SEISMIC SHOT NAVIGATION DATA

The sub-directory rawnav, under the directory nav, contains theRAW 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 as tabular ASCII files or as standard SEG-P1 format files.   The ASCII files consist of eight fields separated by commas. These files are located in the shotnav sub-directory, under the nav directory..

• 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:Minute:Second

Shotpoint Maps:
Dumpsite Area Map: Lines 1-25, 30-31, 111-113
Mosaic Area  Map: Lines 26-29, 32-110

Shotpoint Navigation Files (ASCII):
Dumpsite Area Shot Navigation: Lines 26-29, 30-31, 111-113
Mosaic Area Shot Navigation: Lines 26-29, 32-110

Shotpoint SEG-P1 Files:
Dumpsite SEG-P1: Lines 26-29, 30-31, 111-113
Mosaic SEG-P1: Lines 26-29, 32-110

Return to USGS Cruise ALPH 98013 index page.