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U.S. Geological Survey Data Series 237
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Navigation Data and Maps


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Trackline Maps

Trackline maps were generated with ESRI ArcView 3.3 and ArcGIS 8.3 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 figs. 1 and 2). For more information about the GIS project, refer to the Software page.

The trackline maps on the following pages 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 by equipment type. For details about the interactive and printable profiles, see the Profiles page.

Table 3A lists the lines that appear on each of the boomer trackline maps, and table 3B lists lines that appear on each of the chirp trackline maps.

Boomer Map

Chirp Map


Edited Shotpoint Navigation

Shotpoint navigation files and 500- or 1,000-shot-interval location files were extracted from the trace headers of each line using Seismic Unix software and edited to remove or correct spurious data points. 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 edited navigation data have not been corrected for the offset between the shotpoint and GPS antenna (see figs. 1 and 2).

Edited navigation can be accessed through the links provided below or from within the NAV folder. Edited shotpoint navigation files are located in the EDITNAV folder. Edited boomer 500-shot-interval location files and chirp 1,000-shot-interval location files are located in the SHOTNAV 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)

Edited Shotpoint Navigation
Boomer
Chirp

Edited 500- or 1,000-Shot-Interval Location Navigation
Boomer
Chirp


Raw Shotpoint Navigation

Shotpoint navigation files were extracted from the trace headers of each line using Seismic Unix software. Unedited navigation files are stored as ASCII text files in the RAWNAV folder by equipment type. These navigation data have not been corrected for the offset between the shotpoint and GPS antenna (see figs. 1 and 2). 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 (Zone 15)
Field 4: UTM Y (Zone 15)
Field 5: Year
Field 6: Day of Year:Hour:Minute:Second (UTC)

WARNING: These data contain errors and have not been edited.


Home | Acronyms | Contents | Navigation | Profiles | Logs | Metadata | Software