i06_Bathy_NCRO_20170718_BigBreak

ISO-19139 Metadata

Resource Identification Information:

Citation:
Title:  i06_Bathy_NCRO_20170718_BigBreak

Reference date - publication:  2018-01-24

Edition: Original
Presentation format:  mapDigital

Series:
Name: CA DWR NCRO Bathymetry
Issue: Big Break 2017

Party responsible for the resource - originator: 
Organization's name: Department of Water Resources, Division of Integrated Regional Water Management, North Central Region Office, Hydrography and Technical Support, Shawn Mayr, Senior Engineer

Themes or categories of the resource:  elevation, inlandWaters

Place keywords:
Keywords:  Big Break

Temporal keywords:
Keywords:  January, February, March, April, July, 2017

Theme keywords:
Keywords:  Inland Waters, Elevation, Bathymetry, Single Beam

Theme keywords:
Keywords:  Inland Waters, Elevation, Bathymetry, Single Beam

Theme keywords:
Keywords:  Inland Waters, Elevation, Bathymetry, Single Beam

Theme keywords:
Keywords:  Inland Waters, Elevation, Bathymetry, Single Beam

Descriptive keywords:
Keywords:  Downloadable Data

Thesaurus name: ArcGIS Content Type
Abstract:  The California Department of Water Resources (CA-DWR), North Central Region Office (NCRO), Bathymetry Data Collection Section, conducted a bathymetric survey of Big Break and surrounding creeks and sloughs. The data are needed to help determine local hydraulics, future uses of Big Break, and to serve as a baseline for determining impacts of nearby wetland restoration projects. The survey took place between January and July 2017 using single beam echo sounder technology. The data were positionally corrected using Real-Time Kinematic (RTK) GPS. The data were collected in NAD83 (California State Plane Zone III coordinate system) and NAVD88 datums. • Horizontal Units: US Foot• Vertical Units: US Foot

Purpose: This bathymetric survey was needed to help determine local hydraulics, future uses of Big Break, and to serve as a baseline for determining impacts of nearby wetland restoration projects. The associated data are considered DWR enterprise GIS data, which meet all appropriate requirements of the DWR Spatial Data Standards, specifically the DWR Spatial Data Standard version 3.1, dated September 11, 2019. DWR makes no warranties or guarantees — either expressed or implied — as to the completeness, accuracy, or correctness of the data. DWR neither accepts nor assumes liability arising from or for any incorrect, incomplete, or misleading subject data. Comments, problems, improvements, updates, or suggestions should be forwarded to GIS@water.ca.gov.

Dataset language:  eng
Dataset character set:  utf8

Status:  completed
Maintenance:
Update frequency:  asNeeded


Resource constraints:
Constraints:
Limitations of use: Not for use as a navigation aid. The data reflects measurements taken at specific time periods and the Department of Water Resources makes no claim as to the current state of these waterways. Do not share or publish this data without including proper attribution.

Resource constraints:
Legal constraints:
Limitations of use: The associated data are considered DWR enterprise GIS data, which meet all appropriate requirements of the DWR Spatial Data Standards, specifically the DWR Spatial Data Standard version 3.1, dated September 11, 2019. DWR makes no warranties or guarantees — either expressed or implied — as to the completeness, accuracy, or correctness of the data. DWR neither accepts nor assumes liability arising from or for any incorrect, incomplete, or misleading subject data. The official DWR GIS steward for this data set is Lillian Hayden, who may be contacted at 916-376-1979, or at lillian.hayden@water.ca.gov. Comments, problems, improvements, updates, or suggestions should be forwarded to the official GIS steward as available and appropriate

Spatial representation type:  vector

Processing environment: Esri ArcGIS 13.5.2.57366

Extent:
Geographic element - Bounding rectangle:
West longitude: -121.424116
East longitude: -121.414343
North latitude: 37.812567
South latitude: 37.790392
Vertical extent:
Minimum value: -15.89
Maximum value: 8.72
Extent:
Extent description: Big Break

2017-01-05T00:00:00 2017-07-18T00:00:00
Vertical extent:
Minimum value: -15.89
Maximum value: 8.72
Extent:
Geographic element - Bounding rectangle:
Extent contains the resource: true
West longitude: -121.733556
East longitude: -121.684453
North latitude: 38.026132
South latitude: 38.006205
Vertical extent:
Minimum value: -15.89
Maximum value: 8.72
Supplemental information: Equipment and Methodology NCRO's single beam bathymetry and positioning systems are composed of the following items: Single Beam Bathymetry Systems: • Teledyne Odom CV100 Echo Sounder, • Odom Transducer, • CeeHydroSystems CeeEcho Echo Sounder, • Kingfisher 1825 Falcon XL Vessel • Eddyline Kayak RTK Positioning System: • Trimble R-8 GNSS GPS Real Time Kinematic (RTK) positioning system, and • Trimble Trimark 3 Radio Modem Field Practices: Field calibration tests, hand soundings, and RTK GPS observations were regularly performed in order to ensure data quality and positional accuracy. For more information please see the Data Quality Section.

Credits: California Department of Water Resources, Division of Integrated Regional Water Management, North Central Region Office, Hydrography and Technical Support Section.

Point of contact - pointOfContact: 
Individual's name: Shawn Mayr
Organization's name: Department of Water Resources, Division of Integrated Regional Water Management, North Central Region Office, Hydrography and Technical Support
Contact's position: Senior Engineer

Contact information:
Phone:
Voice: 916-376-9664
Address:
Delivery point: 3500 Industrial Blvd.
City: West Sacramento
Administrative area: CA
Postal code: 95691
Country:  US
e-mail address: Shawn.Mayr@water.ca.gov
Hours of service: 8AM-5PM Weekdays
Contact instructions: Call or Email

Spatial Representation - Georectified:

Number of dimensions: 2
Cell geometry:  area
Transformation parameters are available: false



Check points are available: false

Spatial Representation - Vector:

Level of topology for this dataset:  geometryOnly
Geometric objects:
Object type:  point

Spatial Representation - Vector:

Level of topology for this dataset:  geometryOnly
Geometric objects:
Object type:  point

Reference System Information:

Reference system identifier:
Value: 3857
Code space: EPSG
Version: 6.18.3(9.3.1.2)

Data Quality Information:

Scope of quality information:
Level of the data:dataset

Lineage:
Process step:
When the process occurred:  2017-08-20T00:00:00
Description: Using the Single Beam Editor in the Hypack Hydrographic Survey software, the survey parameters applied to the data collected during the survey. Read parameters include information about: sound velocity, instrumentation coordination and settings, instrumentation offsets, and data sorting. Once the parameters were applied to the raw data, each survey line was examined individually for erroneous data or abnormalities. Survey lines were saved into an "Edited" folder in Hypack after erroneous data was deleted. All of the edited survey lines were then opened together in Single Beam Editor and the "Read Parameters" confirmed. The XYZ text file was imported into ESRI ArcMap as a point feature class and checked for positional consistency and accuracy.

Process contact - processor: 
Individual's name: NCRO Bathymetry Data Collection Section Environmental Scientist
Organization's name: Department of Water Resources, Division of Integrated Regional Water Management, North Central Region Office, Bathymetry and Technical Services
Contact's position: Environmental Scientist

Contact information:
Address:
Delivery point: 3500 Industrial Blvd.
City: West Sacramento
Administrative area: CA
Postal code: 95691
Country:  US
Source data:
Level of the source data: This is an original dataset produced by the California Department of Water Resources, Division of Integrated Regional Water Management, North Central Region Office, Bathymetry Data Collection Section.

Data quality report - Conceptual consistency:
Measure description: These data were collected using advanced Single Beam Sonar and Real Time Kinematic (RTK) GPS technologies. They are believed to be logically consistent. Visual reviews were conducted and data were reviewed in ArcGIS software packages.

Data quality report - Completeness omission:
Measure description: Elevations are generally believed to be characteristic of the channel-bed; however, in some heavily vegetated areas, these data may be more indicative of the elevation of the submerged vegetation, rather than the “bare earth” surface. In deeper areas with low visibility, this discrepancy may not be immediately apparent. “Noisy” patterns in the data are investigated during data processing using Hypack Software. These patterns may signify dense submerged vegetation and are typically filtered.

Data quality report - Quantitative attribute accuracy:
Measure description: Elevations are generally believed to be characteristic of the channel-bed; however, in some heavily vegetated areas, these data may be more indicative of the elevation of the submerged vegetation, rather than the “bare earth” surface. In deeper areas with low visibility, this discrepancy may not be immediately apparent. “Noisy” patterns in the data are investigated during data processing using Hypack Software. These patterns may signify dense submerged vegetation and are typically filtered.

Evaluation method: Ground truth measurements were taken each day of the survey to verify that the positioning and sonar instrumentation were functioning properly. Prior to the survey, CA-DWR NCRO staff set up a base station RTK GPS on a DWR monument, "BB1", located at 2192491.763 ft northing, 6207655.263 ft easting, and at an elevation of 12.930 ft.

Data quality report - Absolute external positional accuracy:
Measure description: Locational Quality: Determined to be no better than 1.5 feet horizontal. This statement has not been verified or approved by a licensed land surveyor.

Evaluation method: Positional accuracy Assessment Method 1 was used.

Data quality report - Absolute external positional accuracy:
Measure description: The Echotrac CV100 sounder has an accuracy of 200kHz-0.01 m +/- 0.1% depth. The RTK GPS System's Vertical Error is 20mm + 1 ppm RMS. Error introduced from the motion of the vessel was corrected using the Applanix POS MV Wavemaster System. The documented error for the POS MV System is: • Vertical Position +/- (15 mm + 1 ppm x baseline length) • Roll and Pitch 0.02° • Heave 5 cm or 5%

Evaluation method: Ground truth measurements were taken each day of the survey to verify that the positioning and sonar instrumentation were functioning properly. Prior to the survey, CA-DWR NCRO staff set up a base station RTK GPS on a DWR monument, "BB1", located at 2192491.763 ft northing, 6207655.263 ft easting, and at an elevation of 12.930 ft.

Distribution Information:

Distributor:
Distributor information - distributor: 
Individual's name: Shawn Mayr
Organization's name: Department of Water Resources, Division of Integrated Regional Water Management, North Central Region Office, Hydrograpy and Technical Support
Contact's position: Senior Engineer

Contact information:
Phone:
Voice: 916-376-9664
Address:
Delivery point: 3500 Industrial Blvd
City: West Sacramento
Administrative area: CA
Postal code: 95691
Country:  US
e-mail address: Shawn.Mayr@water.ca.gov
Hours of service: 8AM-5PM Mon-Fri
Contact instructions: Call or email
Format:
Format name: Feature Class
Format version: ArcGIS 10.5

Ordering process:
Terms and fees: To be determined.
Turnaround time: Call or email data request.

Format:
Format name: Enterprise Geodatabase Feature Class

Metadata Information:

Metadata language:  eng
Metadata character set:  utf8


Last update:  2025-08-11
Maintenance:
Update frequency:  asNeeded



Metadata constraints:
Constraints:
Limitations of use: The Department of Water Resources makes no warranties or guarantees, either expressed or implied, as to the completeness, accuracy or correctness of the data, nor accepts or assumes any liability arising from or for any incorrect, incomplete or misleading subject data. The official CA-DWR GIS Data Steward for this dataset is Scott Flory, who may be contacted at 916-376-9603, or at Scott.Flory@water.ca.gov. Comments, problems, improvements, updates, or suggestions should be forwarded to the official GIS Data Steward.

Metadata contact - pointOfContact: 
Individual's name: Lilly Hayden/Hydrography and Technical Support Section
Organization's name: Department of Water Resources, Division of Integrated Regional Water Management, North Central Region Office
Contact's position: Environmental Scientist

Contact information:
Phone:
Voice: (916)376-1979
Address:
Delivery point: 3500 Industrial Blvd
City: West Sacramento
Administrative area: CA
Postal code: 95691
Country:  US
Scope of the data described by the metadata:  dataset
Scope name: dataset

Name of the metadata standard used: ISO 19139 Geographic Information - Metadata - Implementation Specification
Version of the metadata standard: 2007