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Data Series 203

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 MAPS 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.

Full Survey Area Map
Area A Map


Edited Shotpoint Navigation

Shotpoint navigation files were extracted from the trace headers of each line using Delph Seismic software and edited to remove spurious data points. These files were then processed with PROJ.4 software (http://www.remotesensing.org/proj) to generate UTMs from latitude and longitude and reformatted for use with ESRI GIS software. The 500-shot-interval location files were extracted from the trace headers using Seismic Unix scripts and processed in the same manner as the shotpoint navigation files. The edited navigation data have not been corrected for the offset between the shotpoint and GPS antenna (see fig. 1).

The edited shotpoint navigation file and edited 500-shot-interval location file 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: 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 (UTC)

Edited Shotpoint Navigation
500-Shot-Interval Location Navigation


Raw Shotpoint Navigation

Shotpoint navigation files were extracted from the trace headers of each line using Delph Seismic software. Unedited 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: Longitude (decimal degrees)
Field 4: Latitude (decimal degrees)
Field 5: Year
Field 6: Day of Year:Hour:Minute:Second (UTC)

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


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