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

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Alex 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
Geospatial_Data_Presentation_Form: digital raster and comma-delimited text
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/564bafdce4b0ebfbef0d3322
Description:
Abstract:
This product is a digital elevation model (DEM) for the Little Holland Tract in the Sacramento-San Joaquin River Delta, California based on U.S. Geological Survey (USGS)-collected elevation data, merged with existing topographic and bathymetric elevation data. The USGS collected topographic and bathymetric elevation data in 2015, using a combination of methods. Topographic and shallow-water bathymetric data were collected on foot using a global positioning system (GPS) backpack platform that consisted of survey-grade Trimble R10, and Trimble R7 global navigation satellite system (GNSS) receivers with Zephyr 2 antennas. Bathymetric data were collected using a personal watercraft (PWC) platform that consisted of Trimble R7 GNSS receivers with Zephyr 2 antennas, combined with Odom Echotrac CV-100 single-beam echosounders and 200 kHz transducers. The USGS elevation data were merged with topographic aerial Light Detection and Ranging (lidar) data collected by California Department of Water Resources (DWR) in 2007 and single-beam bathymetric data collected by Environmental Data Solutions (EDS) in 2009 to generate the final DEM. The GeoTIFF raster and comma-delimited text files are available for download at http://doi.org/10.5066/F7RX9954.
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 topographic and 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: 20070101
Single_Date/Time:
Calendar_Date: 20090311
Single_Date/Time:
Calendar_Date: 20150522
Single_Date/Time:
Calendar_Date: 20150608
Single_Date/Time:
Calendar_Date: 20150619
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: -121.671678053
East_Bounding_Coordinate: -121.642613237
North_Bounding_Coordinate: 38.352223681
South_Bounding_Coordinate: 38.280295064
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:564bafdce4b0ebfbef0d3322
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: digital elevation models
Theme_Keyword: bathymetry measurement
Theme_Keyword: topography
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme:
Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
Theme_Keyword: Water Depth
Theme_Keyword: GPS (Global Positioning System)
Theme_Keyword: Echo Sounders
Theme:
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: Global Positioning System (GPS) observations
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Bathymetry and Elevation
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:
Repeatability tests were conducted across different survey platforms during the USGS 2015 elevation survey, but no comparisons to "true" values were conducted. Accuracy of additional data sources could not be assessed.
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:
The Digital Elevation Model (DEM) was created by interpolating between measurements as much as 100 meters apart, for this reason we cannot evaluate the accuracy of each point in the DEM, only the measurements it is based on. The lidar collected by California Department of Water Resources stated a horizontal accuracy of 1 meter. The bathymetric data collected by Environmental Data Solutions (2009) did not report horizontal accuracy. Accuracy estimates for the PWC survey platforms were estimated by computing the standard deviations of the GNSS rover positions relative to the static base station using Waypoint Grafnav (version 5.0). Based on these calculations, the mean horizontal accuracy of GNSS positions at the 95 percent confidence interval (1.96 times the standard deviations assuming a normal distribution) is 3.5 cm. Accuracy estimates for the GPS Backpack survey platforms were based on horizontal precision values calculated in Trimble Business Center. Horizontal precision values for each point are included in the dataset, but overall the minimum, maximum, mean and standard deviation precision calculations were 0.009, 0.103, 0.0239, and 0.006 meters, respectively.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The Digital Elevation Model (DEM) was created by interpolating between measurements as much as 100 meters apart, for this reason we cannot evaluate the accuracy of each point in the DEM, only the measurements it is based on. The lidar collected by California Department of Water Resources stated a vertical accuracy of 18.5 cm. The bathymetric data collected by Environmental Data Solutions (2009) did not report a vertical accuracy. Accuracy estimates for the PWC survey platforms were estimated by computing the standard deviations of the GNSS rover positions relative to the static 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. Accuracy estimates for the GPS Backpack survey platforms were based on vertical precision values calculated in Trimble Business Center. Vertical precision values for each point are included in the dataset, but overall the minimum, maximum, mean and standard deviation precision calculations were 0.194, 0.014, 0.0351, and 0.011 meters, respectively.
Lineage:
Source_Information:
Source_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
Publication_Information:
Publication_Place: Santa Cruz, CA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/F7RX9954
Type_of_Source_Media: digital dataset
Source_Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 20150608
Single_Date/Time:
Calendar_Date: 20150619
Source_Currentness_Reference: ground condition at time data were collected
Source_Citation_Abbreviation: bathy
Source_Contribution:
Bathymetry data were combined with topography data, and then interpolated into a gridded surface. See Process Steps for details.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Alexander G. Snyder
Originator: Andrew W. Stevens
Originator: Emily Carlson
Originator: Jessica R. Lacy
Publication_Date: 2016
Title:
Topographic measurements of Little Holland Tract, Sacramento-San Joaquin Delta, California, 2015, using backpack GPS
Geospatial_Data_Presentation_Form: comma-delimited text and shapefile
Publication_Information:
Publication_Place: Santa Cruz, CA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/F7RX9954
Type_of_Source_Media: digital dataset
Source_Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 20150522
Single_Date/Time:
Calendar_Date: 20150619
Source_Currentness_Reference: ground condition at time data were collected
Source_Citation_Abbreviation: topo
Source_Contribution:
Topography data were combined with bathymetry data, and then interpolated into a gridded surface. See Process Steps for details.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Environmental Data Solutions
Publication_Date: 200905
Title:
West Delta Condition Bathymetric Surveys: Field Data collection Procedures. Prepared for CBEC Inc.
Geospatial_Data_Presentation_Form: Vector Digital Data Set
Publication_Information:
Publication_Place: San Rafael, CA
Publisher: Environmental Data Solutions
Type_of_Source_Media: Digital and/or Hardcopy Resources
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20090311
Ending_Date: 20090414
Source_Currentness_Reference: observed
Source_Citation_Abbreviation: EDS 2009
Source_Contribution:
Bathymetry data were combined with topography data, and then interpolated into a gridded surface. See Process Steps for details.
Source_Information:
Source_Citation:
Citation_Information:
Originator: California Department of Water Resources
Publication_Date: 2007
Title: 2007 Sacramento-San Joaquin Delta LiDAR Acquisition
Geospatial_Data_Presentation_Form: Raster Digital Data Set
Publication_Information:
Publication_Place: Sacramento, CA
Publisher: NOAA's Ocean Service, Office for Coastal Management
Online_Linkage:
http://coast.noaa.gov/dataviewer/index.html?action=advsearch&qType=in&qFld=ID&qVal=2523
Type_of_Source_Media: Digital and/or Hardcopy Resources
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 200701
Ending_Date: 200702
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: DWR 2007
Source_Contribution:
Topography data were combined with bathymetry data, and then interpolated into a gridded surface. See Process Steps for details.
Source_Information:
Source_Citation:
Citation_Information:
Originator: National Oceanic and Atmospheric Administration (NOAA)
Publication_Date: 2012
Title:
2012 NOAA Ortho-rectified Color Mosaic of Sacramento Deep Water Ship Channel, California
Geospatial_Data_Presentation_Form: Raster Digital Data (Aerial Imagery)
Publication_Information:
Publication_Place: Silver Spring, MD
Publisher: National Oceanic and Atmospheric Administration (NOAA)
Type_of_Source_Media: Digital and/or Hardcopy Resources
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20120407
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: NOAA 2012
Source_Contribution: used for shoreline digitizing
Process_Step:
Process_Description:
The elevation data collected by the USGS during this survey were combined with existing data to generate a digital elevation model (DEM). Additional data sources were used to model the topography of the exposed areas of Little Holland Tract and the bathymetry of the surrounding channels. Topographic aerial Light Detection and Ranging (lidar) data (DWR, 2009) were used to generate the DEM in the areas where land is exposed. The lidar dataset required some processing, which included removing returns from water and vegetation. The effect of vegetation was reduced by using the minimum elevation in a 2-meter grid space. Additionally, bathymetric data from 2009 (EDS, 2009) were used to estimate the bathymetry of the channels surrounding Little Holland Tract, and the shoreline was digitized using an aerial photo (NOAA, 2012). The elevation of this shoreline was estimated by averaging the elevation values collected using backpack GPS systems in areas where the survey was spatially coincident with the digital shoreline. Combining the three datasets, USGS 2015 elevation data, DWR 2007 LiDAR, and CBEC 2009 bathymetry, a triangular irregular network (TIN) was generated using ArcMap 10.2.2, using the digitized shoreline as a hard breakline. The TIN was then converted to a grid with 1-meter resolution.
Source_Used_Citation_Abbreviation: all sources cited were used
Process_Date: 20151001
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: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 7948
Column_Count: 2426
Vertical_Count: 1
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: 1.0
Ordinate_Resolution: 1.0
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: Value
Attribute_Definition: Elevation (NAVD88)
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -9.7361621856689
Range_Domain_Maximum: 13.201800346375
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 - ScienceBase
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:
The downloadable data include a digital elevation model (DEM) in both comma-delimited text and GeoTIFF format, as well as 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: GeoTIFF and comma-delimited text
Transfer_Size: 84.6
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
https://www.sciencebase.gov/catalog/file/get/564bafdce4b0ebfbef0d3322
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_dem_FGDC.html>
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