Arnell S. Forde 20240129 Vector Digital Dataset (Point) Arnell S. Forde Emily A. Wei Chelsea A. Stalk 20240129 U.S. Geological Survey data release doi:10.5066/P9I2T4ZE St. Petersburg, Florida U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center https://doi.org/10.5066/P9I2T4ZE From May 7-13, 2023, the U.S. Geological Survey (USGS) conducted a geologic assessment, including bathymetric mapping, near Kailua, Hawaii in support of efforts to construct an artificial coral reef offshore of Marine Corps Base Hawaii (MCBH). Geophysical data were collected as part of the Coastal Sediment Availability and Flux and Defense Advanced Research Protection Agency (DARPA) Reefense projects. This shapefile represents a point dataset of field activity number (FAN) 2023-310-FA chirp subbottom profile 1,000-shot-interval locations. To aid in the registering of digital chirp subbottom profile data collected during USGS FAN 2023-310-FA. Additional survey and data details are available from the USGS Coastal and Marine Geoscience Data System (CMGDS) at, https://cmgds.marine.usgs.gov/fan_info.php?fan=2023-310-FA and in the Field Activity Collection System (FACS) logs, which are included in the download file, 2023-310-FA_logs.zip (Forde and others, 2023). 20230507 20230513 ground condition Complete None planned -157.791906 -157.725053 21.410561 21.445019 USGS Metadata Identifier USGS:dc7001d1-a07e-4975-a179-e332083a928d ISO 19115 Topic Category geoscientificInformation oceans location USGS Thesaurus sub-bottom profiling marine geology geology coastal processes navigational data geospatial datasets None 1,000-shot-interval locations barrier island mapping seismic reflection 2023-310-FA chirp Common Geographic Areas Hawaii Oahu Kailua Southwest Pacific None The U.S. Geological Survey requests to be acknowledged as originator of the data in future products or derivative research. Arnell S. Forde U.S. Geological Survey Geologist Mailing and physical

600 4th Street South

St. Petersburg FL 33701 USA 727-502-8000 aforde@usgs.gov Data collection and processing were performed by Chelsea Stalk, Emily Wei, and Arnell Forde of the USGS St. Petersburg Coastal and Marine Science Center. Environment as of Metadata Creation: Microsoft Windows 10 Version 6.2 (Build 9200); Environmental Systems Research Institute (Esri) ArcMap 10.8.2. The validity or accuracy of marine subbottom profiles is highly qualitative and depends on equipment and operating condition variables. Visual inspection of the shapefile created from the navigation data did not show any major anomalies. This dataset is from one field activity with consistent instrument calibrations. No seismic reflection data were collected on DOY 128 (May 8, 2023) or 129 (May 9, 2023). Subbottom profiles that have less than 1000 shots recorded to their trace headers will not have a corresponding 1000-shot-interval shot file in 2023-310-FA_1000sht.csv, which is included in 2023-310-FA_nav.zip (Forde and others, 2023). Consequently, those lines are also not represented in 2023-310-FA_shots.shp. A total of 84 seismic lines were collected during this field activity. Three lines and their associated navigation were excluded from this data release (Forde and others 2023), due to equipment or acquisition issues, resulting in unusable data files. As the subbottom profile data were acquired, the position of the vessel was continuously determined by an Applanix POS MV Wavemaster II inertial aided navigation system (IANS), which is accurate to within 0.5-2 meters (m). Positions from the POS MV IANS were recorded and written to the seismic trace headers every 0.20 seconds, with unique navigation fixes being recorded every second. The approximately 3-meter offset between the chirp and vessel's IANS reference point has not been accounted for in the comma-delimited American Standard Code for Information Interchange (ASCII) navigation files and trackline map. Navigation files were extracted from the seismic trace headers using Seismic Unix release 44 software (https://github.com/JohnWStockwellJr/SeisUnix) and custom scripts, processed with PROJ.5.1.0 software (https://proj.org/) to generate Universal Transverse Mercator (UTM) Zone 4 North (N) coordinates from latitude and longitude coordinates (World Geodetic System of 1984, WGS84), and then saved as ASCII text files in comma-separated values (CSV) format. A custom script was created to determine instances/navigation fixes for each line where the shot was equal to an interval of 1000 and that data point was output into a new text file, 2023-310-FA_1000sht.csv, which represents the 1000-shot-interval data collected during the survey. 20230807 Arnell S. Forde U.S. Geological Survey Geologist Mailing and physical

600 4th Street South

St. Petersburg FL 33701 USA 727-502-8000 aforde@usgs.gov The reformatted text file was imported into Esri ArcMap 10.8 software to produce a geographic representation of the shotpoint data collected within the survey area, using the latitude and longitude coordinates. A 1,000-shot-interval point shapefile was generated to correlate shot locations on the trackline map with evenly spaced 1,000-shot index markers along the top of the printable profile images. 20231010 Arnell S. Forde U.S. Geological Survey Geologist Mailing and physical

600 4th Street South

St. Petersburg FL 33701 USA 727-502-8000 aforde@usgs.gov Vector Entity point 136 0.0198168346 0.0211353501 Decimal degrees WGS_1984 WGS_84 6378137.0 298.257223563 2023-310-FA_shots.shp Attribute Table Table containing attribute information associated with the dataset. U.S. Geological Survey FID Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Shape Feature geometry. Esri Coordinates defining the features. UTMX UTM-X easting coordinate Universal Transverse Mercator (WGS 1984, Zone 4N) 625195.787 632117.847 UTMY UTM-Y northing coordinate Universal Transverse Mercator (WGS 1984, Zone 4N) 2368122.54 2371935.936 Line Trackline name U.S. Geological Survey Line numbers were assigned by the EdgeTech 424 chirp topside unit during data acquisition and are composed of an alphanumeric identifier and trackline number. The naming convention used for each subbottom line is as follows: xy_line#, where 'x' represents a partial FAN, 'y' denotes the survey area, which is either Marine Corps Base Hawaii (MCBH) or Marine Corps Base Hawaii Coconut Island (MCBH_CI), and 'line#' is the trackline number (for example, 2023_310_MCBH_CI_line01 and 2023_310_MCBH_line01). If recording was prematurely terminated or reran, due to quality or acquisition issues, characters (specifically "a" or "b") or sequentially increasing numbers (such as .001, .002, etc.), were manually appended to the trackline name. Shot Shotpoint number U.S. Geological Survey 1000 6000 Lon Longitude World Geodetic System of 1984 Geographic Coordinate System -157.791906 -157.725053 Lat Latitude World Geodetic System of 1984 Geographic Coordinate System 21.410561 21.445019 YEAR Year of data acquisition U.S. Geological Survey 2023 2023 DOY_HR_MIN Day of year:hour:minute:second U.S. Geological Survey Day of year, hour, minute and second of data acquisition, in Coordinated Universal Time. The entity and attribute information provided here describes the tabular data associated with the shapefile, 2023-310-FA_shots.shp. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the dataset. Navigation files are available as ASCII delimited text files in CSV format. The final navigation files are provided in 2023-310-FA_nav.zip (Forde and others, 2023) and represent the reprojected survey shotpoint navigation, 1,000-shot-interval locations, and start of line files. The entity and attribute information were generated by the individual and/or agency identified as the originator of the dataset. Please review the rest of the metadata record for additional details and information. Arnell S. Forde U.S. Geological Survey Geologist Mailing and physical

600 4th Street South

St. Petersburg FL 33701 USA (727) 502-8000 aforde@usgs.gov This publication was prepared by an agency of the United States Government. Although these data were processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. Shapefile, MXD, KMZ, GIF 2023-310-FA_gis.zip (Forde and others, 2023) contains the survey navigation data represented geospatially using a Google Earth Keyhole Markup Language Zipped (KMZ) file, Esri map document (MXD), shapefiles, and a folder of processed subbottom profile images (accessible via hyperlinks included in the MXD). This metadata record describes the 1,000-shot-interval locations provided in 2023-310-FA_shots.shp, which is one of three Esri shapefiles included in the geographic information system (GIS) data ZIP file. Winzip or 7zip 20.3 https://coastal.er.usgs.gov/data-release/doi-P9I2T4ZE/data/2023-310-FA_gis.zip None This shapefile was created for use with Esri ArcGIS 10.8 software. It may also be viewed with QGIS (https://www.qgis.org/en/site/, 2023), GeoMapApp 3.6.15 (https://www.geomapapp.org, 2023), or other GIS software capable of importing the data. 20240129 U.S. Geological Survey Arnell S. Forde Geologist Mailing and physical

600 Fourth Street South

St. Petersburg FL 33701 USA 727-502-8000 aforde@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998