Topographic survey data of Oxbow Reservoir, Placer County, California, October 2022

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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: Joshua B. Logan
Originator: Amy E. East
Publication_Date: 20231030
Title:

Topographic survey data of Oxbow Reservoir, Placer County, California, October 2022

Geospatial_Data_Presentation_Form: comma-delimited text
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9B39W4J

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/P9B39W4J
Online_Linkage:

https://www.sciencebase.gov/catalog/item/65135fb4d34eeedefc13c1fc

Larger_Work_Citation:

Citation_Information:

Originator: Joshua B. Logan
Originator: Amy E. East
Publication_Date: 2023
Title:

Topographic survey data and digital elevation model of Oxbow Reservoir, Placer County, California, October 2022

Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P9B39W4J

Publication_Information:

Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA
Publisher: U.S. Geological Survey

Other_Citation_Details:

Suggested Citation: Logan, J.B. and East, A.E., 2023, Topographic survey data and digital elevation model of Oxbow Reservoir, Placer County, California, October 2022: U.S. Geological Survey data release, https://doi.org/10.5066/P9B39W4J.

Online_Linkage: https://doi.org/10.5066/P9B39W4J
Online_Linkage:

https://www.sciencebase.gov/catalog/item/65135edad34eeedefc13bff0

Description:

Abstract:

This portion of the data release presents topographic survey data of portions of Oxbow Reservoir in Placer County, California. These data were collected on 26 October 2022, when the reservoir was partially de-watered to allow repairs to the dam infrastructure following the Mosquito Fire. Although the gates of the dam were open during this time, significant portions of the reservoir site remained inaccessible to surveyors due to the continued flow of the Middle Fork American River. Consequently, these data cover approximately 50 percent of the total surface area of the reservoir at full pool. The data were collected using two RTK GNSS backpack rovers which were referenced to a temporary GNSS base station occupying a fixed control point ("CP512") located less than 1 kilometer from the survey area. Precise coordinates for the GNSS base station were derived using the National Geodetic Survey (NGS) Online Positioning User Service (OPUS). The GNSS data are presented as a comma-delimited text file.

Purpose:

These data are intended to be used as a record of baseline bottom sediment elevation in Oxbow Reservoir immediately after the Mosquito Fire, prior to the first post-fire runoff events during the winter of 2022-2023.

Supplemental_Information:

Additional information about the field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-666-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 dataset 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:

Single_Date/Time:

Calendar_Date: 20221026

Currentness_Reference: ground condition at time data were collected

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -120.74457
East_Bounding_Coordinate: -120.73185
North_Bounding_Coordinate: 39.00609
South_Bounding_Coordinate: 39.00018

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme_Keyword: geoscientificInformation

Theme:

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

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: topography
Theme_Keyword: topographic maps
Theme_Keyword: geomorphology
Theme_Keyword: geospatial datasets

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: topographic mapping

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: CHMRP
Theme_Keyword: Pacific Coastal and Marine Science Center
Theme_Keyword: PCMSC

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:65135fb4d34eeedefc13c1fc

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: State of California
Place_Keyword: Placer County
Place_Keyword: Oxbow Reservoir
Place_Keyword: Oxbow Bar
Place_Keyword: Alabama Bar
Place_Keyword: Middle Fork American River
Place_Keyword: Rubicon River

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 navigation 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

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

Browse_Graphic:

Browse_Graphic_File_Name:

https://www.sciencebase.gov/catalog/file/get/65135fb4d34eeedefc13c1fc?name=OxbowReservoirTopographicData_browse.jpg&allowOpen=true

Browse_Graphic_File_Description: Topographic survey operations at Oxbow Reservoir.
Browse_Graphic_File_Type: JPEG

Native_Data_Set_Environment:

Microsoft Windows 10, Trimble Business Center 5.9.0, ESRI ArcGIS Pro 2.9.1

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted.

Logical_Consistency_Report: No formal logical accuracy tests were conducted.
Completeness_Report:

Dataset is considered complete for the information presented, as described in the abstract. During the survey significant portions of the reservoir bottom remained under water and inaccessible to surveyors. Consequently, this DEM covers approximately 50 percent of the total surface area of the reservoir at full pool.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The topographic survey data used to create the DEM were collected using multi-constellation dual-frequency RTK GNSS rovers receiving differential corrections from a base station operating less than 1 kilometer away. The average estimated horizontal precision of the topographic survey data was 0.028 meters at the 95 percent confidence level. Additional uncertainty related to the reference position of the GNSS base station is estimated to be 0.040 at the 95 percent confidence level, based on the NGS OPUS position solution report which was used to derive the position. Combining the estimated single point precision of the topographic survey data with the estimated uncertainty in the position of the GNSS base station reference point results in a total estimated horizontal accuracy of 0.049 meters at the 95 percent confidence level. Additional sources of error such as antenna height measurement errors, and errors resulting from the GPS antenna not being perfectly level during continuous surveying sessions may be present in the data, but the magnitudes of such errors are unknown.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

The topographic survey data used to create the DEM were collected using multi-constellation dual-frequency RTK GNSS rovers receiving differential corrections from a base station operating less than 1 kilometer away. The average estimated vertical precision of the topographic survey data was 0.058 meters at the 95 percent confidence level. Additional uncertainty related to the reference position (orthometric height) of the GNSS base station is estimated to be 0.125 meters at the 95 percent confidence level, based on the NGS OPUS position solution report which was used to derive the position. Combining the estimated single point precision of the topographic survey data with the estimated uncertainty in the position of the GNSS base station reference point results in a total estimated vertical accuracy of 0.138 meters at the 95 percent confidence level. Additional sources of error such as antenna height measurement errors, and errors resulting from the GPS antenna not being perfectly level during continuous surveying sessions may be present in the data, but the magnitudes of such errors are unknown.

Lineage:

Process_Step:

Process_Description:

A topographic survey was conducted using two multi-constellation dual-frequency RTK GNSS rovers (Trimble R10-2) receiving differential corrections from a GNSS base station operating less than 1 kilometer away. The rovers were mounted on GPS backpacks, and were operated in continuous survey mode, collecting data at rate of 1 Hz. The surveyors walked on all exposed reservoir sediment bars which were accessible during the survey. The surveyors attempted to survey along breaks in slope, water surface elevation contours, with additional data in broad planar areas in order to adequately define the topographic surface. Additional survey data were collected along pre-defined "zig-zag" transects which could be re-occupied with a boat during a possible future bathymetric survey with the reservoir at full pool.
The GNSS base station was placed on an existing control point, "CP512", on the west shoulder of Tahoe National Forest Road 0023-004, approximately 100 meters north of the reservoir below the junction with Forest Road 0023 and Forest Road 0023-02. The reference position provided for CP512 were: CP512-PCWA (SPCS83 California zone 2, ft) Northing: 2129745.418 Easting: 6919711.944 Elevation: 1486.07 (assumed ft., NGVD29)
During the RTK survey, the GNSS base station was set to collect static observations, and these were submitted to the National Geodetic Survey (NGS) Online Positioning User Service (OPUS-S). The OPUS solution was of high quality, conforming to USGS Level III quality for a single-base OPUS-S survey. The coordinates of the OPUS-S solution are below: CP512-USGS (NAD83(2011) UTM Zone 10, meters) Northing: 4319590.574 Easting: 695699.448 Elevation: 453.791 (NAVD88, meters, derived using GEOID18)
The newly derived position for CP512 was used to adjust all of the topographic survey data collected during the survey. Survey points with estimated vertical uncertainty greater than 1 meter were removed from the data set.

Process_Date: 20221026
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Joshua Logan
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: 831-460-7519
Contact_Electronic_Mail_Address: jlogan@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: 26040

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: 0.001
Ordinate_Resolution: 0.001

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: NAD83 (National Spatial Reference System 2011) (EPSG:1116)
Ellipsoid_Name: GRS 1980 (EPSG:7019)
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 (EPSG:5703), derived using GEOID18

Altitude_Resolution: 0.001
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: pid
Attribute_Definition: Point ID
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:

Unrepresentable_Domain: A unique identification code for the point.

Attribute:

Attribute_Label: northing_utmz10_m
Attribute_Definition:

Northing coordinate of data point relative to the NAD83 (National Spatial Reference System 2011) datum, projected in the Universal Transverse Mercator (UTM) Zone 10 North coordinate system, meters (EPSG:6339)