Mark Hansen
2015
Single-Beam Bathymetry Sounding Data of Lemon Bay, Florida (2011) in XYZ format
tabular digital data
Archive of Bathymetry Data Collected in South Florida from 1995 to 2015
U.S. Geological Survey Data Series-1031
St. Petersburg, Florida
U.S. Geological Survey
https://doi.org/10.3133/ds1031
Lemon Bay is a long narrow body of water on the west central Florida coast, straddling both Sarasota and Charlotte counties. It encompasses nearly 7700 acres and ranges in depth from 7 meters (m) at Stump Pass to less than 10 centimeters (cm) on the many emergent shoals throughout the bay. The bay is home to a sizeable manatee population where they feed in the very shallow waters on sea grass. Manatees have been satellite tracked and found their daily routine includes moving to and from grass flats including crossing the Intercoastal Water Way (ICWW). Unfortunately, due to the configuration of the main ICWW, there is a high incident of manatee deaths due to boat collisions. In an effort reduce fatalities, the Florida Fish and Wildlife Conservation Commission (FWC) and the Wildlife Foundation of Florida (WFF) has developed a program entitled Manatee Response to Boats.
This report serves as an archive of processed single-beam bathymetry data that were collected in Lemon Bay, Florida in 2011. Geographic information system data products include a XYZ data, bathymetric contours, and USGS quadrangle map. Additional files include formal Federal Geographic Data Committee (FGDC) metadata.
The overarching goal of the study is to understand how manatees respond to water-craft in their natural environment in order to provide managers with a solid scientific basis for taking actions to reduce the risk of vessel strikes. The specific goal of this FWC funded project is to create a detailed bathymetric map of the 2007 study area in Lemon Bay using a vessel-mounted acoustic swath system. Data on bathymetry provide the essential physiographic context for understanding manatee-boat interactions and constraints on manatee movements and habitat use.
2011
Data assumed to be constant over time but may change due to geologic processes.
None planned
-82.43515
-82.26967
27.04745
26.82385
USGS Metadata Identifier
USGS:ff5d8eaf-9868-4329-801c-523d297c4d30
General
bathymetry
circulation model
hydrology
mapping
SANDS
sediment dynamics
System for Accurate Nearshore Depth Surveying
single beam
echosounder
erosion
hydrography
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
St. Petersburg Coastal and Marine Science Center
SPCMSC
soundings
elevation
sea floor
orthometric
water depth
ISO 19115 Topic Category
environment
inlandWaters
elevation
geoscientificInformation
imageryBaseMapsEarthCover
oceans
Department of Commerce, 2001, Countries, Dependencies, Areas of
Special Sovereignty, and Their Principal Administrative Divisions,
Federal Information Processing Standard (FIPS) 10-4, Washington,
D.C., National Institute of Standards and Technology
United States
US
U.S. Department of Commerce, 1987, Codes for the identification of
the States, the District of Columbia and the outlying areas of the
United States, and associated areas (Federal Information Processing
Standard 5-2): Washington, D. C., NIST
Florida
FL
Department of Commerce, 1990, Counties and Equivalent Entities of
the United States, Its Possessions, and Associated Areas, FIPS 6-3,
Washington, DC, National Institute of Standards and Technology
Lemon Bay
Manasota Key
Englewood
Gulf of Mexico
The U.S. Geological Survey requests that it be referenced as the originator of this dataset in any future products or research derived from these data.
These data should not be used for navigational purposes.
Mark Hansen
U.S. Geological Survey
Oceanographer
mailing and physical address
600 Fourth Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
mhansen@usgs.gov
Florida Fish and Wildlife Conservation Commission (FWC) and The Wildlife Foundation of Florida (WFF) provided funding for the study. B.J Reynolds was the USGS principal investigator and Mark Hansen was the USGS co-investigator. Nancy DeWitt performed a significant portion of bathymetric survey data collection and processing.
Microsoft Windows 7 Enterprise, Service Pack 1; ESRI ArcGIS 10.2.1 Build 3497
The accuracy of the data is determined during data collection. This dataset is derived from multiple research cruises using identical equipment, set-ups, and staff; therefore, it is internally consistent. Methods are employed to maintain data collection consistency aboard the platform. During mobilization, each piece of equipment is isolated to obtain internal and external offset measurements with respect to the survey platform. All the critical measurements are recorded manually and digitally entered into their respective programs. Offsets between the single-beam transducers and the Ashtech antenna reference point (ARP) were measured and accounted for in post-processing. Bar checks were performed as calibration efforts and accounted for any drift in the Marimatech Echosounder. Differential Geographic Positioning System (DGPS) coordinates were obtained using post-processing software packages developed by the National Oceanic and Atmospheric Administration (NOAA)/National Geodetic Survey (NGS) Online Positioning User Service (OPUS). Boat trajectories were computed with Grafnav v8.1 software by Novatel, Inc. These bathymetric data have not been independently verified for accuracy.
This dataset was acquired on multiple research cruises in 2011 with identical hardware and software systems.
These are complete post-processed x,y,z bathymetric data points with an acoustic single-beam system collected in 2011 on Lemon Bay, Florida area.
The GPS antenna and receiver acquisition configuration used at the reference station was duplicated on the survey vessel (rover). The base receiver and the rover receiver record their positions concurrently at 1Hz recording intervals throughout the survey. All processed measurements are referenced to the base station coordinates.
GPS base or differential reference stations were operated within approximately 15 to 20 km of the survey area. Two new temporary ground-control points or benchmarks (surveyed to within 1 cm to 2 cm accuracy) were established throughout the study area for use as reference receiver sites using standard benchmarks procedures. The new benchmarks were surveyed using Ashtech Z-Extreme, 12 channel dual-frequency GPS receivers. Full-phase carrier data were recorded on each occupied benchmark in Ashtech proprietary BIN format with daily occupations ranging from 6 to 12 hours. BIN files were then converted to RINEX-2 format for position processing.
All static base station GPS sessions were submitted for processing to the online OPUS system software. The computed base location results were entered into a spreadsheet to compute one final positional coordinate and error analysis for that base location. The final positional coordinate (latitude, longitude, and ellipsoid height) is the weighted average of all GPS sessions. For each GPS session, the weighted average was calculated from the total session time in seconds; therefore, longer GPS occupation times held more value than shorter occupation times. Results were computed relative to ITRF00 coordinate system. The established geodetic reference frame for the project was WGS84. Therefore, final reference coordinates used to process the rover data were transformed from ITRF00 to WGS84 using National Oceanic and Atmospheric Administration/National Geodetic Survey(NOAA/NGS) HTDP software v2.1.
OPUS results provide an error measurement for each daily solution. Applying these error measurements, the horizontal accuracy of the base station is estimated to be 0.04 (m) root mean squared (RMS).
The kinematic (rover) trajectories were processed using Grafnav v8.1 software by Novatel, Inc. A horizontal error measurement, RMS is computed for each epoch. The horizontal trajectory errors for varied between 0 and 0.08(m).
The combined horizontal error from base station coordinate solutions and rover trajectories range from 0 and 0.12 (m), with the average approximately 0.06 (m).
0.04
Static GPS data was processed using OPUS software and kinematic GPS data was processed with Grafnav v8.1 software by Novatel, Inc and SANDS v1.5
The GPS antenna and receiver acquisition configuration used at the reference station was duplicated on the survey vessel (rover). The base receiver and the rover receiver record their positions concurrently at 1Hz recording intervals throughout the survey. All processed measurements are referenced to the base station coordinates.
GPS base or differential reference stations were operated within approximately 15 to 20 km of the survey area. Two new temporary ground-control points or benchmarks (surveyed to within 1 cm to 2 cm accuracy) were established throughout the study area for use as reference receiver sites using standard benchmarks procedures. The new benchmarks were surveyed using Ashtech Z-Extreme, 12 channel dual-frequency GPS receivers. Full-phase carrier data were recorded on each occupied benchmark in Ashtech proprietary BIN format with daily occupations ranging from 6 to 12 hours. BIN files were then converted to RINEX-2 format for position processing.
All static base station GPS sessions were submitted for processing to the online OPUS system software. The computed base location results were entered into a spreadsheet to compute one final positional coordinate and error analysis for that base location. The final positional coordinate (latitude, longitude, and ellipsoid height) is the weighted average of all GPS sessions. For each GPS session, the weighted average was calculated from the total session time in seconds; therefore, longer GPS occupation times held more value than shorter occupation times. Results were computed relative to ITRF00 coordinate system. The established geodetic reference frame for the project was WGS84. Therefore, final reference coordinates used to process the rover data were transformed from ITRF00 to WGS84 using National Oceanic and Atmospheric Administration/National Geodetic Survey(NOAA/NGS) HTDP software v2.1.
OPUS results provide an error measurement for each daily solution. Applying these error measurements, the vertical accuracy of the base station is estimated to be 0.04 (m) root mean squared (RMS).
The kinematic (rover) trajectories were processed using Grafnav v8.1 software by Novatel, Inc. A vertical error measurement, RMS is computed for each epoch. The vertical trajectory errors for varied between 0 and 0.08(m).
The combined vertical error from base station coordinate solutions and rover trajectories range from 0 and 0.14 (m), with the average approximately 0.08 (m).
0.08
Static GPS data was processed using OPUS software and kinematic GPS data was processed with Grafnav v8.1 software by Novatel, Inc. and SANDS v1.2
U.S. Geological Survey
Unpublished material
2011 Lemon Bay, Florida single-beam bathymetry
digital tabular data
2011
ground condition
USGS Lemon Bay bathymetry
Original processed single-beam bathymetric data.
Data Acquisition - The sea-floor of Lemon Bay was mapped by using a jet ski, equipped with a high-precision Global Positioning Systems (GPS) coupled with a high-precision depth sounder. To accomplish this task, the SANDS (System for Accurate Nearshore Depth Surveying) system was developed by Mark Hansen (SPCMSC) and Jeff List (WHSC) of the U.S. Geological Survey. SANDS consists of two components, hardware and processing software.
Survey track lines were spaced 100-meters apart and orientated in a north/south orientation. Channels and inlets were surveyed in greater detail. Track lines collected parallel to the bay shoreline (intersecting track lines) functioned to serve as a cross-check and to assess the relative vertical accuracy of the survey. Crossing lines are critical because they serve as a check on the internal accuracy of the data. Soundings were collected along each track line at 3 m spacing. In shallow areas, data were collected in a minimum of 0.3 m water depth except where there was potential damage to the bottom environment or the boat/motors.
Reference GPS reference stations were operated on an USGS benchmark benchmark, typically located within approximately 15 km of the farthest single-beam track line. Reference and rover GPS receivers recorded the 12-channel full-carrier-phase positioning signals (L1/L2) from satellites via ASHTECH choke-ring antennas. The reference and rover receivers record their positions concurrently at 1-second(s) recording intervals throughout the survey.
Boat motion was recorded at 50-millisecond (ms) intervals using a TSS Dynamic Motion Sensor 05 (TSS DMS-05). Bathymetric soundings were recorded at 10-ms intervals using a Marimatech EC-100 survey grade echo-sounder. The single-beam data were acquired using the hydrographic software HYPACK version 5. All data strings from the instruments were streamed in real time and recorded through HYPACK software.
2011
Raw sensor data files in ASCII text format and GPS Carrier-phase data in binary format.
U.S. Geological Survey
Mark Hansen
Oceanographer
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
mhansen@usgs.gov
Differentially Corrected Navigation Processing- The coordinate values of the reference GPS base stations obtained from OPUS were provided in the ITRF00 coordinate system. All survey data for the project was referenced to WGS84. Consequently, reference station coordinates were transformed to WGS84 coordinates using the NOAA/NGS software HTDP v1.3. The respective reference (base) station coordinates utilized as reference positions were imported into PNAV v2.0 software by ASHTECH, Inc. Differentially corrected rover trajectories were computed by merging the master and rover the GPS data. During processing, steps were taken to ensure that the trajectories between the base and rover were clean, resulting in fixed positions. By analyzing the graphs, trajectory maps, and processing logs that GrafNav produces for each GPS session, GPS data from satellites flagged by the program as having poor health or satellite time segments that had cycle slips could be excluded, or the satellite elevation mask angle could be adjusted to improve the position solutions. The final differentially corrected precise DGPS positions were computed for each rover GPS session and exported in ASCII text format.
2011
Boat trajectory data files in ASCII text format.
Mark Hansen
U.S. Geological Survey
Oceanographer
mailing and physical address
600 Fourth St. South
St. Petersburg
FL
33701
727-502-8000
727-502-8032
mhansen@usgs.gov
Single-beam Bathymetry Processing- All data were processed using SANDS version 1.2. The primary purpose of SANDS is to time synchronize processed trajectories, soundings, and heave/pitch/roll, then merges all data strings. SANDS applies latency errors, applies geometric corrections for antenna staff pitch and roll, applies geometric corrections for antenna transducer pitch and roll (beam correction), time synchronizes the GPS trajectory and HYPACK files for each GPS epoch, and converts WGS84 latitude/longitude coordinates to North American Datum of 1983 NAD83/GRS80 UTM coordinates (m), and applies a geoid separation based upon the NOAA/NGS Geoid03 model. Latitude/longitude conversion to UTM coordinates was accomplished using NOAA/NGS UTM v2.0 software. Intermediate output files are comma delimited text files containing: time of day (seconds of day), UTM X coordinate (m), UTM Y coordinate (m), ellipsoid height, orthometric height, smoothed raw depths, Grafnav RMS value, and HYPACK line number. A header line indicates the attributes entry for each column.
Completely processed final XYZ files representing sea-floor elevations.
2011
Final processed bathymetry data files in ASCII text format.
Mark Hansen
U.S. Geological Survey (USGS) - St. Petersburg Coastal and Marine Science Center
Oceanographer
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
727-502-8000
727-502-8032
mhansen@usgs.gov
The final processed bathymetry files were reformatted for publication. UTM coordinate were converted to latitude/longitude using NOAA/NGS UTMS v2.0 software. Shapefiles were created from X,Y,Z text files using in-house developed software.
2015
DS1031-LemonB_WGS84_NAVD88-G03_SB.xyz.txt, DS1031-LemonB_WGS84_NAVD88-G03_SB.xyz.shp
U.S. Geological Survey
Mark Hansen
Oceanographer
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
(727) 502-8032
mhansen@usgs.gov
Added keywords section with USGS persistent identifier as theme keyword.
20201013
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
Point
Point
218513
0.0000001
0.0000001
decimal degrees
WGS84-G1150
WGS84
6378137.0
298.257223563
NAVD88
0.01
meters
Explicit depth coordinate included with horizontal coordinates
DS1031-LemonB_WGS84_NAVD88-G03_SB.xyz.txt, DS1031-LemonB_WGS84_NAVD88-G03_SB.xyz.shp
Post-processed, area-specific x,y,z attributed single-beam bathymetry data.
USGS
FID
Field ID
USGS
0
218513
longitude
WGS84(G1150) x-coordinate (easting) of sample point
NOAA/NGS UTMS
-82.43515
-82.26967
decimal degrees
0.00000001
latitude
WGS84(G1150) y-coordinate (northing) of sample point
NOAA/NGS UTMS
26.82385
27.04745
decimal degrees
0.00000001
z-ellipsoid height
WGS84(G1150) ellipsoid height of sample point, in meters
SANDS
-30.061
-24.245
meters
0.001
z-NAVD88
Orthometric height of sample point, in meters. Relative to geoid model Geoid03.
SANDS
-6.294
-0.478
meters
0.001
Mark E. Hansen
U.S. Geological Survey
Oceanographer
mailing and physical address
600 Fourth St. South
St. Petersburg
FL
33701
(727) 502-8000
(727) 502-8032
mhansen@usgs.gov
Single-beam bathymetry, vessel (R/V Streeterville, R/V Catboat, jet-ski, and canoe) acquired bathymetric data.
The data have no explicit or implied guarantees. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 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 or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein.
ASCII
https://pubs.usgs.gov/ds/1031/download/LemonB/soundings/DS1031-LemonBay_WGS84_NAVD88-G03_SB_txt.xyz.zip
none
20201013
U.S. Geological Survey
Mark Hansen
Oceanographer
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
mhansen@usgs.gov
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
The U.S. Geological Survey requests that it be referenced as the originator of this dataset in any future products or research derived from these data.
None
Unclassified
None