U.S. Geological Survey, 2007, SEISMICLINES- Survey Lines along which seismic data were collected aboard R/V RAFAEL (field activities 05001 and 06001) in Apalachicola Bay, FL: Open-File Report 2006-1381, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.This is part of the following larger work.Online Links:
Twichell, David C. , Andrews, Brian D. , Edmiston, H. Lee , and Stevenson, William R. , 2007, Geophysical Mapping of oyster habitats in a shallow estuary; Apalachicola Bay, Florida: Open-File Report 2006-1381, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000000. Longitudes are given to the nearest 0.000000. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_1984.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257224.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
| Value | Definition |
|---|---|
| 1 | USGS field activity 05001 conducted in 2005 |
| 2 | USGS field activity 06001 conducted in 2006 |
| Value | Definition |
|---|---|
| 1 | USGS Research Vessel RAFAEL |
| Value | Definition |
|---|---|
| 3 | EdgeTech FSSB-424 chirp profiles (4-24 kHz) |
| 5 | Knudsen 320b chirp system (3.5-12 kHz) |
508-548-8700 x2348 (voice)
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bandrews@usgs.gov
This shapefile represents the trackline along which seismic profile data collected aboard the R/V RAFAEL during USGS field activities 05001 and 06001 in Apalachicola Bay and St. George Sound, Florida. The seismic data that were collected from the R/V RAFAEL were acquired differently in 2005 than in 2006. During the first seven survey days of the 2005 field season (Julian days 076-083) a Knudsen 320 b chirp profiler (3.5-12 kHz) was used and during the remaining part of the 2005 season a towed Edgetech FSSB 424 (2-24 kHz) system was used. In 2006, the Edgetech FSSB 424 was used for the entire field season, but it was mounted on a pole rather than being towed on a cable. In 2005 both the Knudsen and Edgetech seismic data were logged in SEG-Y format using Delph Seismic +. In 2006 the Edgetech seismic data were logged in SEG-Y format using SBLogger. The purpose of these data is to manage the filenames and geographic locations of seismic profile images that are hyperlinked to each trackline.
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Person who carried out this activity:
508-548-8700 x 2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
RTK GPS was used to navigate the seismic-reflection systems. The GPS antenna was mounted over the bathymetric sonar and a layback of 4 meters was used for the seismics.
Navigation was recorded to all data acquisition systems using Real Time Kinematic GPS at a one second interval.
Horizontal accuracy of the navigation is assumed to be +/- 1 meter. The shot point file and survey line file for the
seismic data are both derived from the same navigation file that was logged by the seismic acquisition system, but
because the two were processed differently, the shot points do not always fall directly on the survey line. To create
the shot point file, the navigation was queried to extract every 500th point starting with shot point 500. By
contrast, to create the survey line file, the navigation was queried at a one minute interval (every 60th point), and
then a line was drawn using these points. Because of the different processing approaches, many of the shot points,
although close, do not fall exactly on the survey line. If meter accuracy is truely needed, it would be best to
extract the navigation from the archived SEG-Y seismic files.
Sections of tracklines where seismic data were not logged were deleted
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- These data should not be used at resolutions for which they are not intended.
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Downloadable Data
Although this data set has been used by the U.S. Geological Survey (USGS), no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
| Data format: | Trackline navigation for seismic-reflection profiles in format SHP (version ArcGIS 9.2) ESRI polyline shapefile Size: 30 |
|---|---|
| Network links: |
<http://pubs.usgs.gov/of/2006/1381/GIS/shapefiles/SeismicLines.zip> |
| Media you can order: |
DVD-ROM
(Density 4.75
Gbytes)
(format UDF)
|
The data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS or ArcView 3.3 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com.
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
