Acoustic-backscatter data from Floras Lake, Oregon, June 2018

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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: SeanPaul M. La Selle
Originator: Andrew W. Stevens
Originator: Brandon M. Nasr
Publication_Date: 20230213
Title: Acoustic-backscatter data from Floras Lake, Oregon, June 2018
Geospatial_Data_Presentation_Form: GeoTIFF
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9FQQ5JN

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/P9FQQ5JN
Online_Linkage:

https://www.sciencebase.gov/catalog/item/5e8bcdb082cee42d13444321

Larger_Work_Citation:

Citation_Information:

Originator: SeanPaul M. La Selle
Originator: Andrew W. Stevens
Originator: Brandon M. Nasr
Publication_Date: 2023
Title:

Bathymetry and acoustic backscatter data from Floras Lake, Oregon, June 2018

Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9FQQ5JN

Publication_Information:

Publication_Place: Santa Cruz, CA
Publisher: U.S. Geological Survey

Description:

Abstract:

This portion of the USGS data release presents acoustic-backscatter data collected during surveys performed in Floras Lake, Oregon in June 2018 (USGS Field Activity Number 2018-636-FA). Lake bed backscatter data were collected using a personal watercraft (PWC) equipped with a sidescan sonar system and global navigation satellite system (GNSS) receivers. The sonar system consisted of a Tritech Starfish 990F with a 1-MHz transducer and a 0.3-degree horizontal beam width. Output from the GNSS receivers and sonar system were combined in real time on the PWC by a computer running HYPACK hydrographic survey software. Navigation information was displayed on a video monitor, allowing PWC operators to navigate along survey lines at speeds of 2 to 3 m/s. Survey-grade positions of the PWCs were achieved with a single-base station and differential post-processing. Positioning data from the GNSS receivers were post-processed using Waypoint Grafnav to apply differential corrections from a GNSS base station with known horizontal and vertical coordinates relative to the North American Datum of 1983.

Purpose:

Data were obtained to document the surface characteristics of the lakebed in Floras Lake, Oregon and were collected to inform vibracoring efforts. 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 topographic and lake bathymetric features.

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=2018-636-FA
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: 20180619
Ending_Date: 20180620

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: -124.5099660
East_Bounding_Coordinate: -124.4960940
North_Bounding_Coordinate: 42.9029970
South_Bounding_Coordinate: 42.8841060

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: GPS measurement
Theme_Keyword: lakebed characteristics
Theme_Keyword: lakebed acoustic reflectivity

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation

Theme:

Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: substrate

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: lake bed
Theme_Keyword: Global Positioning System (GPS) observations

Theme:

Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
Theme_Keyword: GPS (Global Positioning System)
Theme_Keyword: Echo Sounders

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:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:5e8bcdb082cee42d13444321

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: State of Oregon
Place_Keyword: Curry County
Place_Keyword: Cape Blanco
Place_Keyword: Floras Lake

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: SonarWiz (version 6) and Python 3.7 on a Windows 10 computer

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted.

Logical_Consistency_Report: All data fall 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:

Survey-grade positions of the personal watercraft (PWCs) were achieved with global navigation satellite system (GNSS) receivers and a single GNSS base station placed on a benchmark coordinates relative to the North American Datum of 1983. The position and elevation of the benchmark were derived from two static GNSS occupations on June 19 and 20, 2018, with durations of 7 and 6 hours, respectively. The equipment for the static occupations consisted of a Trimble R10 GNSS receiver and fixed-height tripod. The static observations were processed using the National Geodetic Survey Online Positioning User Service (OPUS). The processed positions from each occupation were averaged to attain the final coordinates of the benchmark with an average horizontal accuracy of 1 cm. Positioning data from the PWCs were post-processed using Waypoint Grafnav software to apply differential corrections from the GNSS base station. Manufacturer reported accuracy for the differentially corrected horizontal positions for the GNSS rover trajectories is 0.8 cm + 0.5 ppm. Baselines from the GNSS base station varied between 100 m and 2.5 km with a mean of 1 km, suggesting the average horizontal accuracy of survey vessel positions to be about 1 cm. Combining the uncertainty in the benchmark and watercraft yields a total uncertainty of 2 cm. Uncertainty in the horizontal positions associated with pitch and roll of the survey vessels is unknown. Accuracies of final products may be lower due to total propagated uncertainties of the mapping systems, which include sonar system, GNSS system, and navigation, as well as data processing that includes sounding cleaning, and gridding.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: Not applicable to acoustic-backscatter data

Lineage:

Process_Step:

Process_Description:

Acoustic-backscatter data were collected on June 20, 2018, using a sidescan sonar system and global navigation satellite systems (GNSS) receivers mounted on personal watercraft (PWC). The sonar system consisted of a Tritech Starfish 990F sidescan sonar system with a 1-MHz transducer and a 0.3-degree horizontal beam width. Positioning of the survey vessels was determined at 10 Hz using survey-grade GNSS receivers. Output from the GNSS receivers and sonar systems were combined in real time on the PWC by a computer running HYPACK hydrographic survey software. Navigation information was displayed on a video monitor, allowing PWC operators to navigate along survey lines at speeds of 2 to 3 m/s.

Process_Date: 20180620

Process_Step:

Process_Description:

Survey-grade positions of the PWCs were achieved with a single-base station and differential post-processing. Positioning data from the GNSS receivers were post-processed using Waypoint Grafnav to apply differential corrections from a GNSS base station with known horizontal and vertical coordinates relative to the North American Datum of 1983. Acoustic-backscatter data were merged with post-processed positioning data, and backscatter files were adjusted to minimize the effect of aquatic vegetation, and spurious soundings were removed using SonarWiz software (version 6). Processed backscatter grids were exported as a GeoTIFF and projected in cartesian coordinates using the Universal Transverse Mercator (UTM), Zone 10 North, meters coordinate system.

Process_Date: 20180621

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:

UTM_Zone_Number: 10
Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -123.00000
Latitude_of_Projection_Origin: 0.00000
False_Easting: 500000.0
False_Northing: 0.00

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:

Abscissa_Resolution: 1.0
Ordinate_Resolution: 1.0

Planar_Distance_Units: Meters

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

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: value
Entity_Type_Definition: backscatter intensity as a digital number
Entity_Type_Definition_Source: Producer defined

Overview_Description:

Entity_and_Attribute_Overview:

The complete 0.5-m resolution 2018 Floras Lake backscatter grid was originally archived as a TIFF image with the following attributes.

Cell size = 0.5
Number of rows = 7217
Number of columns = 4005

Data type = floating point
NO_DATA_VALUE = -999

Boundary
Xmin = 375523.75
Xmax = 379132.25
Ymin = 4749038.75
Ymax = 4751041.25

Statistics
Minimum value = 6.6
Maximum value = 102.5
Mean = 36.7
Standard deviation = 5.2

Coordinate system description
Projection  UTM
Zone  10
Datum  NAD83
Units  meter

Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: U.S. Geological Survey - Science Base
Contact_Organization: U.S. Geological Survey

Contact_Address:

Address_Type: mailing and physical
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: USA

Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov

Resource_Description:

These data are available in GeoTIFF format, including a tif world file (.tfw) and CSDGM FGDC-compliant metadata.

Distribution_Liability:

Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: GeoTIFF
Format_Version_Number: ArcMap (version 10.3.1)
Format_Information_Content:

Downloadable zip file contains the TIFF (.tif) version of the backscatter data and a projection file (.tfw).

File_Decompression_Technique: Zip
Transfer_Size: 12.72

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/5e8bcdb082cee42d13444321

Network_Resource_Name:

https://www.sciencebase.gov/catalog/item/5e8bcdb082cee42d13444321

Network_Resource_Name: https://doi.org/10.5066/P9FQQ5JN

Access_Instructions:

Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to begin a download of the backscatter data and associated files. The second link points to a landing page with backscatter data and associated files. The third link points to a landing page for the entire data release.

Fees: None

Metadata_Reference_Information:

Metadata_Date: 20230213
Metadata_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 St.
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060

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

Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P9FQQ5JN/floras18_backscatter_metadata.html>