The National Oceanic and Atmospheric Administration (NOAA) has the statutory mandate to collect hydrographic data in support of nautical chart compilation for safe navigation and to provide background data for engineers, scientific, and other commercial and industrial activities. Hydrographic survey data primarily consist of water depths, but may also include features (e.g. rocks, wrecks), navigation aids, shoreline identification, and bottom type information. NOAA is responsible for archiving and distributing the source data as described in this metadata record.

The National Oceanic and Atmospheric Administration (NOAA) has the statutory mandate to collect hydrographic data in support of nautical chart compilation for safe navigation and to provide background data for engineers, scientific, and other commercial and industrial activities. Hydrographic survey data primarily consist of water depths, but may also include features (e.g. rocks, wrecks), navigation aids, shoreline identification, and bottom type information. NOAA is responsible for archiving and distributing the source data as described in this metadata record.

The Australian Antarctic Division identified areas that required hydrographic surveying.
(See map available in the download at \Plans and Instructions\HPS Supplied Data\davis_plan_2019_2020 version 5.1.pdf and a shapefile of the identified areas at FSD\ArcGIS\Pink V2\AOI_Unproject_wgs84.shp)

A team from the Maritime Geospatial Warfare Unit, of the Australian Hydrographic Service, was at Davis in early February 2020. Single beam and side scanning survey data was collected on the water, beach profiles collected and rock data.

Single beam and side scanning survey data
Areas A, D, F, H, I, J and K were ice free.
Area J was further broken down into four areas, J1, J2, J3 and J4.
Areas A, D and F were thoroughly surveyed with 10m mainline spacing with 20m X-line spacing.
Areas I, J3 and J4 were surveyed but due to time constraints were surveyed at approximately 40m line spacing to provide 200% sea floor coverage with the SSS to detect any features dangerous to navigation with one shoal detected in area I which is mentioned in Section I.
Area H was too shallow to survey at any other time except high tide and it was decided to focus on other areas as the survey of this area would not value add to the required results of the survey.
Area J1, J2 and K were not surveyed due to time constraints.

RTK corrections or access to the CORS network couldn't be made to the CEESCOPE survey system. Instead positioning during the survey was recorded exclusively with the NovaTel GNSS 850 Antenna. No post processing was conducted. The team wasn't able to determine why the CEESCOPE was unable to connect to the CORS network or Base Station to gain RTK corrections, despite considerable effort spent problem solving and conducting a number of trials. Tide data collected was applied to the data and all tidal information is explained in section F of the report.

A map showing the surveyed areas can be found in the report.
Raw data in caris format is available from the Australian Hydrographic Office (AHO). Sounding data, stored as a shapefile, is available as a download file.

Beach profiles
Sites were also surveyed with 5m line spacing to maximise seafloor coverage, at 5 beach locations, 4 in area A and 1 in Area F. ArcGIS projects and PDF documents displaying the depth data and significant rocks are included in the download. Please note the ArcGIS projects do not include the AHO chart, due to distribution restrictions on digital charts. It is included in the PDF documents. These documents refer to images taken from the survey boat and spreadsheets displaying gradients data.

Rock data
A shapefile recording conspicuous rocks as well as photographs is available for downloading.

Bench mark positions were reclaimed using Trimble R10 and post processed with AUSPOS.

Abbreviations used in the download directories
ROS = Report of Survey,
FSD = Final Survey Data

A detailed report can be found at /ROS/

Projection……..…...…...………….….……..Universal Transverse Mercator (UTM) Zone 43 South
Horizontal Datum……………………………World Geodetic System 1984 (WGS84)
Vertical Datum…………………………….....Approximated Lowest Astronomical Tide (LAT)
Sounding Depths.……………………………Metres (m)

Survey Date………………..………………….6th - 18th Feb 2020
Bathymetric Accuracy Horizontal……………± 0.8m
Bathymetric Accuracy Vertical………………±0.46m
Sounding Density……………………………..2m Surface
Chart Reference………………………………AUS 451, 602​

ITRF 2014 and GRS80 were utilised for static observations of bench marks and levelling to the tide pole for establishment of approximate LAT. Hypack v19.1.11.0 which was used to gather all bathymetric data does not have the option to use the ITRF datum and the WGS84 Datum was used.

This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. Digital shoreline vectors derived from bromide or mylar copies of National Ocean Service T-sheets or hydrographic surveys. Area covered includes Chesapeake Bay and tidal tributary shorelines along the western side of the Chesapeake Bay and five 7.5' quadrangles on the lower eastern shore of the Chesapeake Bay. Last Updated: Feature Service Layer Link: http://geodata.md.gov/imap/rest/services/Hydrology/MD_ShorelineChanges/MapServer/2 ADDITIONAL LICENSE TERMS: The Spatial Data and the information therein (collectively "the Data") is provided "as is" without warranty of any kind either expressed implied or statutory. The user assumes the entire risk as to quality and performance of the Data. No guarantee of accuracy is granted nor is any responsibility for reliance thereon assumed. In no event shall the State of Maryland be liable for direct indirect incidental consequential or special damages of any kind. The State of Maryland does not accept liability for any damages or misrepresentation caused by inaccuracies in the Data or as a result to changes to the Data nor is there responsibility assumed to maintain the Data in any manner or form. The Data can be freely distributed as long as the metadata entry is not modified or deleted. Any data derived from the Data must acknowledge the State of Maryland in the metadata.

Fugro conducted single beam bathymetry surveys along portions of the Lower Sacramento River Basin, American River, and Feather River (including associated tributaries) on various dates in 2010. This consisted of over 190.5 miles of riverbed. More specifically, the survey areas included the underwater cross sections of the river bottom along portions of the Feather River, Honcut Creek, Knights Landing, Jack Slough, Yuba River, Yankee Slough, Bear River, Sacramento River, Elk Slough, Natomas Cross Canal, American River, Steamboat Slough, Miner Slough, Sutter Slough, Georgianna Slough, Three Mile Slough, Lindsey Slough, Cache Slough, Haas Slough, and Horseshoe Bend. This project was titled 'Central Valley Floodplain Evaluation and Delineation - Bathymetry Surveying in Support of Hydraulic Model Development' (contract number - 4600007989, task order no.18). The data were collected in NAD83 and NAVD88 datums (Horizontal Units: Feet, Vertical Units: Feet).Additionally, Fugro West, Inc. performed two reconnaissances of the Lower Sacramento River within the limits of the proposed bathymetric survey described in Task Order 18, California Department of Water Resources, Contract 4600007989. The first reconnaissance was performed during the periods of October 8th thru 13th, 2009, and the second reconnaissance was performed January 7th and 8th, 2010. The second reconnaissance was necessary due to the extension of the original survey limits.The purpose of the reconnaissance efforts was to gather information regarding possible launch facilities, emergency pick-up and drop-off locations, and potential hazards within the limits of the bathymetric survey. The reconnaissance was performed by driving along the levees and performing visual inspections along the survey areas including visiting all boat launch facilities. The locations were collected using a hand held GPS and noted in a log book. Based on data gathered hydrographic surveying can be performed along most of the areas with no major difficulties. Boat launches were found at acceptable intervals along the rivers to allow safe deployment and recovery of the survey vessel. Accommodations were found throughout the survey area allowing minimal travel and comfortable conditions.The following summarizes the condtions found with respect to the bathymetric surveys:• Feather River – good depths with some sand bars and debris from the Sacramento River to Boyds Pump Ramp, from this location to the north extent of the survey area some shallow areas with 3’-5’.• Honcut Creek – trees on both banks of river and areas of dense vegetation. No water then preventing any survey work.• Jack Slough – large amounts of vegetation and debris in water preventing any survey work.• Yuba River – good depths from Feather River to E Sreet bridge, from here east depths are 2’-3’.• Yankee Slough – large amounts of vegetation preventing any survey work.• Bear River – Could not get access into area from Sacramento River to Highway 70 Bridge, from this location heading East large amounts of vegetation preventing any survey.• Natomas Cross Canal – Narrow in some areas with large amounts of vegetation, may be able to survey partial area near Sacramento River.• American River – Shallow water 3’-6’ with rapids in some areas.• Knights Landing Ridge Cut - dense vegetation growth in river, preventing any survey.• Elk Slough - dense vegetation along the river banks, log debris in the river unable to survey.• Sacramento River – good surveying conditions throughout.• Steamboat Slough – good survey conditions throughout.• Miner Slough – good survey conditions throughout.• Sutter Slough - good survey conditions throughout.• Georgianna Slough - good survey conditions throughout.• Three Mile Slough - good survey conditions throughout.• Lindsey Slough - good survey conditions throughout.• Cache Slough - good survey conditions throughout. 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 3.5, dated April 12, 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.