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Short Citation:
National Centers for Coastal Ocean Science, 2023: Accuracy Assessment Field Data for Benthic Habitat Maps of Palau,

Item Identification

Title: Accuracy Assessment Field Data for Benthic Habitat Maps of Palau
Short Name: palau_aa
Status: Completed
Publication Date: 2006-08-04

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; IMSG; 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 The Republic of Palau. GPS field observations were used to establish the thematic accuracy of this thematic product. 623 benthic habitat characterizations were completed in UTM Zone 53N 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 ortho-rectified remotely sensed imagery. These Accuracy Assessment point data were generated to assess the thematic accuracy of these habitat maps.




Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
ISO 19115 Topic Category
NOS Data Explorer Topic Category Environmental Monitoring
None coral reef
None coralline algae
None cover
None habitat
None oceans
None point
None reef
None structure
None submerged aquatic vegetation
None unconsolidated sediments
None zone

Spatial Keywords

Thesaurus Keyword
None Republic of Palau

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) will publish this data on CD-ROM. NCCOS Biogeography Program 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: 469872
Date Effective From: 2006-08-04
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:


CC ID: 469874
Date Effective From: 2006-08-04
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Metadata Contact

CC ID: 469875
Date Effective From: 2006-08-04
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Point of Contact

CC ID: 469873
Date Effective From: 2006-08-04
Date Effective To:
Contact (Position): NCCOS Scientific Data Coordinator
Email Address:

Principal Investigator

CC ID: 469876
Date Effective From: 2006-08-04
Date Effective To:
Contact (Person): Battista, Tim
Email Address:


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 469879
W° Bound: 134.215454
E° Bound: 134.644087
N° Bound: 7.80491
S° Bound: 7.271558

Extent Group 1 / Time Frame 1

CC ID: 469878
Time Frame Type: Range
Start: 2006
End: 2007

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Vector Representation 1

CC ID: 585412
Point Object Present?: Yes
Point Object Count: 623

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: 469880
Download URL:

Downloadable Data

File Type (Deprecated): ESRI Shapefile
Distribution Format: Shapefile



CC ID: 469869
URL Type:
Online Resource


CC ID: 469870
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 469897
Activity Date/Time: 2013-07-25

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 469896
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: 585410
Activity Date/Time: 2017-09-13

Partial upload of Spatial Info section only.

Activity Log 4

CC ID: 601253
Activity Date/Time: 2017-11-01

Replaced entire Lineage section to populate new Source Contribution field.

Activity Log 5

CC ID: 716694
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 geographic coordinate positions of 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 Coral 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 positional accuracy is determined by two tests producing circular RMS statistics. First, point GPS data were acquired by repeated occupation of a registered survey monument that has been recently recovered and positioned using survey grade GPS buy the National Geodetic Survey. Second, replicate GPS positions were collected after navigating to a way point by boat to estimate the positional error generated from variables due to environmental conditions offshore. The 95% sigma RMS accuracy error was calculated to be 0.97 meters and the precision calculated to be 0.84 meters on 141 measurements on registered monuments. The navigation accuracy error was calculated to be 1.36 meters with precision calculated to be 1.11 meters. Each GPS measurement was the average of 100 GPS positions. Thus, all point features in these accuracy assessment data meet the NOAA contract standard of 95% sigma of 5 meters.

Completeness Report:

Data are complete for the entire main archipelago of Palau. 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:

These data were objectively managed. They were with held from the photo interpreter during map making. The Coral Reef Assessment and Monitoring Program (CRAMP) of the Hawaii Institute of Marine Biology (HIMB) maintained these data at facilities other than ALH. Ultimately, these data were used to prepare the error matrix upon when the statistical report of the thematic accuracy of the maps was generated.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: 601255
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: 601254
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. The points were stratified on detailed class. | Type of Source Media: Software

Process Steps

Process Step 1

CC ID: 601256

After photo interpretation was completed, at minimum of 25 random geographically referenced points were acquired in each detailed benthic structure and cover class. This is done using a random point generator program obtained from the ESRI website, which generates random points inside an ArcView GIS polygon class. Waypoint files are generated from these random points and all waypoints, which could be safely accessed, are navigated to using a Trimble GeoExplorer 3 GPS data logger and a benthic habitat characterization was conducted. Eight test areas have been defined and the final data set meets the goal of 25 points per detailed structure and cover habitat.

Process Date/Time: 2007-01-01 00:00:00
Source: Random Point Generator

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity Palau_AA_Point_Data

Catalog Details

Catalog Item ID: 39423
GUID: gov.noaa.nmfs.inport:39423
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: 2023-10-17 16:12+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