Multibeam Mapping of Pulley Ridge, Gulf of Mexico, Key West, Florida

XYZ ASCII format high-resolution bathymetry data generated from the 2003, 2007, and 2009 combined multibeam sonar survey of Pulley Ridge, Gulf of Mexico, Key West, Florida.

These data are intended for science researchers, students, policy makers, and the general public. The data can be used with geographic information systems (GIS) or other software to display bathymetry data of the West Florida Shelf, Gulf of Mexico.

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.00002

Longitude_Resolution: 0.00002

Geographic_Coordinate_Units: Decimal Degrees

Geodetic_Model:

Horizontal_Datum_Name: WGS 84

Ellipsoid_Name: WGS 84

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 0.0033528106647475

Vertical_Coordinate_System_Definition:

Depth_System_Definition:

Depth_Datum_Name: Mean sea level

Depth_Resolution: 0.01

Depth_Distance_Units: meters

Depth_Encoding_Method: Attribute Values

Downloadable Data. Cruise dates R/V Suncoaster in 2003, 2007, and the R/V Weatherbird II in 2009 required.

Panama City Lab

These data not intended for navigational purposes. Although these data have been used by the University of South Florida, College of Marine Science, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Neither the University of South Florida or the State of Florida nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Trade, firm, or product names and other references to non-University of South Florida products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the University of South Florida or the State of Florida, as to their suitability, content, usefulness, functioning, completeness, or accuracy. Disclaimer- While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.

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Please recognize the University of South Florida as the source of this information.

KSI EM 710 2X2 degree acquisition system was used to collect the data using a SEAPATH Motion sensor. CARIS was used for post-processing. Processed GeoTIFF images were exported from CARIS for use in ArcGIS. Bathymetric data were post-processed using CARIS HIPS ver. 7.0 hydrographic data cleaning system software. Soundings were corrected for vessel motion using Kongsberg Seatex Motion Reference Unit (MRU), variations in water column sound velocity using Applied Microsystems smartSVP data, and adjusted for variations in water height (tides) using vertical position data from Kongsberg Seatex. Post-survey data cleaning, as well as Bathymetry Associated with Statistical Error (BASE) Surface creation using swath angle algorithm, were applied by CMWS. CMWS created final products from these post-processed multibeam bathymetry data. Soundings (xyz) were exported from a BASE Surface as an xyz text file. The xyz were imported into Fledermaus Dmagic ver. 7.1 to grid. In Dmagic, the 1m decimated xyz text files were interpolated into digital elevation model (DEM) grids. The Fledermaus grids were exported as ArcInfo ASCII raster files (.asc), which were converted into bathymetry ArcInfo grids in ArcGIS. Final x,y,z soundings, surface models, and derived products are relative to the NAD83 datum. Multibeam data were acquired using Kongsberg EM710 multibeam sonar system aboard the Lost Coast Explorer by University of South Florida. A Kongsberg Seatex Seapath system was used to provide position and attitude data during data collection and accounted for vessel motion such as heave, pitch, and roll (x and y position accuracy 1cm, z position accuracy 2cm, heading accuracy 0.05%, roll and pitch accuracy 0.03, heave accuracy 5% or 5cm). Altitude data were used to account for tide cycle fluctuations and sound velocity profiles were collected with an Applied Microsystems smart SV. The Center for Marine and Wetland Studies at Coastal Carolina University created final product.

Attribute Accuracy: No accuracy assessment was completed for this dataset. The instruments involved are capable of x and y position accuracy of 1cm, heading accuracy of 0.05% and roll and pitch accuracy of 0.03%. No tidal correction was made to the data. The instruments involved are capable of a z position accuracy of 2cm and heave accuracy of 5% or 5cm.

Horizontal Positional Accuracy: No accuracy assessment was completed for this dataset. The instruments involved are capable of x and y position accuracy of 1cm, heading accuracy of 0.05% and roll and pitch accuracy of 0.03%.

Vertical Positional Accuracy: No tidal correction was made to the data. The instruments involved are capable of a z position accuracy of 2cm and heave accuracy of 5% or 5cm.

As much data was collected as possible within the time constraints of the cruise.

The data are approximately set at a Mean Sea Level Chart datum but are not tide corrected, because tidal variation is a small percent (<0.01%) compared to the total depth. The tidal range is also less than the total accuracy of the data along these single transits and thus any slight offset is not observable within the data. The data crossing over a previous NOAA multibeam survey matched at 99% of total depth. Lead weight harbor verifications were done in both Key West and Pascagoula matching within 5 cm. Point features present. Similar scarps and bioherms were observed with the new data as was visible in the previous data collected by NOAA in a systematic survey along the slope of the west shelf of Florida in depths ranging from 300 to 700 meters.

Followed directions to operate hardware properly

N/A

Video data, too large to archive at this time.

The data resides on a secure government network requiring multi-factor authentication for network access.