47885 fl_dt01_rox-meta Data Set Published / External 37225 Benthic Project Completed 2005-08-01 During April 2001 RoxAnn single-beam acoustic surveys were conducted at the North Unit of the Tortugas Ecological Reserve, Florida. Thirteen transects associated with fixed bottom sampling stations were surveyed to characterize the ecotone around the stations. In addition survey tracks were run along the outer edge of the Tortugas platform reef complex and into the interior of the platform. A towed video sled (minibat) was deployed simultaneously with the RoxAnn survey which provided a live video ground truth to the acoustic signals. Using this ground truth several bottom classes were identified including coral, seagrass, algae, unconsolidated sediments, and hardbottoms. The original RoxAnn categories are preserved in the Class field and benthic habitat codes from the Florida System for Classifying Estuarine and Marine Environments (SCHEME) system are preserved in the SCHEME field. The depth value is in meters below transducer surface. Original contact information: Contact Org: NOAA Office for Coastal Management Phone: 843-740-1202 Email: coastal.info@noaa.gov The single-beam surveys were part of a larger biogeographic characterization effort intended to characterize benthic habitats, ocean circulation patterns, in the newly established Tortugas Ecological Reserve. The goal of the project was to establish a baseline of environmental conditions and processes that could be compared to future surveys. This would support evaluations of various reserve management strategies. 10042 Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > COASTAL Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > ESTUARY Theme ISO 19115 Topic Category biota Theme ISO 19115 Topic Category environment Spatial Global Change Master Directory (GCMD) Location Keywords CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > FLORIDA Spatial Global Change Master Directory (GCMD) Location Keywords OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF AMERICA Theme Benthic Habitat Theme CoRIS Theme Depth Theme Environmental Monitoring Theme OCM Benthic Habitat Mapping Theme RoxAnn Theme SCHEME Theme Single-Beam Acoustics Spatial Dry Tortugas Spatial Florida Spatial Florida Keys National Marine Sanctuary Spatial Gulf of Mexico Spatial Tortugas Ecological Reserve Office for Coastal Management Charleston SC Data Set None Planned Map (digital) Single-beam acoustic data points collected in the Dry Tortugas area of Florida. While every effort has been made to ensure that these data are accurate and reliable within limits of the state of the art, NOAA will not assume any liability for damages caused by any inaccuracies in these data, or failure in their use. 49287 fl_dt01.dbf Published / External Completed Shapefile Attribute Table | Description Source: None Converted from FGDC using 'fgdc_to_inport_xml_entity.pl' script. 1 Class NUMBER No No Active Unknown | Description Source: Unknown 0 - 30 2 Latitude NUMBER No No Active Unknown | Description Source: Unknown 24.52 - 24.7381 3 Longitude NUMBER No No Active Unknown | Description Source: Unknown -82.9984 - -82.7639 4 Depth NUMBER No No Active Unknown | Description Source: Unknown -35.55 - -5.59 5 E1 NUMBER No No Active Unknown | Description Source: Unknown 0.029 - 2.64 6 E2 NUMBER No No Active Unknown | Description Source: Unknown 0.02 - 1.289 7 Time Unknown No No Active Unknown | Description Source: Unknown Eastern Daylight Time 8 Date_ Unknown No No Active Unknown | Description Source: Unknown Date 9 Scheme NUMBER No No Active Unknown | Description Source: Unknown 3 - 342 10 Modifier Unknown No No Active Unknown | Description Source: Unknown SCHEME Modifier 11 Habitat Unknown No No Active Unknown | Description Source: Unknown Habitat Description Data Steward 2005-08-01 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Distributor 2005-08-01 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Metadata Contact 2005-08-01 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Point of Contact 2005-08-01 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Ground Condition -82.99687858505 -82.76481755499 24.73908925585 24.51945289841 Range 2001-04-08 2001-04-12 Yes Yes 25933 Unclassified None Bathymetric data have not been corrected for tide and wind variables. Not for use in navigation. ftp://ftp.coast.noaa.gov/pub/benthic/Single_Beam_Acoustic_Data/FL_DryTortugas_rox.zip Bulk Download FTP download of data files. https://coast.noaa.gov/ NOAA's Office for Coastal Management (OCM) website Online Resource Information on the NOAA Office for Coastal Management (OCM) 2017-03-30 Date that the source FGDC record was last modified. 2017-11-14 Converted from FGDC Content Standard for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details. 2018-02-08 Partial upload of Positional Accuracy fields only. 2018-04-11 Partial upload to move data access FTP links to Distribution Info and remove broken URLs. ArcView version 3.2 shapefile format This data is accurate to field conditions in April 2001. The depth readings have not been corrected for tide stage or wind variables. A towed video system (mini-bat) was deployed behind the vessel where the acoustic transducer was deployed. This provided real-time ground-truth to the acoustic signals. As habitat boundaries were crossed, the RoxAnn acoustic signature box was updated and checked. In addition dive observations were made along the transects to verify the habitat classes. The horizontal positional accuracy is based on the accuracy of the GPS used to generate the coordinate pair for each acoustic record. The GPS unit was a military grade receiver enabled to receive encrypted Y-code from the GPS satellites. his typically produces a spatial accuracy of 10 meters or less. Depth value is in meters below transducer. No correction has been applied for wind or tide effects. No validation was performed on this data and no accuracy is implied. The data is complete. These data are believed to be logically consistent, though no tests have been performed. Point geometry is topologically clean. Dry Tortugas RoxAnn Points Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM) 2005-08-01 Range 2001-04-08 2001-04-12 Unknown | Source Geospatial Form: map | Type of Source Media: map 1 Between 8 and 12 April 2001 RoxAnn single-beam acoustic data were collected along 16 transects running across the edge of the Tortugas platform reef. The transducer was mounted on a pole attached to the side of the research vessel and was co-located with a PLGR GPS unit. Data were recorded at 1 second intervals. The E1 and E2 signals received were displayed and logged in the normal RoxMap Scientific software environment. The vessel speed during collection was approximately 4 kts. Simultaneous to collection of the acoustic data a towed video sled was deployed astern of the ship. The picture from this video was displayed in the lab within view of the RoxAnn data analyst. This allowed a near real-time reference for the acoustic data. This ground-truth was used to assign the RoxAnn soundings into several bottom classes. At the conclusion of each transect run. The instrument was shut off until the next transect was visited. 2001-04-01T00:00:00 2 The full RoxAnn record collected during the April cruise was exported from the RoxMap environment and converted into ESRI shapefile format for further analysis. A set of tools developed at OCM specifically for cleaning RoxAnn data were used to remove noise and anomalous points from the record. These points included spikes and pits in the bathymetry as well as bad data caused by surface turbulence. Each bottom class in the data was then exported individually and displayed on a scatterplot of E1 vs. E2 values to examine its geometry. The cluster means (E1 and E2) for each class were also displayed relative to each other as a logical check between classes. The final results were recoded into the Florida SCHEME benthic habitat classification system to ensure consistency with other OCM benthic data. 2003-12-01T00:00:00 49287 Entity gov.noaa.nmfs.inport:47885 Anne Ball 2017-11-14T12:57:25 Brianna Key 2025-04-30T22:37:01 2018-04-11 Office for Coastal Management OCM 1002 Public No No 2018-04-11 1 Year 2019-04-11