USGS Cruise DIAN 97032 Long Island, NY Inner Shelf -- Fire Island Chirp Field Navigation Data & Shotpoint Maps


Click on one of the five survey areas for a more detailed map and to access the seismic image files.

navigation map


Area 1: Lines 1-10, 73-86 | Area 2: Lines 66-72, 87-91, 95-102, 105, 174-175
Area 3: Lines 11-28, 57-65, 92-94, 103-104, 106-108, 141-148, 173
Area 4: Lines 29-47, 49-56, 109, 131, 140, 149-159, 172 | Area 5: Lines 48, 110-130, 132-139, 160-171


Shotpoint Navigation Data

The navigation is stored in ASCII files using eight fields separated by tabs.
  • Field 1: Longitude
  • Field 2: Latitude
  • Field 3: Line Number
  • Field 4: Shot Number
  • Field 5: UTM Zone 17 Easting
  • Field 6: UTM Zone 17 Northing
  • Field 7: Year
  • Field 8: Julian Day:Hr:Min:Sec
Shotpoint Navigation Files (ASCII):

Area 1 | Area 2 | Area 3 | Area 4 | Area 5

Shotpoint Maps:

Area 1 | Area 2 | Area 3 | Area 4 | Area 5


Raw Navigation Data

The raw navigation was collected  using a USGS differential GPS system (Ashtech). These files represent the data that was originally recorded on floppy disk aboard ship. The data are in NEMA format. WARNING: These data have not been checked for errors. Use with caution.

To aid viewing of the original raw navigation data, each data entry was reformatted (removing the NEMA codes) by filtering the raw data files through a UNIX awk script.. Every navigation fix from the original data has been preserved however.

The navigation is stored in ASCII files using six fields separated by tabs, with each file representing a separate julian day (i.e. feb04.txt). Navigation fixes are at 10 second intervals. The start and end of each line is marked within each reformatted navigation file.
Download Files (click on the Julian Day):
Julian Day: 270 | 271 | 274 | 275 | 276 | 277 | 278 | 279 | 280 | 282 | 283 | 284 | 285 | 286 | 287 | 288 | 289 | 290
area5 area4 area3 area2 area1 area1 area2 area3 area4 area5