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Lillian Hayden
Department of Water Resources, Division of Regional Assistance, North Central Region Office, Hydrography and Technical Support
Environmental Scientist
916-281-4835
3500 Industrial Blvd
West Sacramento
CA
95691
US
Lillian.Hayden@water.ca.gov
20260225
ArcGIS Metadata
1.0
Bathy_NCRO_20250812_SugarCut
Original
California Department of Water Resources, Division of Regional Assistance, North Central Region Office, Hydrography and Technical Support.
remote-sensing image
CA-DWR NCRO Hydrography
Sugar Cut, August 2025
<div style='text-align:Left;'><div><div><p><span>The California Department of Water Resources (DWR), North Central Region Office (NCRO), Bathymetry Data Collection Section, conducted a bathymetric survey of Sugar Cut for the Division of Operations and Maintenance, Water Projects Planning and Management Branch. The main purpose of the data is to assess trends in riverbed elevations on Sugar Cut between Old River and the siphon intakes for Tom Paine Slough. </span></p><p><span>• Field Dates: August 12, 2025 </span></p><p><span>• Survey Type: Multibeam </span></p><p><span>• Data Density: 1 foot grid </span></p><p><span>• Horizontal Datum: North American Datum of 1983 (NAD83) California Coordinate System (CCS83) State Plane Zone 3, US feet </span></p><p><span>• Vertical Datum: North American Vertical Datum of 1988 (NAVD88) geoid 18, US feet </span></p><p><span>• Processing Epoch: 2025.614; CSRC Datum Epoch: 2017.5 </span></p><p><span>• Related Datasets: Old River at Paradise Cut 2023, Old River at Sugar Cut 2023, Old River at Salmon Slough 2013, Old River East Singlebeam 2022, Old River at Five Points Singlebeam 2018 </span></p><p><span>• Involved Staff: Data collected and processed by NCRO Bathymetry and Hydrography sections </span></p><p><span>• Survey Responsible Charge: Jacob Wright, PLS (CA 8717) </span></p><p><span>Please see associated survey report for full control and QC check details. For complete metadata make sure the viewer (ArcGIS or other software) is set to view FGDC metadata.</span></p></div></div></div>
This bathymetric dataset is intended to be used as a base component of studies in the Sacramento-San Joaquin Delta.
This is an official DWR Image Service, which meets all appropriate requirements of the DWR Spatial Data Standards, specifically the DWR Spatial Data Standard version 3.6, dated September 27, 2023. This archived dataset was developed by DWR for its internal use. This data is not suitable for property boundary determination, construction layout, legal descriptions, or any other professional land surveying or legal purpose. The data represents estimates of past conditions and measurements, may contain errors, and is no longer representative of current conditions. Neither the State of California, its agents, nor its employees, make any warranty, representation or guarantee, express or implied; nor assumes any liability or responsibility for the accuracy, completeness, or usefulness of this data. Comments, problems, improvements, updates, or suggestions should be forwarded to bathymetry@water.ca.gov as available and appropriate.
California Department of Water Resources, Division of Regional Assistance, North Central Region Office, Hydrography and Technical Support.
Shawn Mayr
Department of Water Resources, Division of Regional Assistance, North Central Region Office, Hydrography and Technical Support
Senior Engineer
916-820-8198
3500 Industrial Blvd.
West Sacramento
CA
95691
US
Shawn.Mayr@water.ca.gov
Sugar Cut, Old River, Paradise Cut, Tom Paine Slough
August, 2025
ISO 19115 Topic Categories
elevation
inlandWaters
Bathymetry
Multibeam
Sonar
elevation
inlandWaters
Bathymetry
Multibeam
Sonar
Sugar Cut
Old River
Paradise Cut
Tom Paine Slough
August
2025
<div style='text-align:Left;'><div><div><p><span>This dataset was valid at the time it was measured, however, changes may have occurred since and these data may no longer represent actual surface conditions. The user is responsible for the results of any application of this data for other than its intended purpose. Acknowledgement of the Department of Water Resources, NCRO, Hydrography and Technical Support is appreciated for products derived from these data.</span></p></div></div></div>
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Equipment and Methodology
Survey Vessel: 20 ft Oquawka 2072
Patch Test Date: 03/18/2024
Multibeam Sonar Bathymetry System: Sonar: Reson T20-P Dual-Head MBES // Position/GPS: Applanix POS MV OceanMaster // Motion control: Applanix POS MV OceanMaster // Sound velocity: AML Base X2 Sound Velocity Profiler
Field Practices: Field calibration tests (including multibeam patch tests, fixed surface comparisons and GPS checks) are regularly performed in order to ensure data quality and positional accuracy. Multibeam data were collected on the survey vessel and recorded using Hypack Hydrographic Survey software (Hypack).
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Elevations are generally believed to be characteristic of the channel-bed, however, in some areas with dense vegetation the data may reflect the elevation of the submerged vegetation rather than the seabed surface. “Noisy” patterns in the data are investigated during data processing; these patterns may signify dense submerged vegetation and are typically filtered. Small gaps in the final dataset (≤ 5 ft) are typically interpolated in the hydrographic software, but larger gaps are left.
Total uncertainty depends on combined contributions from sound velocity, offsets, beam angle, and range. Error introduced from the motion of the vessel was corrected using the Applanix POS MV OceanMaster System. Sound velocity profiles were taken regularly to correct the depth recorded by the transducer for changes in temperature and salinity. Orthometric heights were derived from Geoid 18.
These data were collected using advanced hydrographic sonar and GPS technologies. They are believed to be logically consistent. Visual inspection was conducted and data were reviewed in both hydrographic processing and GIS software packages.
Because multibeam echosounder technology is much less efficient at gathering complete surface coverage in shallow water, these areas are often omitted. Subsequent surveys with a singlebeam sounder may be conducted to fill in these gaps -- please contact the metadata distributor listed in the Distribution section if you need information on data availability for projects not listed under "related datasets" in the abstract. Dense aquatic vegetation also interferes with the sounder's ability to record reliable bathymetric information. Therefore, in order to properly represent the bathymetry of the entire channel, elevation data in most areas of the channel occupied by dense aquatic vegetation were omitted from the final data set and appear as gaps in the data.
This dataset was produced for 1 foot grid contours to exceed IHO Order 1a standards for hydrographic surveys.
Sounding uncertainty at 95% confidence interval: < 0.5 ft
This dataset was produced for 1 foot grid contours to exceed IHO Order 1a standards for hydrographic surveys.
Sounding uncertainty at 95% confidence interval: < 0.5 ft
Field data collection: This dataset is comprised of elevation points collected using multibeam sonar bathymetry equipment corrected with GPS position data. Raw multibeam data requires processing to become usable. Because sound velocity varies both temporally and spatially, the field crew breaks down the river stretch to be surveyed into manageable sections of approximately 1 hour of logged survey time. Each section overlaps slightly to prevent missing data. Field data collection was completed August 12, 2025.
Scott Flory
Department of Water Resources, Division of Regional Assistance, North Central Region Office, Bathymetry Data Collection
Senior Environmental Scientist
916-820-7608
3500 Industrial Blvd.
West Sacramento
CA
95691
US
Scott.Flory@water.ca.gov
GNSS Processing: GNSS post-processing was completed in Applanix POSPac-MMS software to create a network solution from neighboring California Spatial Reference System (CSRS), Scripps Orbit and Permanent Array Center (SOPAC), and/or Unavco Continuously Operating Reference Stations (CORS) by creating a virtual base station (SmartBase) near the survey site. These data were combined with sonar, intertial motion and sound velocity data to correctly geolocate each sounding. Please see associated survey report for full control and QC check details. Orthometric heights were derived from Geoid 18.
Scott Flory
Department of Water Resources, Division of Regional Assistance, North Central Region Office, Bathymetry Data Collection
Senior Environmental Scientist
916-820-7608
3500 Industrial Blvd.
West Sacramento
CA
95691
US
Scott.Flory@water.ca.gov
Data post-processing: Initial multibeam processing was performed with Hypack Hydrographic Software. Typically, the multibeam point cloud is loaded into the review software a section at a time and calibration parameters are checked for accuracy and consistency. Erroneous data, outliers and submerged aquatic vegetation are then filtered out by the hydrographer. Once all sections collected during a survey have been reviewed and processed, they are combined together to create a single seamless surface and exported in bag raster format. These rasters are imported in GIS software and reviewed for consistency. Further products and analyses are carried out upon request. Metadata are established and the data are stored. Data processing was completed in August 2025.
Brody Sunderland
Department of Water Resources, Division of Regional Assistance, North Central Region Office, Bathymetry Data Collection
Environmental Scientist
916-820-8211
3500 Industrial Blvd
West Sacramento
CA
95691
US
Brody.Sunderland@water.ca.gov
This is an original dataset produced by the California Department of Water Resources, Division of Regional Assistance, North Central Region Office, Hydrography and Technical Support Section.
California Department of Water Resources, Division of Regional Assistance, North Central Region Office, Hydrography and Technical Support.
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The pixel values in this raster dataset correspond to the elevation or z-value in the stated vertical datum.
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