These files, which are located in 2023-310-FA_nav.zip (Forde and others, 2023), represent the May 2023 subbottom navigation data. The attributes described below are for the survey's shotpoint navigation file, 2023-310-FA_nav.csv., which contains all the unique shot navigation fixes including the minimum and maximum range of values. 2023-310-FA_1000sht.csv represents the 1000th shot interval and has the same attribute definitions as the shot navigation but different ranges of values not represented here. Not all lines have a record, since some of the data are less than 1000 shots. 2023-310-FA_sol represents the navigation fix for the start of each seismic line and also with the same attribute definition as the survey navigation – but different ranges of values not represented here. For detailed information specific to the ArcGIS data, please see the associated shapefile metadata.
(Source: U.S. Geological Survey)
- UTMX
- UTM-X coordinate (Zone 4N)
(Source: Universal Transverse Mercator Coordinate System)
| Range of values |
|---|
| Minimum: | 624877.207 |
|---|
| Maximum: | 632135.187 |
|---|
| Units: | meters |
|---|
- UTMY
- UTM-Y coordinate (Zone 4N)
(Source: Universal Transverse Mercator Coordinate System)
| Range of values |
|---|
| Minimum: | 2368011.318 |
|---|
| Maximum: | 2372055.082 |
|---|
| Units: | meters |
|---|
- Line
- Trackline name
(Source: 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
(Source: U.S. Geological Survey)
| Range of values |
|---|
| Minimum: | 1 |
|---|
| Maximum: | 5997 |
|---|
- Lon
- Longitude (decimal degrees)
(Source: World Geodetic System 1984 Geographic Coordinate System)
| Range of values |
|---|
| Minimum: | -157.795000 |
|---|
| Maximum: | -157.724867 |
|---|
| Units: | decimal degrees |
|---|
- Lat
- Latitude (decimal degrees)
(Source: World Geodetic System 1984 Geographic Coordinate System)
| Range of values |
|---|
| Minimum: | 21.409567 |
|---|
| Maximum: | 21.446094 |
|---|
| Units: | decimal degrees |
|---|
- YEAR
- Year of data acquisition
(Source: U.S. Geological Survey)
| Range of values |
|---|
| Minimum: | 2023 |
|---|
| Maximum: | 2023 |
|---|
- DOY:HR:MIN:SEC
- Day of year:hour:minute:second
(Source: U.S. Geological Survey)
Day of year, hour, minute and second of data acquisition, in Coordinated Universal Time (UTC).
Entity_and_Attribute_Overview:
Navigation file: Navigation files are available as ASCII delimited text files in comma-separated values file 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.
Entity_and_Attribute_Overview:
Binary data file: Seismic trace data are available as binary files in SEG-Y format (81 files). These files have a .sgy extension and range in size from 1.4 to 57 megabytes. These data are included in the download file, 2023-310-FA_segy.zip (Forde and others, 2023), and can also be found by going to the USGS CMGDS at,
https://cmgds.marine.usgs.gov. The SEG-Y rev. 1 format (Norris and others, 2002) data presented here consists of the following: a 3,600-byte reel identification header, with the first 3,200 bytes consisting of an ASCII header block followed by a 400-byte binary header block, both of which include information specific to line and reel number; a trace data block that follows the reel identification header, with the first 240 bytes of each trace block consisting of the binary trace identification header; and seismic data samples that follow the trace identification header.
Graphic image file: Printable versions of the processed subbottom profiles are available as GIF images (81 files) and are included in the download file, 2023-310-FA_seisimag.zip (Forde and others, 2023).
Entity_and_Attribute_Overview:
GIS file: The GIS data associated with this survey are provided in Forde and others (2023) as a compressed zip file, 2023-310-FA_gis.zip, which is composed of an Esri map document, shapefiles, individual shapefile metadata, a Google Earth Keyhole Markup Language Zipped (KMZ) file, a folder of processed subbottom profile images, and a readme file.
Entity_and_Attribute_Detail_Citation:
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.
