Metadata: Identification_Information: Citation: Citation_Information: Originator: Ann E. Gibbs Originator: Anita C. Engelstad Originator: Jin-Si R. Over Originator: Richard M. Buzard Originator: Alexander G. Snyder Originator: Alexander L. Nereson Publication_Date: 20260313 Title: Bathymetry at Kotzebue, Alaska, July 2024 Geospatial_Data_Presentation_Form: comma-delimited text 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 (ver. 2.0, March 2026) 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: 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 (ver. 2.0, March 2026): U.S. Geological Survey data release, https://doi.org/10.5066/P13YIWKC. Online_Linkage: https://doi.org/10.5066/P13YIWKC Description: Abstract: This dataset contains nearshore and inland bathymetry near Kotzebue, Alaska. The data were collected on July 10, 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=2024-637-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: 20240710 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: -162.6202721 East_Bounding_Coordinate: -162.5320066 North_Bounding_Coordinate: 66.9245172 South_Bounding_Coordinate: 66.8916359 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:db6b0ba8-c571-4595-81a4-5a5bb16324e0 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: Northwest Arctic Borough Place_Keyword: City of Kotzebue Place_Keyword: Kotzebue Sound 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: kotzebue_2024_bathy_browse.png Browse_Graphic_File_Description: Satellite image overlain with bathymetry data points collected offshore of Kotzebue, Alaska in July 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: All data fall within expected ranges. 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: The estimated horizontal uncertainty of survey points is 0.05 m. Positions of the work skiff from which the survey was conducted were obtained with a survey-grade global navigation satellite system (GNSS) receiver and a GNSS base station. The GNSS base station was set up on an existing benchmark on land (ID BBDY64) during the bathymetry survey. Base station GNSS RINEX files were uploaded to the National Geodetic Survey Online Positioning User Service (OPUS) to derive the final base station coordinates relative to the North American Datum of 1983 (2011 realization). The resulting solutions were compared to the existing coordinates for the benchmark and found to be within 1 cm of published coordinates. Positioning data from the survey vessels were post-processed using Waypoint Grafnav to apply differential corrections from the GNSS base station. Uncertainty in the horizontal positions due to vessel pitch and roll is unquantified but expected to be low given light winds and small waves (less than 1 foot). Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The estimated vertical uncertainty of survey points is included in the dataset ("Elevation_Uncertainty_m") and ranges from 0.05 to 0.59 m. These values were calculated by summing in quadrature the uncertainties from GNSS positioning, echosounder measurements, and modeled sound speed in water. Manufacturer-reported uncertainty for differentially corrected Trimble GNSS rover positions is 1.5 cm plus 1 ppm of the survey baseline, combined with the vertical accuracy of the NGS OPUS-derived GNSS base station position. The single-beam echosounder used in this study has a reported vertical accuracy of 1 cm. The speed of sound in water was not measured during this survey, but it was modeled using representative Arctic coastal temperature and salinity ranges; this uncertainty increases with depth. Vertical error due to vessel pitch and roll was not quantified but is expected to be low given light winds and waves less than 1 ft. Pitch and roll under 4.5 degrees do not affect depth readings for the 9-degree beam transducer, assuming a vertical antenna/transducer installation and relatively flat seafloor. For larger pitch/roll values the depth measurement increases only slightly: a pitch/roll of 20 degrees (effective beam tilt of 15.5 degrees) would increase depth readings by only approximately 3.8 percent. Lineage: Process_Step: Process_Description: Single-beam bathymetry data were collected on July 10, 2024, using a survey-grade echosounder. The system consisted of a CEE HydroSystems CEESCOPE with a 200 kHz transducer (9-degree beam angle) and a Trimble GNSS receiver. The transducer and receiver were attached to the bottom and top (respectively) of a 2.20 meter-long survey rod. The rod was mounted to the side of a 25 ft aluminum work skiff using an adjustable angle bracket. The rod was rotated to a vertical position using a bubble level once the skiff was underway and lowered into the water so the transducer was submerged to a depth of 20 cm. GNSS positions were logged at 10 Hz while traveling at a target speed of under 3 meters per second. Wind conditions were light with 1 ft waves. Process_Date: 20240710 Process_Step: Process_Description: Survey positions were post-processed using a base station and differential post-processing. The position of the GNSS base station was derived from a static GNSS occupation on July 10, 2024. 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 GEOID12B offsets. Bathymetric soundings 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. Process_Date: 20240820 Process_Step: Process_Description: All available bathymetry data from the survey were compiled into a comma-delimited text file for distribution. Process_Date: 20251124 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: 184780 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_kotzebue_20240710.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: -162.6202721 Range_Domain_Maximum: -162.5320066 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: 66.8916359 Range_Domain_Maximum: 66.9245172 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: 604177.02 Range_Domain_Maximum: 607978.28 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: 7421341.14 Range_Domain_Maximum: 7425060.15 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 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: -17.86 Range_Domain_Maximum: 0.84 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Elevation_Uncertainty_m Attribute_Definition: Estimated elevation uncertainty in meters Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.05 Range_Domain_Maximum: 0.59 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 Overview_Description: Entity_and_Attribute_Overview: These metadata describe a comma-separated value (csv) file containing nearshore and inland bathymetry data from Kotzebue, Alaska. The first line is a header line and each subsequent line contains x and y coordinates in decimal degrees WGS 84 (EPSG: 4326), x and y coordinates in meters NAD83(2011) / UTM zone 3N (EPSG: 6332), an orthometric height (elevation) in meters NAVD88 GEOID12B, the uncertainty associated with orthometric height, in meters, and the UTM zone used (3N). 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: 10.6 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: 20260313 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