U.S. Geological Survey 2007 1.0 vector digital data Open-File Report 2006-1381 Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts U.S. Geological Survey, Coastal and Marine Geology Program https://doi.org/10.3133/ofr20061381 http://pubs.usgs.gov/of/2006/1381/GIS/shapefiles/SeismicShot500.zip David C. Twichell Brian D. Andrews H. Lee Edmiston William R. Stevenson 2007 1.0 Open-File Report 2006-1381 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/of/2006/1381/ These data were collected under a cooperative mapping program between the U.S. Geological Survey (USGS), the National Oceanic and Atmospheric Administration Coastal Services Center (NOAA\CSC), and the Apalachicola National Estuarine Research Reserve (NERR). The primary objectives of this program were to collect marine geophysical data to develop a suite of seafloor maps to better define the extent of oyster habitats, the overall seafloor geology of the bay and provide updated information for management of this resource. In addition to their value for management of the bay's oyster resources, the maps also provide a geologic framework for scientific research and the public. High-resolution bathymetry, backscatter intensity, and seismic profile data were collected over 230 square kilometers of the floor of the bay. The study focused on the Apalachicola Bay and Western St. George Sound portions of the estuary in mostly in depths > 2.0 meters. These data represent shot navigation at 500 shot intervals for seismic profile data collected during USGS field activities 05001, and 06001 in Apalachicola Bay and the western part of St. George Sound, Florida. These data are used to locate the 500 shot index markers on each seismic profile in geographic space. 20050314 20060627 ground condition of two separate survey times: 20050314 to 20050413 and 20060529 to 20060627 Complete None planned -85.094479 -84.755187 29.782233 29.601953 USGS Metadata Identifier USGS:3d78e232-507c-4ab5-8d95-5d22e04b81eb None U.S. Geological Survey USGS Coastal and Marine Geology Program CMGP Woods Hole Science Center WHSC Seafloor Marine Geology field activity serial number 05001 field activity serial number 06001 Seismic Profile ISO 19115 Topic Category oceans transportation location USGS Thesaurus navigational data marine geophysics geospatial datasets None Apalachicola Bay Florida Apalachicola National Estuarine Research Reserve St. George Sound United States Gulf of Mexico None Seafloor Subsurface sea floor None 2005 2006 None 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. Brian Andrews U.S. Geological Survey Geographer mailing and physical address

384 Woods Hole Rd

Woods Hole MA 02543-1598 USA 508-548-8700 x2348 508-457-2310 bandrews@usgs.gov http://pubs.usgs.gov/of/2006/1381/GIS/thumbnails/SeismicShot500.jpg JPEG image of seismic shots JPEG Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350 RTK GPS was used to navigate the survey platform from which the seismic-reflection data were collected. The GPS antenna was mounted over the bathymetric sonar and a layback of 4 meters was used for the seismic systems. Information unavailable from original metadata. Navigation tracklines for which there was no valid data were deleted. 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. 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. Navigation was extracted from the raw SEG-Y format seismic data and converted to an ASCII text file. The ASCII navigation file was then queried to extract every 500th shot and exported as an ASCII text file. This file was imported to ArcGIS 9.1 and converted to a point feature class. 20070505 Brian Andrews U.S. Geological Survey Geographer mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 USA 508-548-8700 x2348 508-457-2310 bandrews@usgs.gov Exported feature class from personal geodatabase to a shapefile and projected to geographic. 200707 Brian Andrews U. S. Geological Survey Geographer mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x 2348 508-457-2310 bandrews@usgs.gov Edits to the metadata were made to fix any errors that MP v 2.9.32 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The link to the data in the Identification_Information section had to be fixed. The link to the data in the Distribution_Information section had to be fixed. The altitude system definition was incomplete and had to be modified to meet the standard. The value of 9999 in the altitude resolution was entered to indicate that the information was unavailable from the original metadata. Minor fixes to the attribute format for some attributes were needed. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. 20160628 U.S. Geological Survey VeeAnn A. Cross Marine Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov USGS Thesaurus keywords added to the keyword section. 20180720 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Crossref DOI link was added as the first link in the metadata. 20191118 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Added keywords section with USGS persistent identifier as theme keyword. 20200908 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Vector Entity point 6626 0.000001 0.000001 Decimal degrees D_WGS_1984 WGS_1984 6378137.000000 298.257224 Information unavailable from original metadata. 9999 unknown Explicit elevation coordinate included with horizontal coordinates SeismicShot500 Navigation lines seismic reflection data collected from the R/V RAFAEL during USGS field activities 06001 and 05001 USGS FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. Lon Longitude coordinate of shot USGS Information unavailable from original metadata. Lat Latitude coordinate of shot USGS Information unavailable from original metadata. Line Name of survey line USGS Information unavailable from original metadata. Shot The number of the seismic shot in 500 shot intervals USGS Information unavailable from original metadata. UTMX The X coordinate in Universal Transverse Mercator (UTM), meters USGS Information unavailable from original metadata. UTMY The Y Coordinate in Universal Transverse Mercator (UTM), meters USGS Information unavailable from original metadata. YEAR_ Calendar year data were collected USGS Information unavailable from original metadata. JD Julian Day on which data were collected USGS Information unavailable from original metadata. HrMnSec Hour:Minute:Second of shot in UTC (12 hour clock) USGS Information unavailable from original metadata. SurveyID ID used to identify the survey during which the data were collected. It is also used as join field with SurveyInfo Table for relationship class USGS 1 USGS field activity 05001 USGS 2 USGS field activity 06001 USGS Brian Andrews U.S. Geological Survey Geographer mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 USA 508-548-8700 x2348 508-457-2310 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. SHP ArcGIS 9.2 ESRI point shapefile Trackline navigation for seismic reflection profiles zip 0.4 http://pubs.usgs.gov/of/2006/1381/GIS/shapefiles/SeismicShot500.zip Data can be downloaded via the World Wide Web (WWW) DVD-ROM 4.75 Gbytes UDF none 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. 20240318 U.S. Geological Survey Brian Andrews Geographer mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543-1598 USA 508-548-8700 x2348 508-457-2310 whsc_data_contact@usgs.gov The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240318) FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time