USGS Cruise DIAN 97032 Long Island, NY Inner Shelf -- Fire Island Boomer and Sparker Field Navigation Data and Shotpoint Maps
Click on one of the five survey areas for a more detailed
map and to access the seismic image files.
Area 1: Lines 1-10, 73-85 | Area
2: 66-72, 87-91, 95-101
Area3: 11-20, 22-28, 57-65, 92-94, 108, 141-148, 173
Area 4: 29-47, 49-56, 109, 131, 140, 149-159, 172
Area 5: 48, 110-111, 114-118, 121-130, 132-139, 160-174
Shot Navigation Data:
|The navigation is stored in ASCII
files using eight fields separated by commas.
- 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
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
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.
- Field 1: date and time (julian day:hour (GMT):minute:second)
- Field 2: Latitude (decimal degrees)
- Field 3: Longitude (decimal degrees)
- Field 4: Speed (in knots, computed from the navigation)
- Field 5: Heading (in degrees, computed from the navigation, i.e.
course made good)
- Field 6: Water Depth (derived from a Furuno digital echo sounder).
Depths are in meters, but have not been corrected for the depth of the transducer,
which was about 1 m below the sea surface