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SEISMIC SHOT NAVIGATION DATA

The directory rawnav contains the raw DGPS navigation that was collected using a USGS differential GPS system (Ashtech). These files were extracted from the SEG-Y seismic trace headers for each unique fix available (~ every 5 sec.). WARNING: These data have not been checked for errors. Use with caution.

The navigation is stored in ASCII files using six fields separated by tabs. These files are located in the shotnav.

• Field 1: Longitude
• Field 2: Latitude
• Field 3: Line Number
• Field 4: Shot Number
• Field 5: UTM Zone 18 X
• Field 6: UTM Zone 18 Y
• Field 7: Year
• Field 8: Hour
• Field 9: Minute
• Field 10: Second

Shotpoint Maps:
Dumpsite Area Map: Lines 1-5, 7-12, 14, 18-24, 30-31, 111-113
Mosaic Area Map: Lines 26-29, 32-110

Shotpoint Navigation Files (ASCII):
Dumpsite Area Navigation: Lines 1-5, 7-12, 14, 18-24, 30-31, 111-113
Mosaic Area Shot Navigation: Lines 26-29, 32-110

Shotpoint SEG-P1 Files:
Dumpsite SEG-P1: Lines 1-5, 7-12, 14, 18-24, 30-31, 111-113
Mosaic SEG-P1: Lines 26-29, 32-110

Return to USGS Cruise ALPH 98013 index page.