° Bound: 17.82

Extent Group 1 / Time Frame 1

CC ID: 467189
Time Frame Type: Discrete
Start: 1999-11

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Constraints:

None

Data Use Constraints:

None

Distribution Information

Distribution 1

CC ID: 467191
Download URL: http://coastalscience.noaa.gov/datasets/ccma/biogeo/benthic/aap/rico_aap.txt
Distributor:
Description:

Downloadable Data

File Type: Tab delimited text file

URLs

URL 1

CC ID: 467179
URL: http://coastalscience.noaa.gov/datasets/ccma/biogeo/benthic/aap/rico_aap.txt
URL Type:
Online Resource

URL 2

CC ID: 467180
URL: http://ccma.nos.noaa.gov/products/biogeography/benthic/data/
URL Type:
Online Resource

URL 3

CC ID: 467181
URL: http://ccma.nos.noaa.gov/products/biogeography/benthic/
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 467211
Activity Date/Time: 2014-08-13
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 467210
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: 584504
Activity Date/Time: 2017-09-13
Description:

Partial upload of Spatial Info section only.

Activity Log 4

CC ID: 716652
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 3; ESRI ArcCatalog 8.3.0.800

Data Quality

Accuracy:

Sites were examined visually. A datasheet was created based on the categories in the habitat classification scheme to facilitate assessment of habitat type at each site in the field. Once data were entered into spreadsheet format, a careful review was conducted to ensure that all labels were complete and accurate.

Horizontal Positional Accuracy:

Each preselected site was navigated to using real time DGPS. Habitat type(s) were recorded within an approximately 5-7 meter radius around each pre-selected site. Habitat type directly at the DGPS coordinates was recorded first followed by any secondary habitat types observed within the 5-7m radius of the DGPS point.

Completeness Report:

Logistics prevented evaluation of each site on the scale of the MMU (1 acre). Therefore, potential classification errors resulting from the difference between the MMU and size of accuracy assessment sites were accounted for in the analysis. For example, map classification was not considered incorrect in cases where an accuracy assessment point was scored as "sand" in the 5-7 meter area and the photointerpreter delineated a large, multiple acre polygon as "patchy seagrass", "aggregated patch reefs", and "colonized pavement with sand channels" since each of these classification categories have large areas composed of sand.

Conceptual Consistency:

The accuracy assessment dataset was collected in November 1999 for the La Parguera test area- eight months after the aerial photos were obtained. This short time interval minimized the possibility that habitats could have been altered significantly between the time of the aerial photography and collecting the accuracy assessment data.

Lineage

Process Steps

Process Step 1

CC ID: 467177
Description:

La Parguera, Puerto Rico was selected as a site for comparing thematic accuracy resulting from on-screen vs. stereoplotter digitizing due to several factors. First, almost all habitat types in the Puerto Rico/Virgin Islands project area are present at this site (except mud and mangroves). In addition, there is a long history of research focused on the habitat in and around La Parguera resulting in a variety of historical data with which to compare NOAA map products. Finally, there is excellent logistic support for field activities through the University of Puerto Rico. While map production was underway, habitat type at 200 sites was evaluated in the La Parguera test area to compare with habitat delineations derived from each mapping technique. A stratified sampling protocol was used during which sample sites were pre-selected so that overall thematic accuracy of the three major habitat types across the range of depths and water conditions found in the field could be evaluated.A datasheet was created based on the categories in the habitat classification scheme to facilitate assessment of habitat type at each site in the field. Each preselected site was navigated to using real time DGPS. Data recorded at each site included habitat type, depth, and other descriptive information. Depth was determined using a hand-held depth sounder. Habitat type(s) were recorded within an approximately 5-7 meter radius around each pre-selected site. Habitat type directly at the DGPS coordinates was recorded first followed by any secondary habitat types observed within the 5-7m radius of the DGPS point. In most cases, habitat type was the same for the DGPS point and area around each site since we preselected grid cells encompassing areas of uniform tone and texture in the imagery.Data recorded at each site was overlaid onto the habitat maps and compared against the classification assigned by the photointerpreters. After comparing the map classification to each ground truth site, an error matrix was produced displaying both errors of inclusion and exclusion. In addition, overall accuracy, users and producer's accuracy, and Kappa Statistic (measure of map accuracy relative to a map with classifications randomly assigned expressed as a percent) were reported.

Process Date/Time: 1999-11-01 00:00:00

Catalog Details

Catalog Item ID: 39360
GUID: gov.noaa.nmfs.inport:39360
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