Digital Elevation Model of Oxbow Reservoir, Placer County, California, October 2022

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Joshua B. Logan
Originator: Amy E. East
Publication_Date: 20231030
Title:
Digital Elevation Model of Oxbow Reservoir, Placer County, California, October 2022
Geospatial_Data_Presentation_Form: GeoTIFF
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/65135f92d34eeedefc13c19f
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 a digital elevation model (DEM) of portions of Oxbow Reservoir in Placer County, California. The DEM was created using topographic survey data 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, this DEM covers approximately 50 percent of the total surface area of the reservoir at full pool. The raw topographic data for the DEM 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 were used to create a triangulated irregular network (TIN), which was converted to raster DEM. The resulting DEM has a horizontal resolution of 1 meter and is formatted as a GeoTIFF.
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 of 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:65135f92d34eeedefc13c19f
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/65135f92d34eeedefc13c19f?name=OxbowReservoirDEM_browse.jpg&allowOpen=true
Browse_Graphic_File_Description: Color-shaded relief image of the Oxbow Reservoir DEM.
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:
No formal horizontal accuracy tests were performed. 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. It should be noted that the magnitudes of these errors are exceeded by the 1-meter horizontal resolution of the DEM.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Vertical accuracy of the DEM was estimated by withholding 631 randomly selected check points from the original topographic survey data set and comparing the elevations of those points with the DEM. The resulting vertical RMSE for these 631 points was 0.101 meters (0.198 meters at the 95 percent confidence level) which represents the relative precision of the DEM. Additional uncertainty related to the reference position of the GNSS base station is estimated to be 0.064 meters (0.125 at the 95 percent confidence level), based on the NGS OPUS position solution report which was used to derive the position. Combining the vertical RMSE of the DEM with the estimated uncertainty in the position of the GNSS base station reference point results in a total estimated vertical accuracy of 0.120 meters (0.234 meters at the 95 percent confidence level). It should be noted that there are likely additional interpolation errors with unknown magnitudes in some portions of the DEM resulting from interpolation across breaks in slope which may have been poorly defined during the topographic survey.
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.
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
Process_Step:
Process_Description:
DEM development: 1. Topographic data points were filtered to remove points with poor estimated vertical accuracy. 2. Approximately 3 percent of the remaining points (n=631) were randomly selected and withheld from the data set to serve as a validation set (described in the Vertical Positional Accuracy portion of this document). 3. ArcGIS Pro was used to create a Triangulated Irregular Network (TIN) with the remaining points. 4. Breaklines were added manually along the main river channel portions to reduce interpolation errors in these locations. 5. The TIN was edited to define the interpolation boundary extent (removing long triangles from the exterior). 6. The TIN was exported to a GeoTIFF raster with a pixel resolution of 1 meter.
Process_Date: 2023
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Joshua Logan
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Position: Physical Scientist
Contact_Address:
Address_Type: mailing address
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: US
Contact_Voice_Telephone: 831-460-7519
Contact_Facsimile_Telephone: 831-427-4748
Contact_Electronic_Mail_Address: jlogan@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
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: row and column
Coordinate_Representation:
Abscissa_Resolution: 1.000
Ordinate_Resolution: 1.000
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: GeoTIFF
Entity_Type_Definition: GeoTIFF containing elevation values.
Entity_Type_Definition_Source: Producer defined
Overview_Description:
Entity_and_Attribute_Overview:
GeoTIFF raster contains elevations in meters relative to the North American Vertical Datum of 1988 (NAVD88).
Entity_and_Attribute_Detail_Citation: U.S. Geological Survey
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - ScienceBase
Contact_Address:
Address_Type: mailing address
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: United States
Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov
Resource_Description: The Oxbow Reservoir DEM is available as a GeoTIFF file.
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: GeoTIFF 1.1
Format_Information_Content:
GeoTIFF contains a Digital Elevation Model (DEM) with single-precision floating-point values compressed using the LZW lossless compression method. No data value is -32767.
File_Decompression_Technique: none
Transfer_Size: 0.432
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P9B39W4J
Network_Resource_Name:
https://www.sciencebase.gov/catalog/file/get/65135f92d34eeedefc13c19f?name=OxbowReservoir_2022-10-26_DEM_1m.tif
Network_Resource_Name:
https://www.sciencebase.gov/catalog/item/65135f92d34eeedefc13c19f
Access_Instructions:
Data can be downloaded using the Network_Resource_Name links. The first link is direct link to download the DEM in GeoTIFF format. The second link points to a landing page with the DEM, metadata, and a browse image. The third link points to the landing page for the entire data release, including links to pages of the various data files.
Fees: None.
Technical_Prerequisites:
These data can be viewed with GIS software or other software capable of displaying geospatial raster data.
Metadata_Reference_Information:
Metadata_Date: 20231030
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
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_P9B39W4J/OxbowReservoir_2022-10-26_DEM_1m_metadata.html>
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