Nearshore Single-Beam Bathymetry Data: Madeira Beach, Florida, February 2017

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., 20240307, Nearshore Single-Beam Bathymetry Data: Madeira Beach, Florida, February 2017:.

   This is part of the following larger work.
   DeWitt, Nancy T., Fredericks, Joseph J., Stalk, Chelsea A., Reynolds, Billy J., Kelso, Kyle W., Thompson, Dave M., Farmer, Andy, and Brown, Jenna A., 20240307, Nearshore Multibeam and Single-Beam Bathymetry Data: Madeira Beach, Florida, February 2017: U.S. Geological Survey data release doi:10.5066/P9Y7R8NS, U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center, St. Petersburg, Florida.

   Online Links:

   • https://doi.org/10.5066/P9Y7R8NS

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -82.827188
   East_Bounding_Coordinate: -82.776611
   North_Bounding_Coordinate: 27.808530
   South_Bounding_Coordinate: 27.761500
   

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

   Beginning_Date: 14-Feb-2017

   Ending_Date: 17-Feb-2017

   Currentness_Reference:

   ground condition

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

   Geospatial_Data_Presentation_Form: tabular and vector 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. It contains the following vector data types (SDTS terminology):
      • Point (1,166,747)
   2. What coordinate system is used to represent geographic features?
      

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:

      UTM_Zone_Number: 17N
      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -81.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000
      

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.6096
      Ordinates (y-coordinates) are specified to the nearest 0.6096
      Planar coordinates are specified in meters
      The horizontal datum used is World Geodetic System of 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 1/298.257223563.
      

      Vertical_Coordinate_System_Definition:

      Altitude_System_Definition:

      Altitude_Datum_Name: North American Vertical Datum 1988
      Altitude_Resolution: 0.01
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method: Attribute values
      

7. How does the data set describe geographic features?

   Madeira_Beach_2017_SBES_WGS84_UTM17N_xyz.txt

   Comma-delimited ASCII text file (.txt) containing the processed single-beam bathymetry data points from USGS FAN 2017-305-FA (subFANs 17TST02, 17TST03, and 17TST04). Data are in the native acquisition and processing datum WGS84 (G1762) equivalent to ITRF08. Text file attributes include easting and northing (WGS84 G1762 UTM 17N), ellipsoid height (WGS84 G1762 UTM 17N), latitude (WGS84 G1762), longitude (WGS84 G1762), year, day of year (DOY), UTC time, GPS week, GPS second of the week, and trackline name. (Source: U.S. Geological Survey)

   WGS84_UTM17N_X

   x-axis coordinate, easting, WGS84 (G1762) UTM 17N (Source: U.S. Geological Survey)

   Range of values
   Minimum:	320011.275
   Maximum:	324921.079
   Units:	meters

   WGS84_UTM17N_Y

   y-axis coordinate, northing, WGS84 (G1762) UTM 17N (Source: U.S. Geological Survey)

   Range of values
   Minimum:	3072119.463
   Maximum:	3077259.719
   Units:	meters

   WGS84_ELLIPSOID_Z

   z-value, ellipsoid height (elevation) (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-38.648
   Maximum:	-26.133
   Units:	meters

   WGS84_UTM17N_LAT

   x-axis coordinate, latitude, WGS84 (G1762) UTM 17N (Source: U.S. Geological Survey)

   Range of values
   Minimum:	27.761902
   Maximum:	27.808064
   Units:	Decimal Degrees

   WGS84_UTM17N_LONG

   y-axis coordinate, longitude, WGS84 (G1762) UTM 17N (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-82.827003
   Maximum:	-82.777056
   Units:	Decimal Degrees

   YEAR

   Calendar year of data acquisition (Source: U.S. Geological Survey)

   Range of values
   Minimum:	2017
   Maximum:	2017

   DOY

   Day of year of data acquisition (Source: U.S. Geological Survey)

   Range of values
   Minimum:	45
   Maximum:	48

   UTC_TIME

   GPS second of data acquisition (Source: U.S. Geological Survey)

   Range of values
   Minimum:	14:35:45.806
   Maximum:	21:23:34.630
   Units:	HH:MM:SS.sss

   HYPACK_LINE

   Identifier assigned to each HYPACK line during acquisition (Source: HYPACK/U.S. Geological Survey) Example: TVEE_002_1741_1000, where the first 5 characters are the platform/vessel followed by an underscore (TVEE_, SHRK_ or CHUM_) and the next 8 characters are the start time in UTC (002_1741). If the line has segments, there will be 5 more characters corresponding to the segment number (_0001, _0002, et cetera).

   GPS_SECOND

   The GPS second of the GPS week that the data was collected (Source: GrafNav)

   Range of values
   Minimum:	229022
   Maximum:	498339
   Units:	seconds

   GPS_WEEK

   The GPS week that the data was collected (Source: GrafNav)

   Range of values
   Minimum:	1936
   Maximum:	1936

   Madeira_Beach_2017_SBES_NAD83_NAVD88_UTM17N_GEOID12B_xyz.txt

   Comma-delimited ASCII text file (.txt) containing of the processed single-beam bathymetry data points from FAN 2017-305-FA (subFANs 17TST02, 17TST03, and 17TST04). Data were re-projected from its native datum to NAD83 NAVD88 UTM Zone 17 North coordinate system with respect to the GEOID 12B datum. Text file attributes include easting (NAD83 UTM 17N), northing (NAD83 UTM 17N), orthometric height (NAVD88 GEOID 12B), latitude (NAD83 UTM 17N), longitude (NAD83 UTM 17N), year, day of year (DOY), UTC time, GPS week, GPS second of the week, and trackline name. (Source: VDatum)

   NAD83_UTM17N_X

   x-axis coordinate, easting, NAD83 UTM 17N (Source: VDatum)

   Range of values
   Minimum:	320011.869
   Maximum:	324921.671
   Units:	meters

   NAD83_UTM17N_Y

   y-axis coordinate, northing, NAD83 UTM 17N (Source: VDatum)

   Range of values
   Minimum:	3072118.834
   Maximum:	3077259.089
   Units:	meters

   NAVD88_G12B

   z-value, orthometric height (elevation) in NAVD88 GEOID 12B (Source: VDatum)

   Range of values
   Minimum:	-12.771
   Maximum:	-0.26
   Units:	meters

   NAD83_UTM17N_LAT

   x-axis coordinate, latitude, NAD83 UTM 17N (Source: VDatum)

   Range of values
   Minimum:	27.761896
   Maximum:	27.808059
   Units:	Decimal Degrees

   NAD83_UTM17N_LONG

   y-axis coordinate, longitude, NAD83 UTM 17N (Source: VDatum)

   Range of values
   Minimum:	-82.826997
   Maximum:	-82.77705
   Units:	Decimal Degrees

   YEAR

   Calendar year of data acquisition (Source: U.S. Geological Survey)

   Range of values
   Minimum:	2017
   Maximum:	2017

   DOY

   Day of year of data acquisition (Source: U.S. Geological Survey)

   Range of values
   Minimum:	45
   Maximum:	48

   UTC_TIME

   UTC time of data acquisition (Source: U.S. Geological Survey)

   Range of values
   Minimum:	14:35:45.806
   Maximum:	21:23:34.630
   Units:	HH:MM:SS.sss

   HYPACK_LINE

   Identifier assigned to each HYPACK line during acquisition (Source: HYPACK/U.S. Geological Survey) Example: TVEE_002_1741_1000, where the first 5 characters are the platform/vessel followed by an underscore (TVEE_, SHRK_ or CHUM_) and the next 8 characters are the start time in UTC (002_1741). If the line has segments, there will be 5 more characters corresponding to the segment number (_0001, _0002, et cetera).

   GPS_SECOND

   The GPS second of the GPS week that the data was collected (Source: GrafNav)

   Range of values
   Minimum:	229022
   Maximum:	498339
   Units:	seconds

   GPS_WEEK

   The GPS week that the data was collected (Source: GrafNav)

   Range of values
   Minimum:	1936
   Maximum:	1936

   Madeira_Beach_2017_SBES_tracklines.shp

   Polyline shapefile of the single-beam bathymetry tracklines containing FID, Shape, HYPACKLine name, and line length (in meters). (Source: Esri)

   FID

   Automatically generated feature attribute by Esri. (Source: Esri)

   Range of values
   Minimum:	0
   Maximum:	195

   Shape

   Automatically generated feature attribute by Esri. (Source: Esri) Polyline ZM

   HYPACKLine

   Identifier assigned to each HYPACK line during acquisition. (Source: HYPACK/U.S. Geological Survey) Example: TVEE_002_1741_1000, where the first 5 characters are the platform/vessel followed by an underscore (TVEE_, SHRK_ or CHUM_) and the next 8 characters are the start time in UTC (002_1741). If the line has segments, there will be 5 more characters corresponding to the segment number (_0001, _0002, et cetera).

   Length_M

   Length of the trackline polyline, in meters. (Source: Esri)

   Range of values
   Minimum:	22.51
   Maximum:	5286.13

   MadeiraBeach_2017_SBES_20m_DEM.tif

   This is a 20-m cell size gridded DEM GeoTIFF (.tif) created from the x,y,z point dataset in this data release (Madeira_Beach_2017_SBES_WGS84_UTM17N_xyz.txt). The ellipsoid elevation ranges from -26.47 m to -37.57 m and is projected in WGS84 UTM 17N. The file format is 32-bit floating point GeoTIFF with 246 columns, 258 rows. (Source: Esri)

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, St. Petersburg Coastal and Marine Science Center
3. To whom should users address questions about the data?
   Nancy T. DeWitt

   U.S. Geological Survey

   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: 2017 (process 1 of 7)

   Global Navigation Satellite System (GNSS) Acquisition: GNSS data was recorded at a primary base station and aboard each roving vessel. The primary base station was FDOT FPRN base station FLIS located approximately 15 kilometers (km) north of the survey area. The base station was operational for the entire survey and the Receiver Independent Exchange Format (RINEX) datafiles (FLIS045M00.17O, FLIS045M00.17N, and FLIS045M00.17G) were downloaded from the FPRN website post survey. FLIS was the name at the time of the single-beam survey in 2017. But at the time of this publication, the location has been renamed FLIB in the FDOT system. The roving vessels were each outfitted with a Spectra Geospatial SP90M GNSS receivers and GNSS antennae recording data at 10 hertz (10 epochs/second). The GNSS files were converted from proprietary G-file format into the non-proprietary RINEX raw data file format using RINEX Converter version 3.00. The base and rover RINEX files were post processed together in a subsequent step to obtain differentially corrected navigation data, which is described later in the metadata. Example RINEX filename TVEE0450.17O where the convention TVEE is the four-letter rover name, 045 is the day of year, 0 is the session number, 17 is the year and O is the observation file (or N for navigation file, M for meteorlogical file, G for Global Navigation Satellite Navigation System (GLONASS) navigation message file. Person who carried out this activity:
   

   Nancy T. DeWitt

   U.S. Geological Survey

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   727-502-8000 (voice)

   ndewitt@usgs.gov

   Data sources produced in this process:

   • *.17O, *.17N, *.17M

   Date: 2017 (process 2 of 7)

   Single-Beam Bathymetry Acquisition: TVEE collected 87.12 line-km (62 lines), SHRK collected 145.46 line-km (60 lines) and the CHUM collected 61.83 line-km (80 lines). Boat motion was recorded at 50-millisecond (ms) using a SBG Ellipse A motion sensor. HYPACK A Xylem Brand (version 16.1.9.0), a marine surveying, positioning, and navigation software package, managed the planned-transect information and provided real-time navigation, steering, correction, data quality, and instrumentation status to the boat operator. Depth soundings were recorded at 50-ms intervals using an Odom echotrac CV100 echosounder with a 4-degree, 200-kilohertz (kHz) transducer. Data from the GNSS receiver, motion sensor, and echosounder were recorded in real-time aboard all vessels independently and merged into a single raw data file (.RAW) in HYPACK, with each device string referenced by a device identification code and time stamped to Coordinated Universal Time (UTC). Sound velocity profile (SVP) measurements were collected using SonTek Castaway Conductivity, Temperature, and Depth (CTD) instruments. The instruments were periodically cast overboard to record changes in water column speed of sound (SOS). A total of 17 successful sound velocity casts were collected and ranged in depth from 0.15 to 6.48 m (average 2.14 m), and in sound velocity from 1518.18 to 1525.69 meters per second (m/s) (average 1520.94 m/s). Person who carried out this activity:
   

   Nancy T. DeWitt

   U.S. Geological Survey

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   727-502-8000 (voice)

   ndewitt@usgs.gov

   Date: 2017 (process 3 of 7)

   Differentially Corrected Navigation Processing: The FDOT FPRN datasheet for FLIS were retrieved from the database and the base station coordinates were converted from NAD83 (2011) EPOCH 2010.0 into WGS84 (G1762) equivalent to ITRF2008 using the HTDP online transformation utility version 3.2.5 (https://www.ngs.noaa.gov/TOOLS/Htdp/Htdp.shtml). The WGS84 (G1762) epoch realization was introduced in 2013. The survey acquisition dates succeed this date; therefore, it was the appropriate datum realization for post-processing the navigation data which was acquired in the WGS84 (G1762) datum. The resultant base position used for post-processing was 27°5247.88931 North (WGS84-G1762), 82°5033.69685 West (WGS84-G1762), and -17.543 m ellipsoid height (WGS84-G1762). The kinematic trajectories (rover to base) were processed using NovAtel's Waypoint GrafNav software version 8.60.5025. The rover RINEX files and the base RINEX files were imported into Grafnav, converted into proprietary files, and the kinematic (rover) GNSS data session from the survey vessel was post-processed to the concurrent base GNSS data session. Analyzing the data plots, trajectory maps, processing logs, satellite health plots, and other viewing utilities that GrafNav produces, provided measures to attain trajectory solutions (between the rover and the base) free of erroneous data that resulted in fixed positions. Some analytic examples include 1) excluding satellites flagged by the program as having bad/poor health or cycle slips, 2) Excluding poor satellite time segments that have a negative influence toward a fixed solution, and 3) adjusting the satellite elevation mask angle to improve the position solutions. This process was repeated for every GNSS data session(Hansen and others, 2017). The final differentially corrected, precise DGPS positions were computed at and exported in American Standard Code for Information Interchange (ASCII) text format in WGS84 (G1762) UTM 17N geodetic datum. Filename example 17TST02_045_2017_FLIS_TVEE_A.txt where the convention 17TST02 is the subFAN, 045 is day of year, 2017 is the year, FLIS is the base station used, TVEE is the rover, and A is the GPS session from A to Z. Person who carried out this activity:
   

   Nancy T. DeWitt

   U.S. Geological Survey

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   727-502-8000 (voice)

   ndewitt@usgs.gov

   Data sources used in this process:

   • *.17O, *.17N, *.17G, *.17M

   Data sources produced in this process:

   • 17TST02_045_2017_FLIS_TVEE_A.txt

   Date: 2017 (process 4 of 7)

   Bathymetry Processing: All data were processed using CARIS HIPS and SIPS (Hydrographic Information Processing System and Sonar Information Processing System) version 10.2. First, a vessel file *.vhf, unique to the platform, was created that contains the surveyed offsets measurements between the sensors. A CARIS project was created using the *.vhf file, and then the HYPACK *.RAW and the SVP profiles *.SVP were loaded. Next, the differentially corrected navigation files were imported using the generic data parser tool. Then, the differently corrected navigation files overwrote every non-differential position in the HYPACK *.RAW file based upon time. The bathymetric data components (position, motion, depth, and SOS) were then georeferenced and geometrically corrected in CARIS to produce processed x,y,z positional data. Once georeferenced, the data were reviewed and edited for outliers, including further review in the Subset Editor utility for crossing status, and questionable areas or data points were removed. The geometrically corrected point data were then exported as an x,y,z ASCII text file referenced to WGS84 (G1762) UTM 17N (Hansen and others, 2017). Person who carried out this activity:
   

   Nancy T. DeWitt

   U.S. Geological Survey

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   727-502-8000 (voice)

   ndewitt@usgs.gov

   Data sources used in this process:

   • *.VHF
   • *.RAW
   • *.SVP
   • 17TST02_045_2017_FLIS_TVEE_A.txt

   Data sources produced in this process:

   • 17TST02_SBB_ITRF08_Level_003_xxx.txt
   • 17TST03_SBB_ITRF08_Level_003_xxx.txt
   • 17TST04_SBB_ITRF08_Level_003_xxx.txt

   Date: 2017 (process 5 of 7)

   Quality Control, Quality Assurance (QA/QC) and Uncertainty Analysis: The single-beam data exported from CARIS HIPS and SIPS (x,y,z ASCII text files) were transformed in Esri ArcMap version 10.4.1 to a point shapefile (.shp) utilizing the "Create Feature Class From XY Table" geoprocessing tool. The projection was set to WGS84 UTM 17N. The generated shapefile was visually scanned for any obvious outliers or problems. Next, a polyline shapefile (representing tracklines) was produced from the point shapefile using XTools Pro (version 16.1) "Make Polylines from Points" geoprocessing tool for each survey platform (subFANs 17TST02, 17TST03 and 17TST04). Utilizing both the x,y,z (point) and trackline (polyline) shapefiles, a Python script was used to evaluate elevation differences at the intersection of crossing tracklines by calculating the elevation difference between points at each intersection using an inverse distance weighting equation with a search radius of 5 m (Hansen and others, 2017). The maximum crossing error for TVEE (17TST02), when crossing a trackline it previously surveyed, was 18 cm. The maximum crossing error for SHRK (17TST03), when crossing a trackline it previously surveyed, was 22 cm. The maximum crossing error for CHUM (17TST04), when crossing a trackline it previously surveyed, was 43 cm. Any crossings greater than 30 cm were reviewed a final time for errors and either removed or adjusted, based on the situation when compared with the other vessels. The shapefiles were merged into one large file and sent through the python crossing program a last time. The final crossing file had 1847 crossings ranging from 0.00 to 34 cm in which 80.7% were 10 cm or less; 13.5% were between 10-15 cm; 6.1% were between 15-30 cm, and 0.22% were greater than 30cm. These files were then exported from Esri ArcMap as x,y,z ASCII text (.txt) files using the XTools Pro "Table to Text" function. The resultant ASCII text file can be downloaded from this data release in Madeira_Beach_2017_SBES_xyz.zip, and the trackline shapefile Madeira_Beach_2017_SBES_tracklines.zip. Person who carried out this activity:
   

   Nancy T. DeWitt

   U.S. Geological Survey

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   727-502-8000 (voice)

   ndewitt@usgs.gov

   Data sources used in this process:

   • 17TST02_SBB_ITRF08_Level_003_xxx.txt
   • 17TST03_SBB_ITRF08_Level_003_xxx.txt
   • 17TST04_SBB_ITRF08_Level_003_xxx.txt

   Data sources produced in this process:

   • Madeira_Beach_2017_SBES_WGS84_UTM17N_xyz.txt
   • Madeira_Beach_2017_SBES_tracklines.shp

   Date: 2023 (process 6 of 7)

   Datum Transformation: NOAA/NGS's VDatum v.3.6 was used to transform the single-beam data points' horizontal and vertical datums (x,y,z). The transformation was from WGS84 (G1762) into NAD83 (horizontal) UTM 17N and NAVD88 (vertical) using GEOID12B. VDatum reports a nationwide standard deviation of 2.0 centimeters (cm) for ellipsoid - NAD83 transformations, and a nationwide standard deviation of 5.0 cm for NAD83 to NAVD88 transformations in the coastal regions of the continental U.S. For more information about the positional accuracy for these datum transformations, visit the Estimation of Vertical Uncertainties VDatum webpage, https://vdatum.noaa.gov/docs/est_uncertainties.html. The resultant data points ASCII data file can be downloaded from this data release in Madeira_Beach_2017_SBES_xyz.zip. Person who carried out this activity:
   

   Nancy T. DeWitt

   U.S. Geological Survey

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   727-502-8000 (voice)

   ndewitt@usgs.gov

   Data sources used in this process:

   • Madeira_Beach_2017_SBES_WGS84_UTM17N_xyz.txt

   Data sources produced in this process:

   • Madeira_Beach_2017_SBES_NAD83_NAVD88_UTM17N_GEOID12B_xyz.txt

   Date: 2023 (process 7 of 7)

   DEM Creation: Using Esri ArcGIS version 10.4.1, a polygon shapefile of the single-beam data extent was created (MadeiraBeach_2017_SBB_polygon.shp). Next using ArcGIS "polygon to raster" conversion tool a raster mask of the shapefile was created (mb2017ply20m). Next using the single-beam x,y,z data a 20 x 20-m cell resolution DEM was generated using the natural neighbor algorithm. The algorithm computation results produce minimum and maximum values (-26.469 to -37.569) different then the ascii text xyz values (-23.133 to -38.648) from which it was created. The DEM was then clipped to the raster mask using ArcGIS Spatial Analyst "extract by raster mask" tool and then exported as a GeoTIFF file for this data release. Person who carried out this activity:
   

   Nancy T. DeWitt

   U.S. Geological Survey

   Geologist

   600 4th Street South

   St. Petersburg, FL
   

   USA

   727-502-8000 (voice)

   ndewitt@usgs.gov

   Data sources used in this process:

   • Madeira_Beach_2017_SBES_WGS84_UTM17N_xyz.txt

   Data sources produced in this process:

   • MadeiraBeach_2017_SBES_20m_DEM.tif

3. What similar or related data should the user be aware of?
   Hansen, Mark E., Dewitt, Nancy T., and Reynolds, Billy J., 20170810, Archive of bathymetry data collected in South Florida from 1995 to 2015: U.S. Geological Survey Data Series 1031, U.S. Geological Survey, Reston, VA.

   Online Links:

   • https://doi.org/10.3133/ds1031

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

1. How well have the observations been checked?
   The accuracy of the data was determined during data collection. This dataset is derived from a single field survey using identical equipment set-ups, and staff; therefore, the dataset is internally consistent. Methods were employed to maintain data collection consistency aboard the platforms. During mobilization, each piece of equipment was isolated to obtain internal- and external-offset measurements with respect to the survey platform. All the critical measurements were recorded manually, and then digitally entered into their respective programs. Offsets between the single-beam transducers, motion reference units, and the antenna reference point (ARP) were measured using a geodimeter and accounted for during acquisition and (or) in post-processing. Differential Global Positioning System (DGPS) coordinates were obtained using the following post-processing software packages: NovAtel's Waypoint Product Group GrafNav, version 8.60.5025).
2. How accurate are the geographic locations?
   The Florida Department of Transportation's (FDOT) Florida Permanent Reference Network (FPRN) datasheet for the FPRN location named FLIS was retrieved from their database. FLIS was the location name at the time of the single-beam survey in 2017. But at the time of this publication, the location has been renamed FLIB in the FDOT system. The base station coordinates were converted from NAD83 (2011) EPOCH 2010.0 into WGS84 (G1762) equivalent to ITRF2008 using the HTDP online transformation utility version 3.2.5 (https://www.ngs.noaa.gov/TOOLS/Htdp/Htdp.shtml). The WGS84 (G1762) epoch realization was introduced in 2013. The survey acquisition dates succeed this date; therefore, it was the appropriate datum realization for post-processing the navigation data which was acquired in the WGS84 (G1762) datum. The resultant base position used for post-processing was 27°5247.88931 North, 82°5033.69685 West (WGS84-G1762), and -17.543 m ellipsoid height (WGS84-G1762). The kinematic trajectories (rover to base) were processed using NovAtel's Waypoint GrafNav software version 8.60.5025.
3. How accurate are the heights or depths?
   The ellipsoid height value -17.543 m (WGS84-G1762) was used in NovAtel's Waypoint GrafNav software. Please refer to the Horizontal_Positional_Accuracy_Report segment for vertical position transformation into ellipsoid height.
4. Where are the gaps in the data? What is missing?
   This data release contains single-beam bathymetry data points in the horizontal position and vertical elevation (x,y,z) from February 2017 collected off Madeira Beach, Florida. Users are advised to read the complete metadata record carefully for additional details.
5. How consistent are the relationships among the observations, including topology?
   These data were collected during a single field activity with consistent instrument calibrations.

How can someone get a copy of the data set?

1. Who distributes the data set? (Distributor 1 of 1)
   
   U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center

   Attn: USGS SPCMSC Data Management

   600 4th Street South

   Saint Petersburg, FL
   

   United States

   727-502-8000 (voice)

   gs-g-spcmsc_data_inquiries@usgs.gov
2. What's the catalog number I need to order this data set? Madeira_Beach_2017_SBES_WGS84_UTM17N_xyz.txt, Madeira_Beach_2017_SBES_WGS84_tracklines.shp, Madeira_Beach_2017_SBES_NAD83_NAVD88_UTM17N_GEOID12B_xyz.txt, Madeira_Beach_2017_SBES_20m_DEM.tif
3. What legal disclaimers am I supposed to read?
   This digital 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:

     comma-delimited text, shapefile Size: 57.4

     Network links:

     https://coastal.er.usgs.gov/data-release/doi-P9Y7R8NS/data/Madeira_Beach_2017_SBES_xyz.zip https://coastal.er.usgs.gov/data-release/doi-P9Y7R8NS/data/Madeira_Beach_2017_SBES_NAD83_NAVD88_UTM17N_GEOID12B_xyz.zip https://coastal.er.usgs.gov/data-release/doi-P9Y7R8NS/data/Madeira_Beach_2017_SBES_tracklines.zip https://coastal.er.usgs.gov/data-release/doi-P9Y7R8NS/data/Madeira_Beach_2017_SBES_20m_DEM.zip

   • Cost to order the data: None

Who wrote the metadata?

Dates:

Last modified: 01-May-2024

Metadata author:

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

Attn: USGS SPCMSC Data Management

600 4th Street South

Saint Petersburg, FL

United States

727-502-8000 (voice)

gs-g-spcmsc_data_inquiries@usgs.gov

Metadata standard:

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