U.S. Geological Survey Data Series 670
Trackline maps were created with ESRI GIS software ArcView 3.3 and ArcGIS 8.3 and 10, exported to Adobe Illustrator for further editing, and saved in JPEG format. These images can be accessed through the links provided below or from within the maps folder. For more information about the GIS project, see the Software page.
Full Survey Area Map
Area A Map
Area B Map
In addition to shotpoint navigation files, 500-shot-interval location files were generated to help locate on the trackline maps features identified in the profiles. Both shotpoint navigation files and 500-shot-interval location files were extracted from the trace headers of each line using Seismic Unix software. These files were then processed with PROJ.4 software (http://trac.osgeo.org/proj) to generate UTM coordinates from latitude and longitude coordinates and reformatted for use with ESRI GIS software. Although the processed navigation data have been edited to remove spurious data points and fix incorrectly recorded dates, they have not been corrected to reflect the unknown offset between the shotpoint and GPS antenna.
The processed shotpoint navigation and 500-shot-interval location files can be accessed through the links below or from the nav folder. Each ASCII text file contains eight fields separated by commas and defined as follows:
Field 1: UTM-X (Zone 17)
Field 2: UTM-Y (Zone 17)
Field 3: Trackline Number
Field 4: Shotpoint Number
Field 5: Longitude (decimal degrees)
Field 6: Latitude (decimal degrees)
Field 7: Year
Field 8: Day of Year:Hour:Minute:Second (GMT)
Processed Shotpoint Navigation
Processed 500-Shot-Interval Location Navigation
Shotpoint navigation files were extracted from the trace headers of each line using Seismic Unix software. Unprocessed navigation files are stored as ASCII text files in the rawnav folder by cruise ID and trackline number. These navigation data have not been corrected to reflect the unknown offset between the shotpoint and GPS antenna. Each file contains six fields separated by a space and defined as follows:
Field 1: Trackline Number
Field 2: Shotpoint Number
Field 3: Longitude (decimal degrees)
Field 4: Latitude (decimal degrees)
Field 5: Year
Field 6: Day of Year:Hour:Minute:Second (GMT)
NOTE: These data contain errors and have not been edited.
