Bathymetric measurements of Little Holland Tract, Sacramento-San Joaquin Delta, California, 2015, from personal watercraft

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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: Alexander G. Snyder
Originator: Andrew W. Stevens
Originator: Emily Carlson
Originator: Jessica R. Lacy
Publication_Date: 2016
Title:

Bathymetric measurements of Little Holland Tract, Sacramento-San Joaquin Delta, California, 2015, from personal watercraft

Geospatial_Data_Presentation_Form: comma-delimited text and shapefile
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/F7RX9954

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/F7RX9954
Online_Linkage:

https://www.sciencebase.gov/catalog/item/56671eb2e4b06a3ea36c8bf2

Larger_Work_Citation:

Citation_Information:

Originator: Alexander G. Snyder
Originator: Andrew W. Stevens
Originator: Emily Carlson
Originator: Jessica R. Lacy
Publication_Date: 2016
Title:

Digital elevation model of Little Holland Tract, Sacramento-San Joaquin Delta, California, 2015

Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/F7RX9954

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/F7RX9954

Description:

Abstract:

Bathymetric data were collected by the U.S. Geological Survey (USGS) in 2015 for Little Holland Tract in the Sacramento-San Joaquin River Delta, California. The data were collected using a personal watercraft (PWC) platform that consisted of Trimble R7 Global Navigation Satellite System (GNSS) receivers with Zephyr 2 antennas, combined with Odom Echotrac CV-100 single-beam echosounders and 200 kHz transducers. Data was post-processed to remove spurious data points. Raw depths were converted to ellipsoid elevations in the data acquisition software. Orthometric elevations relative to NAVD88 were computed using National Geodetic Survey Geoid12a offsets, and the final data were projected in Cartesian coordinates using the UTM Zone 10 North (meters) (NAD83[2011]) coordinate system. The mean estimated vertical uncertainty of the 2015 USGS PWC survey is 6.1 cm.

Purpose:

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 bathymetric features.

Supplemental_Information:

Additional information about the field activities from which these data were derived are available online at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2015-642-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.

Time_Period_of_Content:

Time_Period_Information:

Multiple_Dates/Times:

Single_Date/Time:

Calendar_Date: 20150608

Single_Date/Time:

Calendar_Date: 20150619

Currentness_Reference: ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -121.667629767
East_Bounding_Coordinate: -121.648939185
North_Bounding_Coordinate: 38.350195381
South_Bounding_Coordinate: 38.28554843

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:56671eb2e4b06a3ea36c8bf2

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: bathymetry
Theme_Keyword: bathymetry measurement
Theme_Keyword: GPS measurement

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation

Theme:

Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Bathymetry and Elevation

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: single-beam echo sounder
Theme_Keyword: Global Positioning System (GPS) observations

Theme:

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

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Sacramento-San Joaquin Delta
Place_Keyword: Little Holland Tract
Place_Keyword: Yolo County
Place_Keyword: Solano County
Place_Keyword: Liberty Island
Place_Keyword: Sacramento River Deep Water Ship Channel

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_Organization_Primary:

Contact_Organization:

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

Contact_Person: PCMSC Science Data Coordinator

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: US

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

Native_Data_Set_Environment:

Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.2 (Build 3552) Service Pack N/A (Build N/A)

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The uncertainty associated with positioning of the survey platforms was estimated by computing the standard deviations of the GNSS rover positions relative to the base station using Waypoint Grafnav (version 8.50). Depths measured using sonar are subject to additional sources of uncertainty including fluctuations in the speed of sound and from the pitch and roll of the survey vessels. Given the relatively calm water surface and low range of water depth present in this survey, we estimate depth sounding uncertainty to be 1 percent of the water depth.

Logical_Consistency_Report:

Data fall within expected ranges, efforts were made during digital elevation modeling to best represent reality.

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:

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

The uncertainty associated with positioning of the survey platforms was estimated by computing the standard deviations of the GNSS rover positions relative to the base station using Waypoint Grafnav (version 5.0). Based on these calculations, the mean vertical accuracy of GNSS positions at the 95 percent confidence interval (1.96 times the standard deviations assuming a normal distribution) were calculated. Depths measured using sonar are subject to additional sources of uncertainty including fluctuations in the speed of sound and from the pitch and roll of the survey vessels. Given the relatively calm water surface and low range of water depth present in this survey, we estimate depth sounding uncertainty to be 1 percent of the water depth. The mean estimated vertical uncertainty is 6.1 cm.

Lineage:

Process_Step:

Process_Description:

Bathymetric data were collected primarily using two personal watercraft (PWC), equipped with single-beam echosounders and dual-frequency global navigation satellite systems (GNSS) receivers. The sonar systems consisted of Odom Echotrac CV-100 single-beam echosounders and 200 kHz transducers with 9-degree beam angles that digitize depth returns at a resolution of 1.25 cm. Positioning of the survey vessels was determined at 10-Hz using Trimble R7 GNSS receivers with Zephyr 2 antennas operating in autonomous mode. Output from the GNSS and sonar systems were combined in real time on the PWC by a computer running HYPACK (version 13.0.0.6) hydrographic survey software. Navigation and data quality information were displayed on a video monitor, allowing PWC operators to navigate along survey lines at speeds of 2 to 3 meters per second. Depths from the echosounders were computed using a sound velocity of 1488.80 meters per second, measured during the survey with a YSI Castaway CTD. Digitized depths were compared to the raw acoustic backscatter signal using a Graphical User Interface (GUI) programmed using the computer program Matlab to ensure the accuracy of depths produced by the echosounder. In areas where the automated echosounder signal processing failed (typical in very shallow regions), the GUI was used to digitize the bottom by hand. Once the raw depths were adjusted, a running mean with a window length of 5 points (approximately 1 m distance) was used to remove high-frequency vertical fluctuations, such as those caused by pitch and roll of the survey vessels.

Process_Date: 20150608

Process_Step:

Process_Description: Data collection using same methods as above.
Process_Date: 20150619

Process_Step:

Process_Description:

Survey-grade positioning of the PWCs were obtained using a post-processed kinematic (PPK) methodology, whereby Waypoint Grafnav (version 8.50) was used to make differential corrections referenced to a single base station described in the previous section. The post-processed positioning data were then merged with sonar depths to determine the elevation of the bed. Orthometric elevations relative to NAVD88 were computed using the National Geodetic Survey Geoid12a, and the final data were projected in Cartesian coordinates using the UTM Zone 10 North (meters) coordinate system.

Process_Date: 201506

Process_Step:

Process_Description: All data were compiled into a single shapefile.
Process_Date: 20151117

Process_Step:

Process_Description:

Edits were made as needed to bring the metadata up to current PCMSC standards including standardizing doi# links, correcting typos, adding disclaimers, and refining keywords. Point of Contact and Metadata Contact information sections were changed to static PCMSC contact information. No data were changed. Users are advised to compare the metadata date of this file to any similar file to ensure they are using the most recent version.

Process_Date: 2020710
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Susan A Cochran
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
Country: United States

Contact_Voice_Telephone: 831-460-7545
Contact_Electronic_Mail_Address: scochran@usgs.gov

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: Entity point
Point_and_Vector_Object_Count: 652120

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: -123.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000.0
False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:

Abscissa_Resolution: 0.6096
Ordinate_Resolution: 0.6096

Planar_Distance_Units: Meter

Geodetic_Model:

Horizontal_Datum_Name: D_North_American_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: Attribute Table
Entity_Type_Definition:

Table containing attribute information associated with the data set.

Entity_Type_Definition_Source: Producer defined

Attribute:

Attribute_Label: Date_Time
Attribute_Definition:

Date and time that data point was collected in local Pacific Standard Time, yyy-mm-dd hh:mm:ss.sss.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Unrepresentable_Domain: Unknown

Attribute:

Attribute_Label: Longitude
Attribute_Definition: Longitude coordinate of data point (NAD83 (2011)).
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 121.64894
Range_Domain_Maximum: 121.667058
Attribute_Units_of_Measure: Decimal Degrees

Attribute:

Attribute_Label: Latitude
Attribute_Definition: Latitude coordinate of data point (NAD83 (2011)).
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 38.285711
Range_Domain_Maximum: 38.350002
Attribute_Units_of_Measure: Decimal Degrees

Attribute:

Attribute_Label: Easting_m
Attribute_Definition:

Easting projected coordinate of data point - NAD83(2011), UTM Zone 10.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 616525.65
Range_Domain_Maximum: 618056.1
Attribute_Units_of_Measure: Meters

Attribute:

Attribute_Label: Northing_m
Attribute_Definition:

Northing projected coordinate of data point - NAD83(2011), UTM Zone 10.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 4238359.71
Range_Domain_Maximum: 4245512.56
Attribute_Units_of_Measure: Meters

Attribute:

Attribute_Label: Ellip_Ht_m
Attribute_Definition: Height of data point with reference to the ellipsoid.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -290.29
Range_Domain_Maximum: 220.24

Attribute:

Attribute_Label: Ortho_Ht_m
Attribute_Definition: Elevation with reference to Geoid 12A.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -9.8
Range_Domain_Maximum: 1.03
Attribute_Units_of_Measure: Meters

Attribute:

Attribute_Label: Hor_Acc_m
Attribute_Definition:

The uncertainty associated with positioning of the survey platforms, estimated by computing the standard deviations of the GNSS rover positions relative to the base station using Waypoint Grafnav.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.02
Range_Domain_Maximum: 33.01
Attribute_Units_of_Measure: Meters

Attribute:

Attribute_Label: Vert_Acc_m
Attribute_Definition:

The uncertainty associated with positioning of the survey platforms, estimated by computing the standard deviations of the GNSS rover positions relative to the base station using Waypoint Grafnav.

Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.03
Range_Domain_Maximum: 41.37
Attribute_Units_of_Measure: Meters

Overview_Description:

Entity_and_Attribute_Overview:

The entity and attribute information provided here describes the tabular data associated with the data set. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the data set.

Entity_and_Attribute_Detail_Citation:

The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey - Science Base

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

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

Resource_Description:

Bathymetry data are available as both a comma-delimited text file and a shapefile, and include the associated 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. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Shapefile and comma-delimited text
Transfer_Size: 28.5

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://www.sciencebase.gov/catalog/file/get/56671eb2e4b06a3ea36c8bf2

Network_Resource_Name: https://doi.org/10.5066/F7RX9954

Access_Instructions:

Data can be downloaded using the Network Resource links. The first link will begin a direct download of the data. The second link points to the landing page for the entire data release.

Fees: None.

Metadata_Reference_Information:

Metadata_Date: 20201019
Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

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

Contact_Person: PCMSC Science Data Coordinator

Contact_Address:

Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: US

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_F7RX9954/LHT15_PWCsonar_FGDC.html>