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i06_Bathy_USACE_200201_DeepWaterShipChannel
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Shawn Mayr
Department of Water Resources, Division of Regional Assistance, North Central Region Office, Hydrography and Technical Support
Senior Engineer
916-376-9664
3500 Industrial Blvd
West Sacramento
CA
95691
US
Shawn.Mayr@water.ca.gov
8AM-5PM Mon-Fri
Call or email
To be determined.
Call or email data request.
Vector
Feature Class
2019-11-07
Original
Vector Digital Data
CA-DWR NCRO Delta Bathymetry
Sacramento Deep Water Ship Channel, August 2019
i06_Bathy_USACE_200201_DeepWaterShipChannel
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The California Department of Water Resources (CA-DWR), North Central Region Office (NCRO), Bathymetry Data Collection Section, conducted a bathymetric survey of selected parts of the Sacramento Deep Water Ship Channel and Lake Washington for the Bay Delta Office (BDO). The main purpose of the data is to obtain elevation data in the shoals to supplement a December 2018 interferometric survey by USGS, to validate other datasets, and to replace outdated and inaccurate data in some areas. A separate multibeam survey was conducted for the Ship Channel headwaters, from the Industrial Blvd. overpass east to the Sacramento River locks. These data will inform modeling efforts to aid in the evaluation of a large number of restoration proposals nearby. </SPAN><SPAN><SPAN>The original field survey data were collected in NAD83 (California State Plane Zone II coordinate system) and NAVD88 datums.</SPAN></SPAN></P><P><SPAN>• Survey Dates: August 5-8, 2019 </SPAN></P><P><SPAN>• Instrumentation: Singlebeam echo sounder with Inertially-Aided Post-Processed Kinematic (IAPPK) GPS procedures. </SPAN></P><P><SPAN>• Point Spacing: about 1 Foot</SPAN></P><P><SPAN>• Horizontal Units: US Foot</SPAN></P><P><SPAN>• Vertical Units: US Foot</SPAN></P><P><SPAN>• Related datasets: Sacramento Deep Water Ship Channel Multibeam, August 2019; USGS Sacramento Deep Water Ship Channel Multibeam, December 2018 (EXTERNAL);</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.
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 3.6, dated September 27, 2023.
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.
California Department of Water Resources, Division of Regional Assistance, North Central Region Office, Hydrography and Technical Support Section.
Sacramento Deep Water Ship Channel, Lake Washington, Prospect Island
August, 2019
ISO 19115 Topic Categories
Inland Waters
Elevation
Single Beam
Bathymetry
Sonar
Singlebeam
Bathymetry
Sonar
Inland Waters
Sacramento Deep Water Ship Channel
Lake Washington
Prospect Island
Singlebeam
Elevation
August
2019
Bathymetry
DWR GIS Atlas
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.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>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.</SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN>The original source projection of the DWR GIS atlas dataset was California Teale Albers, NAD83. For copies of data in original projection, please contact DWR directly.</SPAN></P></DIV></DIV></DIV>
Washington Lake and Sacramento Deep Water Ship Channel shoals from Industrial Blvd. overpass to the northern end of Prospect Island
Equipment and Methodology Survey Vessel: 18 ft Kingfisher 1825 Falcon XL Singlebeam Sonar Bathymetry System: Receiver: Odom EchoTrac CV100 Transducer: Odom SMSW200-4a 200 kHz Position/GPS: Applanix POS MV WaveMaster II Motion control: Applanix POS MV WaveMaster II Sound velocity: AML Base X2 Sound Velocity Profiler Field Practices: Field calibration tests (including sound velocity readings, and manual depth soundings) were regularly performed in order to ensure data quality and positional accuracy. Singlebeam data were collected on the survey vessel and recorded using Hypack Hydrographic Survey software (Hypack). Data were processed in the Hypack SBMAX singlebeam editor, exported as a text file, and imported to a geodatabase with ArcGIS software. For more detailed information please see the Data Quality Section.
Version 6.2 (Build 9200) ; Esri ArcGIS 10.9.1.28388
1
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38.483513
38.111095
These data were collected using advanced singlebeam sonar and GPS technologies. They are believed to be logically consistent. Visual inspection was conducted and data were reviewed in ArcGIS software packages.
During the survey, areas near the water's edge and areas of shallow water depth were occasionally occupied by aquatic vegetation. Dense aquatic vegetation 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.
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.
GPS post processing was completed using Continuously Operating Reference Stations (CORS) and the National Geodetic Survey website at http://www.ngs.noaa.gov/CORS/.
Locational Quality: Determined to be no better than 1.5 meters horizontal. This report is not being
made by a licensed land surveyor, and is not analogous to a positional accuracy statement as
stipulated in the California Public Resources Code.
Documented instrument horizontal accuracy: Odom CV100 and transducer: n/a // POS MV System: 8 mm + 1 ppm x baseline length, Roll and Pitch 0.015°, Heading 0.03° // AML Base X2 SVP: n/a
Positional accuracy Assessment Method 1 was used.
Documented vertical accuracy: Odom CV100 and transducer: 1 cm ± 0.1% of depth // POS MV System: 15 mm + 1 ppm x baseline length, Heave 5 cm or 5% // AML Base X2 SVP: 0.025 m/s
GPS post processing was completed using Continuously Operating Reference Stations (CORS) and the National Geodetic Survey website at http://www.ngs.noaa.gov/CORS/.
This data set is comprised of elevation points collected using singlebeam sonar bathymetry equipment corrected with GPS position data. Sonar echograms are screened in Hypack Hydrographic Software and outliers, submerged aquatic vegetation, and noise are removed. Data are imported in ArcGIS Desktop as point feature classes 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 September 2019.
Scott Flory
Department of Water Resources, Division of Regional Assistance, North Central Region Office, Bathymetry Data Collection
Senior Environmental Scientist
916-376-9603
3500 Industrial Blvd.
West Sacramento
CA
95691
US
Scott.Flory@water.ca.gov
8AM-5PM Weekdays
Call or Email
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.
Department of Water Resources, Division of Regional Assistance, North Central Region Office, Hydrography and Technical Support
A collection of points representing the xyz coordinates. The final post-processed elevation value in the stated vertical datum is stored in Corr__Depth_1.
i06_Bathy_USACE_200201_DeepWaterShipChannel
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dataset
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