These files, which are located in 2022-312-FA_nav.zip (Forde and others, 2023), represent the June 2022 subbottom navigation data. The attributes described below are for the survey's shotpoint navigation file, 2022-312-FA_nav.csv. For detailed information specific to the ArcGIS data, please see the associated shapefile metadata.
(Source: U.S. Geological Survey)
- UTMX
- UTM-X coordinate (Zone 16N)
(Source: Universal Transverse Mercator Coordinate System)
| Range of values |
|---|
| Minimum: | 624446.844 |
|---|
| Maximum: | 647594.783 |
|---|
| Units: | meters |
|---|
- UTMY
- UTM-Y coordinate (Zone 16N)
(Source: Universal Transverse Mercator Coordinate System)
| Range of values |
|---|
| Minimum: | 3322300.917 |
|---|
| Maximum: | 3336130.865 |
|---|
| Units: | meters |
|---|
- Line
- Trackline name
(Source: U.S. Geological Survey)
Line numbers were assigned by the EdgeTech 3400 chirp topside unit during data acquisition and are composed of the FAN, DOY, and trackline number. The naming convention used for each subbottom line is as follows: x_env, where 'x' is an alphanumeric number indicating a specific trackline (for example, 2022_312_FA_171_001) and 'env' denotes that the seismic traces were output as an envelope. Four track lines were manually assigned and do not follow this convention. For these files, the DOY information is excluded from the line number (for example, 2022_312_FA_001b_env). 26 test and “tie” lines (perpendicular tracklines crossing two parallel lines) also deviate from the previously described naming convention and have names such as, 2022_312_FA_172_014testDv5_env and 2022_312_FA_171_004tie_env.
- Shot
- Shotpoint number
(Source: U.S. Geological Survey)
| Range of values |
|---|
| Minimum: | 1 |
|---|
| Maximum: | 23566 |
|---|
- Lon
- Longitude (decimal degrees)
(Source: World Geodetic System 1984 Geographic Coordinate System)
| Range of values |
|---|
| Minimum: | -85.708144 |
|---|
| Maximum: | -85.469306 |
|---|
| Units: | decimal degrees |
|---|
- Lat
- Latitude (decimal degrees)
(Source: World Geodetic System 1984 Geographic Coordinate System)
| Range of values |
|---|
| Minimum: | 30.022867 |
|---|
| Maximum: | 30.149756 |
|---|
| Units: | decimal degrees |
|---|
- YEAR
- Year of data acquisition
(Source: U.S. Geological Survey)
| Range of values |
|---|
| Minimum: | 2022 |
|---|
| Maximum: | 2022 |
|---|
- 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 2022-312-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 (224 files). These files have a .sgy extension and range in size from 1.2 to 228.9 megabytes. These data are included in the download file, 2022-312-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. 0 format (Barry and others, 1975) 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 (224 files) and are included in the download file, 2022-312-FA_seisimag.zip (Forde and others, 2023).
Entity_and_Attribute_Overview:
GIS file: The GIS data associated with this survey are provided as a compressed zip file, 2022-312-FA_gis.zip (Forde and others, 2023), 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.
