Metadata: Identification_Information: Citation: Citation_Information: Originator: Daniel J. Nowacki Originator: Cordell Johnson Originator: Richard M. Buzard Originator: Alexander G. Snyder Originator: Li Erikson Publication_Date: 20250708 Title: Bathymetry at entrance to Golovnin Lagoon, Alaska, 2024 Geospatial_Data_Presentation_Form: tabular digital data Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P13YIWKC 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/P13YIWKC Larger_Work_Citation: Citation_Information: Originator: Li Erikson Originator: Ann E. Gibbs Originator: Richard M. Buzard Originator: Daniel J. Nowacki Originator: Alexander G. Snyder Originator: Anita C. Engelstad Originator: Cordell Johnson Originator: Alexander L. Nereson Originator: Jin-Si R. Over Originator: Paul Russel Originator: Colin Lyons Publication_Date: 2025 Title: In situ field data, Coastal Alaska, 2023 to 2025 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P13YIWKC Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Other_Citation_Details: Suggested Citation: Suggested Citation: Erikson L.H., Gibbs A.E., Buzard R.M., Nowacki D.J., Snyder A.G., Engelstad A.C., Johnson C., Nereson A.L., Over J.R., Russel, P., Lyons, C., 2025, In situ field data, Coastal Alaska 2023 to 2025: U.S. Geological Survey data release, https://doi.org/10.5066/P13YIWKC Description: Abstract: This dataset contains nearshore bathymetry measurements collected at the entrance to Golovnin Lagoon, Alaska. The data were collected in September 2024 and subsequently processed by the U.S. Geological Survey, Pacific Coastal and Marine Science Center. Results are provided in a comma-separated value format (csv). Purpose: This product was created to advance coastal storm response and recovery in Alaskan coastal communities in the wake of the September 2022 extratropical Typhoon Merbok disaster. It is being used by the USGS to support the development of dynamic flood models for more than 20 communities along the northwest coasts of Alaska. This product is intended for reuse by scientists, managers, and the general public. These data can be opened with any text viewer, spreadsheet editor, or geographic information systems (GIS) software for review, visualization, and analysis purposes. Supplemental_Information: Work was funded by Title VII of Division N in the Consolidated Appropriations Act, 2023 (Public Law 117–328) to support direct recovery and rebuilding decisions in the wake of declared disasters related to hurricanes and typhoons in 2022. For more information on these efforts, see https://www.usgs.gov/supplemental-appropriations-for-disaster-recovery-activities/typhoon-merbok-coastal-community. Additional information about the field activity from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2024-635-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 dataset in nonproprietary form, this metadata file may include some vendor-specific terminology. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20240911 Currentness_Reference: ground condition at the time source data were collected Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -163.08766 East_Bounding_Coordinate: -162.99025 North_Bounding_Coordinate: 64.54394 South_Bounding_Coordinate: 64.52270 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:55f62112-931f-464e-a478-e54778230e75 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: elevation Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: bathymetry Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Theme_Keyword: coast Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Hazards and Resources Program Theme_Keyword: CMHRP Theme_Keyword: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: State of Alaska Place_Keyword: Nome Census Area Place_Keyword: City of Golovin Place_Keyword: Golovnin Bay Place_Keyword: Golovnin Lagoon Access_Constraints: No access constraints 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 navigation purposes. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: PCMSC Science Data Coordinator Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: golovnin_lagoon_2024_bathy_browse.png Browse_Graphic_File_Description: Satellite image overlain with bathymetry data points collected at the entrance to Golovnin Lagoon, Alaska in September 2024. Browse_Graphic_File_Type: PNG Native_Data_Set_Environment: MATLAB Version: 9.8.0.1396136 (R2020a) Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted. Logical_Consistency_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. 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: Survey-grade positions of the small boat were achieved with global navigation satellite system (GNSS) receivers and a single GNSS base station. The position of the GNSS base station was derived from two static GNSS occupations from July 10 and 11, 2024, with durations of approximately 11 and 12 hours, respectively. The static observations were processed using the National Geodetic Survey Online Positioning User Service (OPUS) and averaged to derive the final base station coordinates relative to the North American Datum of 1983 (2011 realization). Positioning data from the survey vessels were post-processed using Waypoint Grafnav to apply differential corrections from the GNSS base station. Manufacturer reported accuracy for the differentially corrected horizontal positions for the GNSS rover trajectories is 0.8 cm plus 1 ppm. Baselines from the GNSS base station varied between 0.4 km and 2.8 km, suggesting the average horizontal accuracy of survey vessel position to be about 3.6 cm. Uncertainty in the horizontal positions associated with pitch and roll of the survey vessels is unknown. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Uncertainty in the final elevations is derived from the combination of uncertainty in the GNSS positioning and bathymetric sounding measurements. Manufacturer reported accuracy for the differentially corrected vertical positions for the GNSS rover trajectories is 1.5 cm plus 1 ppm relative to the benchmark elevation, combined with the vertical accuracy of the NGS OPUS-derived position of the GNSS base station. Baselines from the GNSS base station reached 2.8 km, suggesting the vertical accuracy of survey vessel GNSS height relative to the ellipsoid to be 1.8 cm. However, the Geoid12b error in this region is 0.352 meters, bringing the orthometric (NAVD88) vertical accuracy to 0.354 m. The manufacturer of the single-beam echosounder used in this study reports a vertical accuracy of 1 cm. Additional uncertainty in the final computed elevations data is related to unmeasured variability in the speed of sound used to compute depths from bathymetric soundings and, thus, is depth-dependent. Based on analysis of available speed of sound measurements, we estimate uncertainties in the final depth soundings to be no greater than 1 percent of the water depth. The total vertical uncertainty is calculated using the constant- and depth-dependent factors summed in quadrature. Due to the relatively large error in the Geoid12b model, the final orthometric elevations range from 35.4 cm to 37.7 cm, with an average of 35.6cm. However, when working within geoid 12b, we recommend using the vertical accuracy values relative to the to the ellipsoid, which range from 2.1 cm to 13.1 cm, with an average of 7.6 cm. Uncertainty in the vertical positions associated with pitch and roll of the survey vessels is unknown. Lineage: Process_Step: Process_Description: Bathymetric data were collected using a single-beam sonar system and global navigation satellite system (GNSS) receiver mounted on a small boat. The sonar systems consisted of a CEE Hydrosystems CeeScope single-beam echosounder and 200 kHz transducer with a 9-degree beam angle. Depths from the echosounders were computed using sound velocity profiles measured using a YSI CastAway CTD during the survey. Positioning of the survey vessels was determined at 10 Hz using survey-grade GNSS receivers. Small boat operator to surveyed lines at speeds of 2 to 3 meters per second. Process_Date: 20240911 Process_Step: Process_Description: Positions of the survey platforms were post-processed using a single-base station and differential post-processing. The position of the GNSS base station was derived from two static GNSS occupations from September 10 and 11, 2024, with durations of approximately 11 and 12 hours, respectively. The static observations were processed using the National Geodetic Survey Online Positioning User Service (OPUS) and averaged to derive the final base station coordinates relative to the North American Datum of 1983 (2011 realization). Positioning data from the GNSS receiver on the vessel was post-processed using Waypoint Grafnav to apply differential corrections from the GNSS base station. Orthometric elevations relative to the NAVD88 vertical datum were computed using National Geodetic Survey GEOID12A offsets. Bathymetric data were merged with post-processed positioning data and spurious soundings were removed using a custom Graphical User Interface (GUI) programmed with the computer program MATLAB. The final point data from the PWCs are projected in Cartesian coordinates using the UTM Zone 3 North, meters coordinate system. Process_Date: 20241020 Process_Step: Process_Description: All available bathymetry data from the survey were compiled into a comma-delimited text file for distribution. Process_Date: 20250625 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 213752 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 3 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -165.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.6096 Ordinate_Resolution: 0.6096 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: D NAD 1983 2011 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: bathymetry_golovnin_lagoon_2024.csv Entity_Type_Definition: Comma Separated Value (CSV) file containing data. Entity_Type_Definition_Source: Producer Defined Attribute: Attribute_Label: Longitude Attribute_Definition: Longitude in decimal degrees, WGS 1984 Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -163.0859978 Range_Domain_Maximum: -162.9919697 Attribute_Units_of_Measure: decimal degrees Attribute_Measurement_Resolution: 0.0000001 Attribute: Attribute_Label: Latitude Attribute_Definition: Latitude in decimal degrees, WGS 1984 Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 64.5229975 Range_Domain_Maximum: 64.5437963 Attribute_Units_of_Measure: decimal degrees Attribute_Measurement_Resolution: 0.0000001 Attribute: Attribute_Label: Easting_m_UTM Attribute_Definition: X coordinate (easting) in meters NAD83(2011) / UTM zone 3N (EPSG: 6332) Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 591785.48 Range_Domain_Maximum: 596363.12 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Northing_m_UTM Attribute_Definition: Y coordinate (northing) in meters NAD83(2011) / UTM zone 3N (EPSG: 6332) Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 7156801.94 Range_Domain_Maximum: 7158997.85 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: UTM_Zone Attribute_Definition: UTM Zone in NAD83(2011) / UTM zone 3N (EPSG: 6332) Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 3N Enumerated_Domain_Value_Definition: UTM Zone 3 North Enumerated_Domain_Value_Definition_Source: Producer defined Attribute: Attribute_Label: Elevation_m_NAVD88 Attribute_Definition: Orthometric height (elevation) in meters NAVD88 GEOID12B Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -13.41 Range_Domain_Maximum: 0.25 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Overview_Description: Entity_and_Attribute_Overview: These metadata describe a comma-separated value (csv) file containing bathymetry data from the entrance to Golovnin Lagoon, Alaska. The first line is a header line and each subsequent line contains x and y coordinates in meters NAD83(2011) / UTM zone 3N (EPSG: 6332) and an orthometric height (elevation) in meters NAVD88 GEOID12B. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - CMGDS Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Resource_Description: These data are available in a comma-separated value format (csv) accompanied by CSDGM FGDC-compliant 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Comma-delimited text Format_Version_Number: Microsoft Excel (version 2408 (Build 17928.20538 Click-to-Run)) Format_Information_Content: comma-delimited text file File_Decompression_Technique: No compression applied. Transfer_Size: 11.3 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P13YIWKC Access_Instructions: Data and metadata can be downloaded using the Network_Resource_Name link and scrolling down to the Sonar Data section. Fees: None Technical_Prerequisites: These data can be opened with any text viewer, spreadsheet editor, or geographic information systems (GIS) software. Metadata_Reference_Information: Metadata_Date: 20250708 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: PCMSC Science Data Coordinator Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 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