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Short Citation:
National Centers for Coastal Ocean Science, 2023: Accuracy Assessment Field Data for American Samoa,

Item Identification

Title: Accuracy Assessment Field Data for American Samoa
Short Name: as_aa_gps
Status: Completed
Publication Date: 2004-06-28

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 incorporate previously developed mapping methods to produce coral reef habitat maps for American Samoa, Guam and the Commonwealth of the Northern Mariana Islands. GPS field observations were used to establish the thematic accuracy of this thematic product. 651 benthic habitat characterizations were completed for this work.


The National Ocean Service is preparing digital map products of these biotic resources and coordinates 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 the work was to implement previously developed coral reef mapping methods to produce GIS map products of benthic habitats by photo interpreting georeferenced remotely sensed imagery. These Accuracy Assessment point data were generated to assess the accuracy of the individual maps created from IKONOS satellite imagery.




Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
ISO 19115 Topic Category
ISO 19115 Topic Category
None coral reef
None coralline algae
None Cover
None environmental monitoring
None habitat
None oceans
None Point
None reef
None Structure
None Submerged aquatic vegetation
None unconsolidated sediments
None zone

Spatial Keywords

Thesaurus Keyword
None American Samoa
None Manua
None Rose Atoll
None Swains Island
None Tutuila
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: 462200
Date Effective From: 2004-06-28
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:


CC ID: 462202
Date Effective From: 2004-06-28
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Metadata Contact

CC ID: 462203
Date Effective From: 2004-06-28
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Point of Contact

CC ID: 462201
Date Effective From: 2004-06-28
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Principal Investigator

CC ID: 462204
Date Effective From: 2004-06-28
Date Effective To:
Contact (Person): Battista, Tim
Email Address:


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 462207
W° Bound: -170.768961
E° Bound: -169.600734
N° Bound: -14.151342
S° Bound: -14.371379

Extent Group 1 / Time Frame 1

CC ID: 462206
Time Frame Type: Range
Start: 2002
End: 2003

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Vector Representation 1

CC ID: 584156
Point Object Present?: Yes
Point Object Count: 613

Access Information

Security Class: Unclassified
Data Access Procedure:

Contact NOAA for distribution options (see Distributor).;

Data Access Constraints:


Data Use Constraints:

Not for navigation

Distribution Information

Distribution 1

CC ID: 462209
Download URL:

Downloadable Data

File Type: shapefile

Distribution 2

CC ID: 462208
Download URL:

Downloadable Data

File Type: shapefile



CC ID: 462197
URL Type:
Online Resource


CC ID: 462198
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 462232
Activity Date/Time: 2014-07-09

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 462231
Activity Date/Time: 2017-04-05

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using '' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 584154
Activity Date/Time: 2017-09-13

Partial upload of Spatial Info section only.

Activity Log 4

CC ID: 600866
Activity Date/Time: 2017-11-01

Replaced entire Lineage section to populate new Source Contribution field.

Activity Log 5

CC ID: 716613
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Technical Environment


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

Data Quality


The points in this thematic data were acquired by GPS using a Trimble GeoExplorer 3 with a customized data dictionary designed to reflect the NOAA Classification Scheme for Benthic Habitats of the Pacific. All habitat determinations were made in the field, recorded in the GPS data logger and seamlessly transferred to ArcView GIS using Trimble Path Finder Office Software.

Horizontal Positional Accuracy:

Point accuracy was determined by three tests producing circular RMS statistic. Point GPS data were acquired by repeated occupation a fixed point yielding a 95% sigma RMS of 2 meters compared to the position mean. Replicate GPS positions were collected after navigating to a way point by boat yielding RMS value of 5 meters. Registered monuments were occupied and replicate positions collected yielding an RMS value of 3 meters. Thus, all point features in these accuracy assessment data are at least 95% sigma of 5 meters.

Completeness Report:

Data are complete. Habitat attributes are determined by direct observation in the field. These data are considered truth at the time of collection. Habitat types are subject to change over time due to population dynamics of the dominant biological communities.

Conceptual Consistency:

To maintain objectivity in the analysis of accuracy, all field observations were withheld from the photointerpreter. Furthermore, Coral Reef Assessment and Monitoring Program (CRAMP) of the Hawaii Institute of Marine Biology (HIMB) conducted the determination of the extent to which the photointerpretation met the field assessment determinations. These data were then used to prepare the statistical report of the accuracy of the maps.Transfer of the habitat assessment data is seamless from the field determination to the final GIS product. The data is not transcribed or rewritten by hand. Errors in processing are not expected.



Classification Scheme for Benthic Habitats of the Pacific

CC ID: 600868
Contact Name: M.S. Coyne
Publish Date: 2003-01-01
Extent Type: Discrete
Extent Start Date/Time: 2003
Citation URL:
Source Contribution:

This document identifies the zone and habitat types attributed in the GIS data. | Source Geospatial Form: document | Type of Source Media: publication

Random Point Generator

CC ID: 600867
Contact Name: Jeff Henness
Publish Date: 2001-06-15
Extent Type: Discrete
Extent Start Date/Time: 2001-06-15
Citation URL:
Source Contribution:

Random points were generated to test the accuracy of benthic habitat maps. | Type of Source Media: Software

Process Steps

Process Step 1

CC ID: 600869

After photointerpretation was complete, 50 random geographically referenced points were created in each structure and cover detailed class. This was done using a random point generator program obtained from the ESRI website, which randomly generates points inside an ArcView GIS polygon. Waypoint files were generated from these points and all waypoints, which could be safely accessed, were navigated to using a Trimble GeoExplorer 3 GPS data logger and a benthic habitat characterization was conducted.

Process Date/Time: 2003-01-01 00:00:00
Source: Random Point Generator

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity as_aa_gps_final

Catalog Details

Catalog Item ID: 39244
GUID: gov.noaa.nmfs.inport:39244
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: 2023-05-30 18:09+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