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Short Citation:
National Centers for Coastal Ocean Science, 2022: Benthic Habitats of Guam Derived From IKONOS Imagery, 2001-2003, https://www.fisheries.noaa.gov/inport/item/39320.

Item Identification

Title: Benthic Habitats of Guam Derived From IKONOS Imagery, 2001-2003
Short Name: guam_benthic_haitats
Status: Completed
Publication Date: 2004
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 University of Hawaii; BAE Systems Spectral Solutions; and Analytical Laboratories of Hawaii, LLC. The goal of the work was to map the coral reef habitats of American Samoa, Guam and the Commonwealth of the Northern Mariana Islands by visual interpretation and manual delineation of IKONOS satellite imagery. A two tiered habitat classification system was tested and implemented in this work. It integrates geomorphologic reef structure and biological cover into a single scheme and subsets each into detail. It also includes thirteen zones. Benthic features were mapped that covered an area of 104 square kilometers of which 32.9 were unconsolidated sediment and 71.6 were coral reef and hard bottom. Of the coral reef and hard bottom class, 35.6% is colonized by greater than 10% coral cover.

Purpose:

The National Ocean Service is conducting a map production effort 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.

Notes:

591

Keywords

Theme Keywords

Thesaurus Keyword
UNCONTROLLED
ISO 19115 Topic Category biota
ISO 19115 Topic Category environment
ISO 19115 Topic Category oceans
None coral reef
None coralline algae
None cover
None environmental monitoring
None habitat
None reef
None structure
None submerged aquatic vegetation
None unconsolidated sediments
None zone

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
None Guam
None Mariana Islands
None United States

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 CD-ROM. 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.

Support Roles

Data Steward

CC ID: 465716
Date Effective From: 2004
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Distributor

CC ID: 465718
Date Effective From: 2004
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Metadata Contact

CC ID: 465719
Date Effective From: 2004
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Point of Contact

CC ID: 465717
Date Effective From: 2004
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address: NCCOS.data@noaa.gov

Principal Investigator

CC ID: 465720
Date Effective From: 2004
Date Effective To:
Contact (Person): Battista, Tim
Email Address: tim.battista@noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 465723
W° Bound: 144.599648
E° Bound: 144.9727
N° Bound: 13.669406
S° Bound: 13.22229

Extent Group 1 / Time Frame 1

CC ID: 465722
Time Frame Type: Range
Start: 2003
End: 2004

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Vector Representation 1

CC ID: 584386
Complex Object Present?: Yes
Complex Object Count: 1068

Access Information

Security Class: Unclassified
Data Access Procedure:

Contact NOAA for distribution options (see Distributor).;

Data Access Constraints:

None

Data Use Constraints:

Not for navigation

Distribution Information

Distribution 1

CC ID: 465724
Download URL: http://coastalscience.noaa.gov/datasets/ccma/biogeo/us_pac_terr/habitats/guam_habitat.zip
Distributor:
Description:

Downloadable Data

File Type: shapefile

URLs

URL 2

CC ID: 465713
URL: http://ccma.nos.noaa.gov/ecosystems/coralreef/us_pac_terr/data/habitats.aspx
URL Type:
Online Resource

URL 3

CC ID: 465714
URL: http://ccma.nos.noaa.gov/ecosystems/coralreef/us_pac_terr/data/
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 465742
Activity Date/Time: 2014-07-09
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 465741
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: 584384
Activity Date/Time: 2017-09-13
Description:

Partial upload of Spatial Info section only.

Activity Log 4

CC ID: 601006
Activity Date/Time: 2017-11-01
Description:

Replaced entire Lineage section to populate new Source Contribution field.

Activity Log 5

CC ID: 716637
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Technical Environment

Description:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 9.0.0.535

Data Quality

Accuracy:

A statistically robust field data set was collected to assess the thematic accuracy of the map products. A random stratified sampling method was implemented to select field sites to conduct this test. Each site was navigated to using a Trimble Geo Explorer 3 GPS data logger, and positional data was acquired. A total of 1,113 GPS waypoints were occupied and benthic characterizations conducted for the purpose of accuracy assessment. Areas that were obscured by cloud cover or where other environmental conditions such as glint of turbidity prevented visual interpretation of the benthic habitats were assigned an attribute of "unknown". Field observations that fell in polygons designated "unknown" were not included in the statistical analysis. During this survey, 5 of the 1,113 field observations were excluded for this reason and 1,108 observations were used in the accuracy assessment.A statistical analysis that generated a Tau statistic was preformed. The Tau statistic for the major classes exceeded 0.85 and for detailed classes exceeded 0.75. Overall thematic accuracy was established as 98.7% and 92.6% for the major structure and cover classes and 87.8% and 80.9% for the detailed classes respectively for the entire Mariana Archipelago.

Horizontal Positional Accuracy:

RMS from digitized output was determined using the ESRI RMEer2 extension and shown to be less than 1m when conducted at 1:6000 scale.

Completeness Report:

NOAA supplied georeferenced imagery to Analytical Laboratories of Hawaii through BAE Systems Spectral Solutions. Delineation of all habitat boundaries was conducted with the image scale at 1:6,000. This ensures that the level of detail produced by the photo interpreter is uniform throughout the project. Also, NOAA has shown from similar mapping efforts in the Caribbean and Florida Keys, that little additional information is gained from having the image at a smaller scale and the labor intensity increased significantly. The minimum mapping unit (MMU) for identifying habitats or features was 1 acre. The software utilized in this project was designed to alert the photo interpreter each time a polygon was drawn smaller than the MMU. When this occurred the photo interpreter has the choice whether to include the polygon in the data set. Only in areas where local coral reef managers expressed interest in specific map classes or in Marine Protected Areas were polygons of smaller then the MMU allowed.

Conceptual Consistency:

All mapping was conducted from orthorectified IKONOS satellite imagery provided by NOS prior to map production. IKONOS satellite imagery was corrected for atmospheric and water column effects, color balanced, pan sharpened and deglinted. 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. 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

Classification Scheme for Benthic Habitats of the Pacific

CC ID: 601007
Contact Name: M.S. Coyne
Publish Date: 2003-01-01
Extent Type: Discrete
Extent Start Date/Time: 2003
Citation URL: http://ccma.nos.noaa.gov/ecosystems/coralreef/us_pac_terr/html/methods.aspx
Source Contribution:

This document identified the zone, structure and biological cover types attributed in the data set | Source Geospatial Form: document | Type of Source Media: Report

Coral Reef Digitizing Extension

CC ID: 601008
Contact Name: Ken Buja
Publish Date: 2003-01-01
Extent Type: Discrete
Extent Start Date/Time: 2003
Citation URL: http://coastalscience.noaa.gov/projects/detail?key=203
Source Contribution:

This ArcView extension was used to digitize and attribute benthic zones, structure and biological cover of this map. | Type of Source Media: computer program

IKONOS Satellite Imagery

CC ID: 601009
Contact Name: Space Imaging Inc.
Publish Date: 2003-01-01
Extent Type: Range
Extent Start Date/Time: 2001
Extent End Date/Time: 2003
Citation URL: http://www.spaceimaging.com
Source Contribution:

Used to identify and digitize benthic habitats for Guam. | Source Geospatial Form: remote-sensing image | Type of Source Media: CD-ROM

Process Steps

Process Step 1

CC ID: 601010
Description:

Benthic habitat maps were digitized by delineating habitat boundaries from georeferenced orthorectified IKONOS satellite imagery loaded into ArcView 3.3 GIS software with the Image Analysis and NOAA Coral Reef Habitat Digitizing extensions both activated. Digitizing was conducted using heads-up on computer screen methods with the minimum mapping unit (MMU) set to 1 acre and the image scale at 1:6,000. All IKONOS imagery was processed by NOS prior to map production. The imagery was corrected for atmospheric and water column effects, pan sharpened and deglinted. During the digitizing process, images were stretched and contrast, brightness and color balance were modified using the Arc View Image Analysis Extension to enhance features in the processed imagery. 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. An ArcView GIS point theme was generated with points positioned on the features of uncertain habitat type or along transects though gradients between habitat types. The GIS points were converted to GPS waypoints using Trimble Pathfinder Software and were navigated to in the field using a Trimble GeoExplorer 3 GPS data logger.A benthic habitat characterization was conducted at each site by snorkeling, free diving, or where water depth and clarity permitted, by observation from the surface . GPS data were collected at each location and site ID, depth, habitat type, zone and the method used to make the assessment were recorded. A second draft of the map was generated incorporating these ground validation data.

Process Date/Time: 2003-01-01 00:00:00
Source: Classification Scheme for Benthic Habitats of the Pacific

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity guam_draft_map

Catalog Details

Catalog Item ID: 39320
GUID: gov.noaa.nmfs.inport:39320
Metadata Record Created By: Tyler Christensen
Metadata Record Created: 2017-04-05 12:51+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