Jake J. Fredericks
Andrew S. Farmer
Kimberly K. Yates
David G. Zawada
20190607
Multibeam Bathymetry Data Collected in March 2018 at Crocker Reef, the Florida Keys
U.S. Geological Survey Data Release
doi:10.5066/P93PPPHU
St. Petersburg, FL
U.S. Geological Survey
https://doi.org/10.5066/P93PPPHU
An Ellipsoidally Referenced Survey (ERS) using two Teledyne Reson SeaBat T50-P multibeam echosounders, in dual-head configuration, was conducted by the U.S Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center (SPCMSC) at Crocker Reef, the Florida Keys March 8-15, 2018. This dataset, Crocker_2018_MBB_xyz.zip, includes the processed elevation point data (x,y,z), as derived from a 1-meter (m) bathymetric grid.
The purpose of the survey was to collect high density multibeam bathymetry data of Crocker Reef in an effort to asses sediment accumulation within the survey area. Data were collected during USGS field activity number (FAN) 2018-313-FA. Additional survey and data details are available from the USGS Coastal and Marine Geoscience Data System (CMGDS) at, https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-313-FA.
The processed sonar data are provided as an American Standard Code for Information Interchange (ASCII) x,y,z point data file. These values are not the individual soundings, but nodes from a 1-m bathymetric grid. The Z value for the node is generated by utilizing a Combined Uncertainty and Bathymetry Estimator (CUBE) surface and has an estimated total value of uncertainty (Calder and Wells, 2007). The bathymetry data were collected and processed in the World Geodetic System of 1984 (WGS84) vertical and horizontal datums. If the data are needed in any additional datums, it is recommended that the transformation be performed using the National Oceanic and Atmospheric Administration (NOAA) VDatum version 3.9 transformation software (http://vdatum.noaa.gov/). Data were collected under Florida Keys National Marine Sanctuary permit FKNMS-2016-068.
20180308
20180315
ground condition
None planned
-80.55353932
-80.51199874
24.92086199
24.89136372
ISO 19115 Topic Category
oceans
elevation
location
geoscientificInformation
imageryBaseMapsEarthCover
USGS Thesaurus
marine geology
geophysics
bathymetry
multibeam sonar
ocean characteristics
ocean processes
None
hydrography
seafloor mapping
Teledyne Reson T50-P
Applanix POS MV Wavemaster II
U.S. Geological Survey
USGS
St. Petersburg Coastal and Marine Science Center
SPCMSC
Geographic Names Information System (GNIS)
Florida
Florida Keys
Crocker Reef
None
March 2018
None
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research.
Jake J. Fredericks
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727)502-8000
jfredericks@usgs.gov
U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center
Microsoft Windows 7 Version 6.2 (Build 9200) Service Pack 1
Calder, B.R. and Wells, D.E.
20070129
CUBE User's Manual
Durham, NH
University of New Hampshire, Center for Coastal and Ocean Mapping
pages 3-12
https://scholars.unh.edu/ccom/1217
International Hydrographic Organization
2008
IHO Standards for Hydrographic Surveys
4, quai Antoine 1er B.P. 445 - MC 98011 MONACO Cedex Principauté de Monaco
International Hydrographic Bureau
pages 15-16
https://www.iho.int/iho_pubs/standard/S-44_5E.pdf
This dataset was from one research cruise and was therefore internally consistent. Methods were employed to maintain data collection consistency aboard the platform. 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 digitally entered into their respective programs.
This file represents the post-processed bathymetric data (x,y,z) collected during a multibeam bathymetry survey.
These are complete post-processed x,y,z bathymetric data points from multibeam data collected at Crocker Reef, the Florida Keys, March 2018.
All data were collected and processed to meet or exceed International Hydrographic Organization (IHO) Special Order standards for positioning and depth (IHO, 2008). Individual Total Propagated Uncertainty (TPU) values associated with each node are available in the XYZ file.
All data were collected and processed to meet or exceed IHO Special Order standards for positioning and depth (IHO, 2008). Individual TPU values associated with each node are available in the XYZ file.
Acquisition:
An ERS was conducted using two Teledyne Reson SeaBat T50-P multibeam echosounders, in dual-head configuration. The pair of Mills Cross [configuration] transmit and receive arrays, were placed side-by-side within a bracket that oriented them at opposing 30-degree angles (relative to horizontal). The bracket was pole-mounted on the starboard gunnel of the R/V Sallenger, a 26-ft fiberglass research vessel. The sonar arrays were oriented athwartships (primary and secondary arrays facing outward and down to port and starboard, respectively) and located approximately 1-m below the waterline when deployed. An Applanix Pos MV Wavemaster II V5 inertially aided navigation system was used for timing, positioning, and attitude. The Inertial Measurement Unit (IMU) was mounted atop the sonar bracket just aft of the pole. Two Trimble 540AP Global Navigation Satellite System antennas were affixed atop the cabin approximately amidships of the vessel, two meters apart, port-starboard. An AML Oceanographic Micro-X sound velocity sensor was used for speed of sound readings at the sonar head. A Valeport SWiFT sound velocity profiler was used for measuring sound velocity profiles. Hydrographic survey acquisition and processing software, HYPACK/HYSWEEP (version 2016a) managed data inputs from sensors and produced two files (.RAW and .HSX). Data were collected in WGS84 [G1762] Universal Transverse Mercator (UTM) Zone 17 North (17N) coordinates.
2018
Jake J. Fredericks
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727)502-8000
jfredericks@usgs.gov
Processing:
Positioning and attitude data were post-processed in Applanix POSPac MMS (POSPac) software version 8.0 Service Pack 3. Raw position files were imported into POSPac and processed with the IN-Fusion GNSS Nav - Single Base processing mode utilizing Florida Department of Transportation, Permanent Reference Network base station Plantation Key (FLPK); creating smoothed best estimate of trajectory (SBET) files and dynamic error files (SMRMSG) for each day of the survey.
Bathymetric data were post-processed in CARIS Hydrographic processing software HIPS/SIPS version 10.4. HYPACK acquisition files (.HSX) were first imported into CARIS and then post-processed navigation files (SBET and SMRMSG) were imported and applied. Additionally, GPS tide (GPS tidal corrections utilize GPS height information from real time survey observations to obtain an ellipsoid height) was computed and sound velocity profiles were applied. Roll calibration was also performed, as necessary. TPU was calculated from real time values recorded in the HSX and the SMRMSG files. Data were filtered to exclude any points with RESON Quality flags of 0, 1, and 2 (these flags are assigned to individual soundings at the time of acquisition and are a metric of pass/fail in regards to both brightness and collinearity: 0 = fail both, 1 = pass brightness only, 2 = pass collinearity only), as well as soundings that had a TPU greater than stated IHO Special Order standards (IHO, 2008). Refraction artifacts were addressed using Refraction Editor. Further editing was performed in Subset Editor. A visual and statistical inspection of the data was performed to serve as quality control. A 1-m bathymetric CUBE surface was computed and the final surface was exported as an x,y,z ASCII file using the Base Surface to ASCII function.
2018
2018_313_Crocker_MBES_1m_WGS84_UTM17N.xyz
Jake J. Fredericks
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727)502-8000
jfredericks@usgs.gov
Point
Point
6076608
Universal Transverse Mercator
17
0.999600
-81.0
0.0
500000.0
0.0
coordinate pair
0.6096
0.6096
meters
World Geodetic System of 1984
WGS_84
6378137.0
298.257223563
World Geodetic System of 1984
0.001
meters
Attribute values
2018_313_Crocker_MBES_1m_WGS84_UTM17N.xyz
ASCII comma-delimited text (.txt) file containing the processed 1-m bathymetric grid x,y,z data in the WGS84 [G1762] realization (ellipsoid height).
HYPACK
WGS84_UTM17N_X
WGS84 UTM Zone 17N X-coordinate (easting) of sample point, in meters.
HYPACK
545092.000
549276.000
0.001
WGS84_UTM17N_Y
WGS84 UTM Zone 17N Y-coordinate (northing) of sample point, in meters.
HYPACK
2753007.000
2756259.000
0.001
WGS84_Ellipsoid_Z
WGS84 (ellipsoid height) of sample point, in meters.
HYPACK
-70.788
-28.312
0.001
TPU
TPU = Total Propagated Uncertainty
CARIS
0.034
0.667
0.001
Jake J. Fredericks
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
jfredericks@usgs.gov
2018_313_Crocker_MBES_1m_WGS84_UTM17N.xyz
Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
ASCII
ZIP
41.5
https://coastal.er.usgs.gov/data-release/doi-P93PPPHU/data/Crocker_2018_MBB_xyz.zip
None
20190606
Jake J. Fredericks
U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
Geologist
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
jfredericks@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
none
unclassified
None