Santa_Rosa_Island_2021_SBES_xyz: Single-Beam Bathymetry Data Collected During USGS Field Activity Number 2021-322-FA Offshore of Santa Rosa Island, Florida

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?
• How reliable are the data; what problems remain in the data set?
  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   DeWitt, Nancy T., 20220503, Santa_Rosa_Island_2021_SBES_xyz: Single-Beam Bathymetry Data Collected During USGS Field Activity Number 2021-322-FA Offshore of Santa Rosa Island, Florida:.

   This is part of the following larger work.
   Forde, Arnell S., DeWitt, Nancy T., and Flocks, James G., 20220503, Archive of Chirp Subbottom Profile and Single-Beam Bathymetry Data Collected in 2021 From Santa Rosa Island, Florida: U.S. Geological Survey data release doi:10.5066/P9VRSD9J, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

   Online Links:

   • https://doi.org/10.5066/P9VRSD9J

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -87.361991
   East_Bounding_Coordinate: -87.169212
   North_Bounding_Coordinate: 30.341329
   South_Bounding_Coordinate: 30.272591
   

3. What does it look like?
4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 02-Jun-2021

   Ending_Date: 09-Jun-2021

   Currentness_Reference:

   ground condition

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: tabular digital data
   

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?
      This is a Point data set.
   2. What coordinate system is used to represent geographic features?
      

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:

      UTM_Zone_Number: 16
      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -87.000000
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000.0
      False_Northing: 0.0
      

      Planar coordinates are encoded using Coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.1
      Ordinates (y-coordinates) are specified to the nearest 0.1
      Planar coordinates are specified in meter
      The horizontal datum used is World Geodetic System of 1984.
      The ellipsoid used is WGS_84.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
      

      Vertical_Coordinate_System_Definition:

      Altitude_System_Definition:

      Altitude_Datum_Name: World Geodetic System of 1984
      Altitude_Resolution: 0.001
      Altitude_Distance_Units: meter
      Altitude_Encoding_Method: Attribute values
      

7. How does the data set describe geographic features?

   Santa_Rosa_Island_2021_SBES_WGS84_UTM16N_xyz.txt

   ASCII text file containing the processed single-beam bathymetry x,y,z point data in the World Geodetic System of 1984 (WGS84) realization G1762 and Universal Transverse Mercator (UTM) Zone 16 North (N). (Source: USGS)

   WGS84_UTM16N_X

   WGS84(G1762) X-coordinate (easting) of sample point, in meters (Source: CARIS)

   Range of values
   Minimum:	465195.459
   Maximum:	483731.141

   WGS84_UTM16N_Y

   WGS84(G1762) Y-coordinate (northing) of sample point, in meters (Source: CARIS)

   Range of values
   Minimum:	3349031.006
   Maximum:	3356623.084

   Ellipsoid

   WGS84(G1762) ellipsoid height of sample point, in meters (Source: CARIS)

   Range of values
   Minimum:	-50.625
   Maximum:	-30.837

   WGS84_Lat

   WGS84(G1762) latitude coordinate of sample point, in decimal degrees (DD) (Source: CARIS)

   Range of values
   Minimum:	30.272591
   Maximum:	30.341329

   WGS84_Long

   WGS84(G1762) longitude coordinate of sample point, in decimal degrees (DD) (Source: CARIS)

   Range of values
   Minimum:	-87.361991
   Maximum:	-87.169212

   Year

   The year the data were collected (Source: USGS)

   Range of values
   Minimum:	2021
   Maximum:	2021

   DOY

   Day of year (Source: USGS)

   Range of values
   Minimum:	154
   Maximum:	157

   Time

   The time of the sample point in Coordinated Universal Time in HH:MM:SS.sss (Source: CARIS)

   Range of values
   Minimum:	13:37:39.605
   Maximum:	22:25:01.380

   HYPACK_Line

   Trackline name (Source: HYPACK version 2021) Trackline names (numbers, text, or combination) are based upon the planned tracklines created in the HYPACK program. Once the trackline is activated during acquisition, HYPACK assigns a time stamp. Trackline naming conventions for this dataset are "####_hhmm" or "inshore####_hhmm", where the first four digits are the line number, inshore designates behind the barrier island, and the last four digits indicate trackline start time in hours (hh) and minutes (mm).

   Santa_Rosa_Island_2021_SBES_NAD83_NAVD88_G12A_xyz.txt

   ASCII text file containing the processed single-beam bathymetry x,y,z point data in the North American Datum 1983 (NAD83), Universal Transverse Mercator (UTM) Zone 16 North (N) and the North American Vertical Datum 1988 (NAVD88) with respect to the GEOID12A model. (Source: VDatum version 4.3)

   NAD83_UTM16N_X

   NAD83 X-coordinate (easting) of sample point, in meters (Source: VDatum version 4.3)

   Range of values
   Minimum:	465195.9326
   Maximum:	483731.61183

   NAD83_UTM16N_Y

   NAD83 Y-coordinate (northing) of sample point, in meters (Source: VDatum version 4.3)

   Range of values
   Minimum:	3349030.3167
   Maximum:	3356622.394

   NAVD88_G12A

   The Z-coordinate in the North American Vertical Datum of 1988, GEOID12A (orthometric height) of sample point, in meters (Source: VDatum version 4.3)

   Range of values
   Minimum:	-21.777
   Maximum:	-2.047

   NAD83_Lat

   NAD83 latitude-coordinate of sample point, in decimal degrees (Source: VDatum version 4.3)

   Range of values
   Minimum:	30.272591
   Maximum:	30.341329

   NAD83_Long

   NAD83 longitude-coordinate of sample point, in decimal degrees. (Source: VDatum version 4.3)

   Range of values
   Minimum:	-87.361991
   Maximum:	-87.169212

   Year

   The year the data were collected (Source: USGS)

   Range of values
   Minimum:	2021
   Maximum:	2021

   DOY

   Day of year (Source: USGS)

   Range of values
   Minimum:	154
   Maximum:	157

   Time

   The time of the sample point in Coordinated Universal Time in HH:MM:SS.sss (Source: CARIS)

   Range of values
   Minimum:	13:37:39.605
   Maximum:	22:25:01.380

   HYPACK_Line

   Trackline name (Source: HYPACK version 2021) Trackline names (numbers, text, or combination) are based upon the planned tracklines created in the HYPACK program. Once the trackline is activated during acquisition, HYPACK assigns a time stamp. Trackline naming conventions for this dataset are "####_hhmm" or "inshore####_hhmm", where the first four digits are the line number where inshore designates behind the barrier island, and the last four digits indicate trackline start time in hours (hh) and minutes (mm).

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Nancy T. DeWitt
2. Who also contributed to the data set?
   U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center
3. To whom should users address questions about the data?
   Nancy T. DeWitt

   U.S. Geological Survey St. Petersburg Coastal and Marine Science Center

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   (727) 502-8000 (voice)

   ndewitt@usgs.gov

Why was the data set created?

How was the data set created?

1. From what previous works were the data drawn?
2. How were the data generated, processed, and modified?

   Date: 2021 (process 1 of 5)

   Acquisition: A single-beam bathymetry survey was conducted in June 2021 aboard the R/V Sallenger, a 26-foot (ft) fiberglass research vessel outfitted with an ODOM CV100 echo sounder system with a 200 kilohertz (kHz) transducer for depth, an Applanix POS MV Wavemaster II V5 inertially aided navigation system (IANS) for timing, positioning, and attitude, and a Sontek CastAway Conductivity, Temperature, and Depth (CTD) sensor was used to measure sound velocity profiles. The ODOM echosounder and the Applanix Inertial Measurement Unit (IMU) were mounted in line vertically to a mounting pole on the starboard gunnel. The IMU was mounted above the sonar and was the center of reference point (0.00 mmeters [m]) for all the sensors used in this survey. When the pole was deployed, the instruments were approximately 1-m below the water surface. The topside part of the Applanix POS MV consisted of two Trimble GA830 Global Navigation Satellite System (GNSS) antennas that were affixed atop the cabin approximately amidships of the vessel, two meters apart, port-starboard (secondary antenna and primary antenna respectively for the R/V Sallenger) and all cables ran into their respective topside control boxes within the cabin. HYPACK version 2021.0.2 hydrographic acquisition and processing software managed incoming sensor data. All sensor data strings were referenced with a device identification code, time stamped to Coordinated Universal Time (UTC), and saved into a single raw (.RAW) data file. Sound velocity measurements were collected using Sontek Castaway CTD units to record changes in water column speed of sound (SOS). CTD profiles were collected based on time and space with inclusions for shallow water, deep water, offshore, inshore, and channel areas. Data were collected in WGS84 [G1762] Universal Transverse Mercator (UTM) Zone 16 North (N) coordinates and WGS84 ellipsoid height. Person who carried out this activity:
   

   Nancy T. DeWitt

   U.S. Geological Survey St. Petersburg Coastal and Marine Science Center

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   (727) 502-8000 (voice)

   ndewitt@usgs.gov

   Data sources produced in this process:

   • HYPACK version 2021 raw data files (.RAW), HYPACK version 2021 target files (.tgt), and SVP files (.txt, *.csv, *.svp).

   Date: 2021 (process 2 of 5)

   Navigation processing: Positioning and attitude data files from the Applanix POS-MV Wave Master II V5 were post-processed in Applanix POSPac (POSPac) Mobile Mapping Suite (MMS) software version 8.6. Raw position files from the POS MV were imported into POSPac and processed with the IN-Fusion PP-RTX processing mode utilizing Trimble CenterPoint RTX technology, creating smoothed best estimate of trajectory (.sbet) files and dynamic error files (.smrsmg) for each day of the survey. Data file recording was automated and preset to a maximum file size of 12 megabytes (MB) before opening a new file. File extensions for each survey day started with *.000 and incremented sequentially (*.001, *.002) until recording stopped. File naming convention was 2021_154_USB.000 where 2021 is the year, 154 is the Day of Year (DOY), USB is the digital media storage used, and .000 is file extension as previously described. Person who carried out this activity:
   

   Nancy T. DeWitt

   U.S. Geological Survey St. Petersburg Coastal and Marine Science Center

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   (727) 502-8000 (voice)

   ndewitt@usgs.gov

   Data sources used in this process:

   • Raw Applanix data files 2021_154_USB.000 - *.056; 2021_155_USB.000 - *.061; 2021_156_USB.000 - *.043; 2021_156b_USB.000 - *.020; 2021_157_USB.000 - *.065.

   Data sources produced in this process:

   • One set of files (*.sbet, and *.smrmsg) for each survey day.

   Date: 2021 (process 3 of 5)

   Single-beam bathymetry processing: Bathymetric data were post-processed in CARIS Hydrographic processing software HIPS/SIPS version 11.3.6. First, a vessel file specific to the R/V Sallenger equipment offsets and equipment specifications was created (*.vhf) in the "Vessel Editor" application. Next, the HYPACK acquisition files (.RAW), the post-processed navigation files (.sbet and . smrmsg), and the sound velocity profiles (.svp) were imported into CARIS. The bathymetric data components (position, motion, depth, and SOS) were geometrically corrected using the "Georeference Bathymetry Tool" to produce processed XYZ data. Additionally, during this process, the Global Positioning System (GPS) tide component (GPS tidal corrections utilize GPS height information from real time survey observations to obtain an ellipsoid height) was computed and were applied to the data. Next, a loosely defined moving average filter was applied line by line to reduce noisy and erroneous data points. A visual and statistical inspection of the data was further performed in the Subset Editor 2-Dimensional (D) and 3-D utility for crossing status agreements and any questionable areas. The dataset was exported as an XYZ American Standard Code for Information Interchange (ASCII) file using the CARIS HIPS and SIPS Data Export HIPS to ASCII function as WGS84 (G1762) UTM Zone 16N and ellipsoid height in meters. Person who carried out this activity:
   

   Nancy T. DeWitt

   U.S. Geological Survey St. Petersburg Coastal and Marine Science Center

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   (727) 502-8000 (voice)

   ndewitt@usgs.gov

   Data sources used in this process:

   • Post-processed differential navigation data files (*.sbet, and *.smrmsg) in binary format, HYPACK data files (*.RAW), and SVP files (*.svp) both in ASCII text format.

   Data sources produced in this process:

   • XY2021-322-FA-Pensacola_2.txt

   Date: 2021 (process 4 of 5)

   Single-beam bathymetry error analysis: The ASCII file described in the previous step was imported into ArcMap version 10.8.1 and two shapefiles were created. One shapefile was created to display the data points, the second shapefile was created using the XTools Pro "Polylines from Points" ArcScript to display the tracklines. An Esri ArcMap add-in script using an inverse distance weighted equation was written locally, by a USGS staff member to evaluate the elevation differences at the intersection of crossing lines. The script uses the point and trackline shapefiles concurrently and produces another shapefile with the results. If discrepancies were found at a crossing, the source of the discrepancy was identified and, if needed, the line or segment of data points in error was statically adjusted, removed, or reprocessed. This crossing program was reiterated to produce a final numerical assessment of the crossing range for the SBB dataset. Results from 159 crossings report the minimum is 0.00 m, the maximum is 0.13 m, and a standard deviation of 0.02. Crossing values > 0.15 m = 0% and crossing values > 0.10 = 1%. Person who carried out this activity:
   

   Nancy T. DeWitt

   U.S. Geological Survey St. Petersburg Coastal and Marine Science Center

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   (727) 502-8000 (voice)

   ndewitt@usgs.gov

   Data sources used in this process:

   • 2021-322-FA-Pensacola_2.txt

   Data sources produced in this process:

   • XY2021-322-FA-Pensacola_2.shp XY2021-322FAPensacola_2_PolylinesFromPoints.shp 2021-322-Pensacola_crossing1.shp Santa_Rosa_Island_2021_SBES_WGS84_UTM16N_xyz.txt

   Date: 2022 (process 5 of 5)

   VDatum version 4.3 transformation: The xyz point dataset was also converted from WGS84_UTM16N into NAD83(2011) and NAVD88 (orthometric height) with respect to GEOID 12A with a vertical uncertainty reported for this transformation of 0.0605876 m. The reported maximum cumulative uncertainty for the Florida - Perdido, Pensacola and Choctawhatchee Bays VDatum region (https://vdatum.noaa.gov/docs/est_uncertainties.html#estTransform) is 8.3 centimeters (cm). Person who carried out this activity:
   

   U.S. Geological Survey

   Attn: Nancy T. DeWitt

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   U.S.

   (727) 502-8000 (voice)

   ndewitt@usgs.gov

   Data sources used in this process:

   • Santa_Rosa_Island_2021_SBES_WGS84_UTM16N_xyz.txt

   Data sources produced in this process:

   • Santa_Rosa_Island_2021_SBES_NAD83_NAVD88_G12A_xyz.txt

3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?
   These datasets are from a single research cruise aboard the R/V (Research Vessel) Sallenger, in June 2021, USGS FAN 2021-322-FA. The placement of bathymetry survey equipment aboard the Sallenger is consistent per survey. Prior to the survey, the instruments are isolated, and positional offsets (x,y,z) measured to obtain internal offsets (reference between instrument) and external offsets (the vessel reference frame). All instruments are surveyed using a total station for accuracy, in millimeters (mm). During mobilization, equipment mounting points are verified for consistency and durability. Should any structural changes be made, then a new total station survey is performed prior to the cruise. All the measurements are recorded manually and entered digitally into the respective acquisition or processing program. This bathymetry dataset is internally consistent to this vessel and has not been independently verified.
2. How accurate are the geographic locations?
   The navigation for the single-beam bathymetry was collected using the Applanix POS MV Wave Master II. These files were then ported into POSPac Mobile Mapping Suite (MMS) version 8.6 and processed using the Post-Processed CenterPoint RTX (PP-RTX) module. The module allows centimeter (cm) level accuracy without establishing a local base station. The Santa Rosa Island, FL survey is located within the PP-RTX fast region convergence zone in which post-processing standards are reported to be 3 cm in the horizontal.
3. How accurate are the heights or depths?
   The navigation for the single-beam bathymetry was collected using the Applanix POS MV Wave Master II. These files were then ported into POSPac Mobile Mapping Suite (MMS) version 8.6 and processed using the Post-Processed CenterPoint RTX (PP-RTX) module. The module allows centimeter level accuracy without establishing a local base station. The Santa Rosa Island survey is located within the PP-RTX fast region convergence zone in which post-processing standards are reported to be 6 cm in the vertical.
4. Where are the gaps in the data? What is missing?
   Approximately 219 line-kilometers (km; (35 tracklines) of single-beam bathymetry data was collected successfully, and produced 1,740,483 processed x,y,z data points.
5. How consistent are the relationships among the observations, including topology?
   These datasets are post-processed single-beam bathymetric data points (XYZ) from USGS FAN 2021-322-FA with internal system measurements and calibrations.

How can someone get a copy of the data set?

1. Who distributes the data set? (Distributor 1 of 1)
   
   Nancy T. DeWitt

   U.S. Geological Survey St. Petersburg Coastal and Marine Science Center

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   (727) 502-8000 (voice)

   ndewitt@usgs.gov
2. What's the catalog number I need to order this data set? Santa_Rosa_Island_2021_SBES_WGS84_UTM16N_xyz.txt, Santa_Rosa_Island_2021_SBES_NAD83_NAVD88_G12A_xyz.txt
3. What legal disclaimers am I supposed to read?
   This publication was prepared by an agency of the United States Government. Although these data were processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
4. How can I download or order the data?
   • Availability in digital form:

     Data format:	ASCII Size: 49.7
     Network links:	https://coastal.er.usgs.gov/data-release/doi-P9VRSD9J/data/Santa_Rosa_Island_2021_SBES_xyz.zip

   • Cost to order the data: none

5. What hardware or software do I need in order to use the data set?
   The ASCII text files contained in the .zip archives can be accessed with any standard text file reader.

Who wrote the metadata?

Dates:

Last modified: 03-May-2022

Metadata author:

Nancy T. DeWitt

U.S. Geological Survey St. Petersburg Coastal and Marine Science Center

Geologist

600 4th Street South

St. Petersburg, FL

USA

(727) 502-8000 (voice)

ndewitt@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)