Eelgrass distributions derived from a towed underwater video survey of the Nisqually River delta, 2012

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Andrew W. Stevens
Originator: Renee K. Takesue
Originator: Eric E. Grossman
Publication_Date: 20200721
Title:

Eelgrass distributions derived from a towed underwater video survey of the Nisqually River delta, 2012

Geospatial_Data_Presentation_Form: comma-delimited text
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9N9K2I1

Publication_Information:

Publication_Place:

Pacific Coastal and Marine Science Center, Santa Cruz, California

Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.5066/P9N9K2I1
Online_Linkage:

https://www.sciencebase.gov/catalog/item/5ebad8f082ce25b51361807a

Larger_Work_Citation:

Citation_Information:

Originator: Andrew W. Stevens
Originator: Renee K. Takesue
Originator: Eric E. Grossman
Publication_Date: 2020
Title:

Eelgrass distributions and bathymetry of the Nisqually River delta, Washington

Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9N9K2I1

Publication_Information:

Publication_Place:

Pacific Coastal and Marine Science Center, Santa Cruz, California

Publisher: U.S. Geological Survey

Online_Linkage: https://doi.org/10.5066/P9N9K2I1

Description:

Abstract:

This portion of the USGS data release presents eelgrass distributions derived from towed underwater video surveys of the Nisqually River delta, Washington in 2012 (USGS Field Activity Number D-01-12-PS). Eelgrass data were collected from the R/V George Davidson equipped with a towed underwater video system and global navigation satellite system (GNSS) receiver. The underwater video system consisted of a Splashcam standard definition video camera connected to a Sony GV-D1000 video monitor and tape recorder. Positioning of the survey vessel was determined at 1 Hz intervals using a Trimble R7 GNSS receiver and Trimble Zephyr Model 2 antenna. The positioning data from the GNSS were encoded onto the audio track of the digital video recording using Red Hen Systems (RHS) VMS200 hardware. Underwater video data were recorded as the vessel navigated along a series of shore-perpendicular transects at speeds between 1 and 2 knots. The underwater video recording was later reviewed and the presence or absence of eelgrass was determined for each 1-s segment of video tape. These data were used to evaluate the classification of single-beam sonar data acquired during the same time period.

Purpose:

Data were obtained to document interannual changes in eelgrass distributions following the removal of a dike that restored tidal processes to over 300 ha of former freshwater wetlands on the Nisqually River delta in 2009. These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to identify distributions of eelgrass.

Supplemental_Information:

Additional information about the field activities from which these data were derived are available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=D0112PS
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20120219
Ending_Date: 20120219

Currentness_Reference: ground condition at time data were collected

Status:

Progress: Complete
Maintenance_and_Update_Frequency: Not planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -122.7510110
East_Bounding_Coordinate: -122.6826760
North_Bounding_Coordinate: 47.1199380
South_Bounding_Coordinate: 47.1069810

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:5ebad8f082ce25b51361807a

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: aquatic vegetation
Theme_Keyword: sea-floor characteristics
Theme_Keyword: GPS measurement
Theme_Keyword: underwater photography

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: biota

Theme:

Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Flora

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: video observation

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: Pacific Coastal and Marine Science Center
Theme_Keyword: PCMSC
Theme_Keyword: USGS Coastal Habitats in Puget Sound Project (CHIPS)

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Salish Sea
Place_Keyword: Puget Sound
Place_Keyword: Pierce County
Place_Keyword: Thurston County
Place_Keyword: Nisqually River
Place_Keyword: Billy Frank Jr Nisqually National Wildlife Refuge

Access_Constraints: none
Use_Constraints:

USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigational purposes.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: PCMSC Science Data Coordinator
Contact_Organization:

U.S. Geological Survey, Pacific Coastal and Marine Science Center

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Native_Data_Set_Environment: MATLAB Version: 9.6.0.1214997 (R2019a)
Cross_Reference:

Citation_Information:

Originator: Ann Gibbs
Originator: Eric Grossman
Originator: Bruce Richmond
Publication_Date: 2005
Title:

Summary and preliminary interpretations of USGS cruise A-2-02-HW: Underwater video surveys collected off of Oahu, Molokai, and Maui, Hawaii June-July 2002

Geospatial_Data_Presentation_Form: comma-delimited text
Publication_Information:

Publication_Place: Reston, VA
Publisher: U.S. Geological Survey

Online_Linkage: https://pubs.usgs.gov/of/2005/1244/

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted.

Logical_Consistency_Report: All data falls within expected ranges.
Completeness_Report:

Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Positioning of the survey vessel was achieved with a global navigation satellite system (GNSS) differentially corrected with data from a single GNSS base station. The average estimated horizontal accuracy of the GNSS-derived vessel positions is 5 cm. However, horizontal offsets between the underwater video camera and the shipboard GNSS antenna, or layback, was observed during data collection. The layback of the video camera is estimated to be no greater than 15 m based on calculations for a similar camera system given in Gibbs and others, 2005.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: No formal positional accuracy tests were conducted

Lineage:

Process_Step:

Process_Description:

Eelgrass distribution data were collected from the R/V George Davidson equipped with a towed underwater video system and global navigation satellite system (GNSS) receiver. The underwater video system consisted of a Splashcam standard definition video camera connected to a Sony GV-D1000 video monitor and tape recorder. Positioning of the survey vessel was determined at 1-Hz intervals using a Trimble R7 GNSS receiver and Trimble Zephyr Model 2 antenna. The positioning data from the GNSS were encoded onto the audio track of the digital video recording using Red Hen Systems (RHS) VMS200 hardware. Underwater video data were recorded as the vessel navigated along a series of shore-perpendicular transects at speeds between 1 and 2 knots.

Process_Date: 20120219

Process_Step:

Process_Description:

The underwater video recording was reviewed and the presence or absence of eelgrass was determined for each 1-s segment of video tape. All available eelgrass distribution data from the survey were compiled into a comma-delimited text file for distribution.

Process_Date: 20200512

Process_Step:

Process_Description:

Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.

Process_Date: 20201019
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross

Contact_Position: Marine Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598

Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 2810

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0000001
Longitude_Resolution: 0.0000001
Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS_1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.01
Altitude_Distance_Units: meters
Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Attribute Table
Entity_Type_Definition:

Table containing attribute information associated with the dataset

Entity_Type_Definition_Source: Producer defined

Attribute:

Attribute_Label: datetime_utc
Attribute_Definition:

The date and time of data collection in Coordinated Universal Time (UTC).

Attribute_Definition_Source: Producer Defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 2012-02-19 18:41:53
Range_Domain_Maximum: 2012-02-19 23:34:30
Attribute_Units_of_Measure: date and time in yyyy-mmm-dd HH:MM:SS format

Attribute:

Attribute_Label: longitude
Attribute_Definition:

Longitude coordinate of data point relative to the North American Datum of 1983