These files, which are located in 2022-309-FA_nav.zip (Forde and others, 2023), represent the April–May 2022 subbottom navigation data. The attributes described below are for the survey's shotpoint navigation file, 2022-309-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 18N)
(Source: Universal Transverse Mercator Coordinate System)
| Range of values |
|---|
| Minimum: | 518943.03 |
|---|
| Maximum: | 527220.215 |
|---|
| Units: | meters |
|---|
- UTMY
- UTM-Y coordinate (Zone 18N)
(Source: Universal Transverse Mercator Coordinate System)
| Range of values |
|---|
| Minimum: | 4317778.728 |
|---|
| Maximum: | 4328613.674 |
|---|
| Units: | meters |
|---|
- Line
- Trackline name
(Source: U.S. Geological Survey)
Line numbers were automatically assigned by the EdgeTech 512i chirp topside unit during data acquisition and are composed of a 3-digit HYPACK trackline number and a 4-digit timestamp corresponding to the line's start time. The naming convention used for each subbottom line is as follows: x_env_bp, where 'x' is a 7-digit number indicating a specific trackline (for example, 002_1741) and 'env_bp' denotes that the seismic traces were output as an envelope and a bandpass filter was applied. A transit line (029_2041_transit_env_bp) had its file name manually entered and therefore did not follow the aforementioned convention.
- Shot
- Shotpoint number
(Source: U.S. Geological Survey)
| Range of values |
|---|
| Minimum: | 1 |
|---|
| Maximum: | 28750 |
|---|
- Lon
- Longitude (decimal degrees)
(Source: World Geodetic System 1984 Geographic Coordinate System)
| Range of values |
|---|
| Minimum: | -74.781167 |
|---|
| Maximum: | -74.685219 |
|---|
| Units: | decimal degrees |
|---|
- Lat
- Latitude (decimal degrees)
(Source: World Geodetic System 1984 Geographic Coordinate System)
| Range of values |
|---|
| Minimum: | 39.008794 |
|---|
| Maximum: | 39.106286 |
|---|
| 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 2022-309-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 (54 files). These files have a .sgy extension and range in size from 1.8 to 70.8 megabytes. These data are included in the download file, 2022-309-FA_segy.zip, 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 (54 files) and are included in the download file, 2022-309-FA_seisimag.zip.
Entity_and_Attribute_Overview:
GIS file: The GIS data associated with this survey are provided as a compressed zip file, 2022-309-FA_gis.zip (Forde and others, 2023), which is composed of an Esri map document, shapefiles, individual shapefile metadata, a Google Earth 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.
