Deep Coral Cruise Data

2007-2010 Deep Coral Multibeam Survey Areas

The following zipped data products are available for download.

Multibeam Bathymetry and Derived Surfaces
Survey Map Multibeam data were collected with a hull-mounted Simrad EM 1002 multibeam SoNAR aboard the NOAA ship Nancy Foster, and from a Kongsberg EM 122 aboard the NOAA Ship Ron Brown. It was processed by a NOAA contractor using CARIS HIPS/SIPS v.7.0 software. Note: Verified tides were not applied to the data, leaving the depth values referenced to the ellipsoid. Slope (in degrees) and rugosity are derived from the gridded bathymetry surface, using ESRI’s Spatial Analyst extension and NOAA’s Benthic Habitat Modeler Toolbar, respectively. For more information about these derived surfaces, please see each dataset’s metadata (included in the zipped file). All products are in UTM zone 17N, datum NAD83, and are merged representations all deep coral priority areas on a given cruise.

This deepwater coral survey was produced by processing bathymetric data acquired from the 2010 Deep Coral Mission by NOAA Ship Ron Brown south of the Florida Keys. These broad banks of carbonate reefs are composed of deep water corals that grow with almost no light. Deep water corals are filter feeders that capture plankton and nutrients that pass through cold bottom water currents. This and other 10 meter datasets are available for download from the NOAA NOS CCMA Biogeography Team.

NOTE: The 3m surfaces for the 2010 Lost Coast Explorer are high resolution data sets that cover very large areas of the seafloor. These 3m surfaces may take a longer time to download and display in GIS than the 10m surfaces because of the large transfer sizes of the data. Please be aware of your computer's hard disk space and RAM capacity in order to optimize download speed and processing of the dataset.

TIFF Images (Georeferenced):
Deep Sea Coral Mission Resolution (in meters)
  Bathymetry Slope Rugosity
Ewing 1997 30 30 30
Whiting 2000 50 50 50
Whiting 2001 50 50 50
Pathfinder 2003 30 30 30
Little Hales 2003 30 30 30
Nancy Foster 2006 30 30 30
Thomas Jefferson 2007 30 30 30
Nancy Foster June 2007 (Gray's Reef Cruise) 10 10 10
Nancy Foster September 2009 10 10 10
Ron Brown November 2010 10 10 10
Lost Coast Explorer 2010 3 3 3

Multibeam Backscatter
The backscatter values of this imagery are not a mesure of the decibel output of the multibeam data Backscatter data were collected using a Simrad EM 1002 and Kongsburg Em 122 multibeam echosounder. The data were corrected for geometric and radiometric distortions using Geocoder.

In particular, the following corrections were applied when artifacts were evident: AVG Flat, TX Power and RX Gain, Area Correction, Spherical Spreading, Tx and Rx Beam Patterns, Navigation attitude, Transducer Attitude and Slant-Range Distortion. The final mosaics were exported as GeoTIFFs in relative 8-bit (0 – 255) values for use in a GIS.

Acoustic backscatter mosaics are ostensibly an important piece of information when characterizing surficial seafloor features and delineating benthic habitats.

Backscatter imagery is produced by deriving the acoustic intensity from the multibeam data. Low intensity areas are dark from fine sediments like mud. High intensity areas are from coarse bottom types such as coral reefs.

TIFF Images (Georeferenced):
Deep Sea Coral Mission Resolution (in meters)
Pathfinder 2003 30
Nancy Foster 2006 50
Thomas Jefferson 2007 50
Nancy Foster June 2007 (Gray's Reef Cruise) 5
Nancy Foster September 2009 10
Ron Brown November 2010 10
Lost Coast Explorer 2010 3

Underwater Photography & Video Exploration
A remotely operated vehicle (ROV) and was employed on several cruises to acquire video and high resolution still photos of the seafloor. The locations of these videos and photos are available for download (below) as point and polyline ESRI shapefiles in NAD83 UTM 17N.

Shapefiles
Deep Sea Coral Mission Shapefile Type File name
Seward Johnson August 2009 ROV (Polyline) Coming Soon