St. John Shallow Water Accuracy Assessment Transects

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Laurie Bauer, NOAA/NOS/NCCOS/CCMA Biogeography Branch
Publication_Date: 2009
Title: St. John Shallow Water Accuracy Assessment Transects
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Silver Spring, MD
Publisher:
NOAA's Ocean Service, National Centers for Coastal Ocean Science (NCCOS)
Other_Citation_Details:
Please use citation for the written document "Benthic Habitats of St. John, U.S. Virgin Islands" when using these data.
Online_Linkage: <http://ccma.nos.noaa.gov/ecosystems/coralreef/benthic/>
Larger_Work_Citation:
Citation_Information:
Originator:
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 Program
Publication_Date: 2009
Title: Benthic Habitats of St. John, U.S. Virgin Islands
Geospatial_Data_Presentation_Form: document
Publication_Information:
Publication_Place: Silver Spring, MD
Publisher: NOAA National Centers for Coastal Ocean Science
Other_Citation_Details:
Zitello, A.G., L.J. Bauer, T.A. Battista, P.W. Mueller and M.S. Kendall. 2009. Benthic Habitats of St. John, U.S. Virgin Islands. NOAA Technical Memorandum NOS NCCOS 96. 50 pp.
Description:
Abstract:
Benthic habitat maps of the nearshore marine environment of St. John, U.S. Virgin Islands were created by visual interpretation of remotely sensed imagery. The objective of this effort, conducted by NOAA's Center for Coastal Monitoring and Assessment - Biogeography Branch in partnership with the U.S. National Park Service (NPS), was to provide spatially-explicit information on the habitat types, biological cover and live coral cover of St. John's coral reef ecosystem. The data described herein represent accuracy assessment (AA) sites explored by NOAA field scientists to evaluate the thematic accuracy of the benthic habitat maps of St. John. Considering vessel drift during habitat characterization, the entire evaluation period was most accurately represented by a series of GPS points logged at five-second intervals.
Purpose:
The purpose of this survey data was to collect information on current habitat conditions at random locations throughout the mapping area. Locations were determined by an iterative, GIS-based, stratified random sampling technique to ensure that all bottom classifications would be assessed. This information was used to evaluate the thematic accuracy of the St. John benthic habitat map.
Supplemental_Information:
Data were collected on 486 ground validation sites over a two-week field mission from February 9-20, 2009 aboard U.S. National Park Service small research vessels. As anchoring at each site was not feasible for rapid assessment, wind and wave effects caused the survey vessel to drift along a transect. Post-processing of the GPS data allowed for a series of points to represent the actual survey location.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20090209
Ending_Date: 20090220
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -64.839479
East_Bounding_Coordinate: -64.645648
North_Bounding_Coordinate: 18.374291
South_Bounding_Coordinate: 18.297031
Keywords:
Theme:
Theme_Keyword_Thesaurus: CoRIS Theme Thesaurus
Theme_Keyword: EARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic Habitat
Theme:
Theme_Keyword_Thesaurus: CoRIS Discovery Thesaurus
Theme_Keyword: Geographic Information > Habitats
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: coral reef
Theme_Keyword: benthic habitats
Theme_Keyword: reef
Theme_Keyword: submerged aquatic vegetation
Theme_Keyword: unconsolidated sediments
Theme_Keyword: zone
Theme_Keyword: geomorphological structure
Theme_Keyword: biological cover
Theme_Keyword: accuracy assessment
Theme_Keyword: transect
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: environment
Theme_Keyword: 007
Theme_Keyword: imageryBaseMapsEarthCover
Theme_Keyword: 010
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: United States
Place_Keyword: U. S. Virgin Islands
Place_Keyword: St. John
Place:
Place_Keyword_Thesaurus: CoRIS Place Thesaurus
Place_Keyword:
COUNTRY/TERRITORY > United States of America > U. S. Virgin Islands > St. John > St. John (18N064W0011)
Place_Keyword:
OCEAN BASIN > Atlantic Ocean > Caribbean Sea > Virgin Islands > Virgin Islands > St. John (18N064W0011)
Place:
Place_Keyword_Thesaurus: CoRIS Region
Place_Keyword: USVI
Access_Constraints: None
Use_Constraints: Not for navigation.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Tim Battista
Contact_Organization: NOAA National Ocean Service
Contact_Position: Researcher
Contact_Address:
Address_Type: mailing and physical
Address: 1305 East West Highway
City: Silver Spring
State_or_Province: MD
Postal_Code: 20910
Country: USA
Contact_Voice_Telephone: (301) 713-3028 x171
Contact_Facsimile_Telephone: (301) 713-4388
Contact_Electronic_Mail_Address: Tim.Battista@noaa.gov
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.0.1770

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The points in this data layer were acquired by GPS data using a Trimble GeoXT receiver. All data point characteristics were recorded in the GPS data logger automatically and seamlessly transferred to ArcGIS shapefiles using Trimble Pathfinder Office software. Attributes are all expected to be correct.
Logical_Consistency_Report:
Data points were collected with mapping-grade GPS receivers. The data were post processed for differential correction to the Continually Operating Reference System (CORS) station at St. Thomas, U.S. Virgin Islands (VITH).

All attribute information was recorded by the GPS receiver and stored directly in the raw GPS files. This automated process was assumed to be error free. This file is believed to be logically consistent.

Completeness_Report:
486 field positions were occupied and habitat characterizations were conducted for accuracy assessment during this work. A small subset of the accuracy assessment sites did not have transect information in this dataset, depending on the evaluation technique. Snorkel and visual inspection from distances did not allow for a GPS receiver to occupy the exact location, as a result, approximated GPS locations were used instead without the opportunity for transects with the underwater camera.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The true positional accuracy of individual epics was determined to be within 1 m for 96% of the logged points. However, it is estimated that horizontal accuracies may be 0 - 20m from the true position of the underwater camera assessment due to line "lay-back" during drift.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: NOAA
Publication_Date: 2009
Title: GPS data
Type_of_Source_Media: GPS data
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2009
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: Trimble SSF files
Source_Contribution:
GPS data, which were originally recorded as code-phase signals in Trimble SSF format, were differentially post-processed to the Continually Operating Reference System (CORS) station at St. Thomas, U.S. Virgin Islands (VITH).
Process_Step:
Process_Description:
A benthic habitat map was generated from delineating features by visual inspection of remotely sensed imagery and incorporation of field data acquired during a ground validation mission. Target locations for the accuracy assessment of this habitat map were determined by an iterative, GIS-based, stratified random sampling technique to ensure that all bottom classifications would be assessed. Based on guidelines from other recent accuracy assessment analyses (Battista et al. 2007), a minimum of 25 points were assigned to each of the 13 detailed structure classes within the draft habitat map. An additional 175 points were distributed based on the proportion of area of each structure class in the map. Points were randomly placed within each class using Hawth's Analysis Tools (Beyer 2004) in ArcGIS at a minimum distance of 50 m apart. Next, the number of points that fell within each detailed primary cover class was calculated. Where necessary, additional points were randomly added and re-distributed from classes with many points to ensure that there was a minimum of 25 points within each detailed cover class.

Process Dates: 2008-2009

Process_Date: 2009
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Laurie Bauer
Contact_Organization: NOAA/NOS/NCCOS/CCMA Biogeography Branch
Contact_Address:
Address_Type: physical address
Address: 1305 East West Highway
City: Silver Spring
State_or_Province: MD
Postal_Code: 20910
Country: U.S.A.
Contact_Voice_Telephone: (301) 713 - 3028
Process_Step:
Process_Description:
NOAA field scientists explored the accuracy assessment locations with a suite of assessment techniques depending on the conditions at each site. A combination of underwater video (primary method), free diving, snorkeling and surface observations were used to survey the ecological characteristics at each location.

At the start of every morning, the boat captain selected a general region to begin the day's work. Navigating to field locations was accomplished using a Garmin GPS 76 device with the uploaded GV site coordinates. The boat captain maneuvered the vessel to within 5 m of the target location and made every effort to maintain that location without jeopardizing crew and equipment safety. Once on site, NOAA scientists would simultaneously deploy a SeaViewer Sea-Drop 950 camera and begin logging a waypoint on a Trimble GeoXT GPS receiver.While the video camera was capturing bottom imagery, an observer viewed the video real-time on a Panasonic Toughbook aboard the survey vessel. They categorized each site according to the levels of the habitat classification scheme: major and detailed geomorphological structure, major biological cover, percent major biological cover and percent coral cover. Data was entered into a custom data dictionary generated in Trimble Pathfinder Office software and loaded onto the Trimble data logger.

Process_Date: 2009
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Laurie Bauer
Contact_Organization: NOAA/NOS/NCCOS/CCMA Biogeography Branch
Contact_Address:
Address_Type: physical address
Address: 1305 East West Highway
City: Silver Spring
State_or_Province: MD
Postal_Code: 20910
Country: U.S.A.
Contact_Voice_Telephone: (301) 713 - 3028
Process_Step:
Process_Description:
Trimble Pathfinder Office software was used to post process and differentially correct the raw GPS data to the Continually Operating Reference System (CORS) station at St. Thomas, U.S. Virgin Islands (VITH). All positions acquired for a single site were plotted to represent the entire duration of bottom evaluation as the boat drifted.
Process_Date: 2009
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Tim Battista
Contact_Organization: NOAA National Ocean Service
Contact_Position: Researcher
Contact_Address:
Address_Type: mailing and physical
Address: 1305 East West Highway
City: Silver Spring
State_or_Province: MD
Postal_Code: 20910
Country: USA
Contact_Voice_Telephone: (301) 713-3028 x171
Contact_Facsimile_Telephone: (301) 713-4388
Contact_Electronic_Mail_Address: Tim.Battista@noaa.gov
Process_Step:
Process_Description:
Ultimately, precisely positioned GPS positions, the evaluation transect and the associated classification data were viewed in a GIS to assess the accuracy of the draft benthic habitat map.
Process_Date: 2009
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Laurie Bauer
Contact_Organization: NOAA/NOS/NCCOS/CCMA Biogeography Branch
Contact_Address:
Address_Type: physical address
Address: 1305 East West Highway
City: Silver Spring
State_or_Province: MD
Postal_Code: 20910
Country: U.S.A.
Contact_Voice_Telephone: (301) 713 - 3028

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Entity Point
Point_and_Vector_Object_Count: 5785

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 20
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -63.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Coordinate Pair
Coordinate_Representation:
Abscissa_Resolution: 0.000001
Ordinate_Resolution: 0.000001
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257224

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: St. John Accuracy Assessment Transects
Entity_Type_Definition: Shapefile attribute table
Entity_Type_Definition_Source: None
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: Max_PDOP
Attribute_Definition: Maximum Positional Dilution of Precision
Attribute_Definition_Source: Automatically generated by Trimble
Attribute_Domain_Values:
Unrepresentable_Domain: Unknown
Attribute:
Attribute_Label: Max_HDOP
Attribute_Definition: Maximum Horizontal Dilution of Precision
Attribute_Definition_Source: Automatically generated by Trimble
Attribute_Domain_Values:
Unrepresentable_Domain: Unknown
Attribute:
Attribute_Label: GPS_Date
Attribute_Definition: Date of logged position
Attribute_Definition_Source: Automatically generated by Trimble
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2009 February 9
Range_Domain_Maximum: 2009 February 20
Attribute:
Attribute_Label: GPS_Time
Attribute_Definition: Time of logged position
Attribute_Definition_Source: Automatically generated by Trimble
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 06:00:00am
Range_Domain_Maximum: 06:00:00pm
Attribute:
Attribute_Label: Vert_Prec
Attribute_Definition: Vertical Precision
Attribute_Definition_Source: Automatically generated by Trimble
Attribute_Domain_Values:
Unrepresentable_Domain: in meters
Attribute:
Attribute_Label: Horz_Prec
Attribute_Definition: Hortizontal Precision
Attribute_Definition_Source: Automatically generated by Trimble
Attribute_Domain_Values:
Unrepresentable_Domain: in meters

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
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 Program
Contact_Address:
Address_Type: mailing and physical address
Address: 1305 East West Highway
City: Silver Spring
State_or_Province: MD
Postal_Code: 20910
Contact_Voice_Telephone: 301-713-3028 x171
Contact_Facsimile_Telephone: 301-713-4384
Contact_Electronic_Mail_Address: tim.battista@noaa.gov
Hours_of_Service: 0800 - 1700, Monday to Friday, EST
Resource_Description: Downloadable Data
Distribution_Liability:
The National Oceanic and Atmospheric Administration (NOAA) National Centers for Coastal Ocean Science (NCCOS) is publishing this data on their website. NCCOS Biogeography Branch does not guarantee the accuracy of the geographic features or attributes. Please see the written report and metadata records for each data set for complete information on the source, limitations, and proper use.
Custom_Order_Process: Contact NOAA for distribution options (see Distributor).

Metadata_Reference_Information:
Metadata_Date: 20121220
Metadata_Review_Date: 20100315
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
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
Contact_Position: Primary Map Creator
Contact_Address:
Address_Type: mailing and physical address
Address: 1305 East West Highway
City: Silver Spring
State_or_Province: MD
Postal_Code: 20910
Contact_Voice_Telephone: 301-713-3028
Contact_Facsimile_Telephone: 301-713-4384
Hours_of_Service: 0800 - 1700, Monday to Friday, EST
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: Local Time

CoRIS:
CoRIS_ID: 20100315011208
CoRIS_Children: None
CoRIS_Beginning_Date: 20090209
CoRIS_Ending_Date: 20090220
CoRIS_Metadata_Link:
<http://www.coris.noaa.gov/metadata/records/html/metadata_aa_data_shallowwater_transects.html>
CoRIS_Tracking_ID: 4507

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