U.S. Geological Survey Data Series 242

Navigation Data and Maps


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Trackline Maps

Trackline maps were created with ESRI ArcGIS 9.0 software, 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 CRUISENAV folder. The navigation data used to create these maps have not been corrected for the offset between the shotpoint and GPS antenna (see fig. 1). For more information about the GIS project, refer to the Software page.

The trackline maps contain links to interactive profiles, printable profiles, and line navigation maps. The line navigation maps, which have been corrected for the GPS offset, were created with CTI SonarWeb software and are stored in the LINENAV folder. Refer to the Profiles page for more information about the interactive and printable profiles.

NOTE: Although data were collected in UTM Zones 15 and 16, all equipment and data processing were set to Zone 15 for this cruise.

Full Survey Area Map
Area A (05c01_a-05c13_b)
Area B (05c14-05c21)


Processed Shotpoint Navigation

Shotpoint navigation files and 1000-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://www.remotesensing.org/proj) to generate latitude and longitude from UTMs and reformatted for use with ESRI GIS software. The processed navigation data have not been corrected for the offset between the shotpoint and GPS antenna (see fig. 1).

The processed shotpoint navigation and 1000-shot-interval location files can be accessed through the links provided below or from within the NAV folder. Each ASCII text file contains eight fields separated by commas and defined as follows:

Field 1: Longitude (decimal degrees)
Field 2: Latitude (decimal degrees)
Field 3: Trackline Number
Field 4: Shotpoint Number
Field 5: UTM X (Zone 15)
Field 6: UTM Y (Zone 15)
Field 7: Year
Field 8: Day of Year:Hour:Minute:Second (UTC)

Processed Shotpoint Navigation

Processed 1000-Shot-Interval Location Navigation


Raw Shotpoint 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. These navigation data have not been corrected for the offset between the shotpoint and GPS antenna (see fig. 1). Each file contains six fields separated by a space and defined as follows:

Field 1: Trackline Number
Field 2: Shotpoint Number
Field 3: UTM X (Zones 15 and 16)
Field 4: UTM Y (Zones 15 and 16)
Field 5: Year
Field 6: Day of Year:Hour:Minute:Second (UTC)


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