gov.noaa.nmfs.inport:47871 eng UTF8 dataset Office for Coastal Management resourceProvider NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information pointOfContact 2026-04-30T00:00:00 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) point 77953 RoxAnn Acoustic Sensor Data Points - Rehoboth Bay, Delaware Algae Mapping with Single Beam Acoustics: June 12 - 16, 2000 de_rb00_rox-meta 2001-05-09 publication NOAA/NMFS/EDM 47871 https://www.fisheries.noaa.gov/inport/item/47871 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information https://coast.noaa.gov/ WWW:LINK-1.0-http--link NOAA's Office for Coastal Management (OCM) website Information on the NOAA Office for Coastal Management (OCM) download mapDigital During the spring of 1999, the Delaware Coastal Programs(DCP) identified the spatial extent of macroalgae in the shallow portions of Rehoboth Bay utilizing traditional photogrammetric methods. The DCP used true color aerial photographs, image processing software, a geographical information system (GIS), and a limited field survey to identify 1.88 square kilometers of macroalgae in all but the deepest parts of the bay. Turbid conditions prevented identification of the full extent of the vegetation.Although the 1999 effort was highly successful, it was clear that aerial photography could not penetrate to the deeper parts of the bay or where conditions were turbid.For the 2000 effort, the DCP partnered with the National Oceanic and Atmospheric Administration (NOAA) Office for Coastal Management Coastal Remote Sensing Program. The Benthic Habitat Mapping project, a part of the Center's Coastal Remote Sensing program, utilized a RoxAnn acoustic sensor to identify benthic cover in turbid areas of the bay June 12- 16, 2000.The instrument was used to identify bottom type by extracting data on bottom roughness and bottom hardness from the primary and secondary sounder echoes. The data is classified on-the-fly, using a towed video camera for field validation, and subject to a post-processing classification. The unit collected data throughout the bay in areas greater than 1.4 meters in depth and serves as a powerful complement to the aerial photography. The RoxAnn data points were exported into a geographic information system (GIS) and post-processed to remove unreliable data points and re-classified. This data set is comprised of the cleaned, attributed point data. The attributes include location, date, time, depth, field derived classification,and the classification derived from post-processing the data. This system is fully described in "Development of a System for Classification of Habitats in Estuarine and Marine Environments (SCHEME) for Florida, Report to U.S. EPA - Gulf of Mexico Program, Florida Fish and Wildlife Conservation Commission, Florida Marine Research Institute.Review Draft 12/04/02." Original contact information: Contact Org: NOAA Office for Coastal Management Phone: 843-740-1202 Email: coastal.info@noaa.gov Every year more boaters, fishers, and other recreational users place a larger strain on the limited space and natural resources of Rehoboth Bay, Delaware. At the same time, regional development, agricultural, and industrial activities impact the bay with increased runoff of chemicals and nutrients. A particular genus of macroalgae known as Ulva grows in these waters naturally, but has become an increasing problem with greater biomass due to changing water chemistry. Ulva management in Rehoboth Bay has challenged government agencies and local organizations for a number of years. Increases in Ulva biomass can lead to an increase in dead organic matter and to reduced dissolved oxygen levels in the bay. Lower dissolved oxygen can have a significant impact on the local aquatic ecology,increased dead organic loads can cause foul odors and create hazards for boats.Government agencies have funded Ulva collection operations to reduce the impacts of the macroalgae on the ecosystem and on recreational opportunities in Rehoboth Bay.Unfortunately, little data exists on the spatial extent of Ulva in Rehoboth Bay or the effectiveness of the collection operations. It seems imperative that the agencies funding the operations identify the present extent of Ulva in the bay and periodically update that information to determine the effectiveness of their efforts. completed NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information pointOfContact NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information custodian notPlanned EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > COASTAL EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > ESTUARY theme Global Change Master Directory (GCMD) Science Keywords 23.3 CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > DELAWARE place Global Change Master Directory (GCMD) Location Keywords 23.3 Acoustic Delaware Coastal Programs Environmental Monitoring Macroalgae Nuisance algae OCM Benthic Habitat Mapping RoxAnn Sea lettuce Ulva theme Atlantic Delaware Northeast Rehoboth Bay United States place DOC/NOAA/NOS/OCM > Office of Coastal Management, National Ocean Service, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2017-04-24 publication 8.5 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Benthic project InPort otherRestrictions Cite As: Office for Coastal Management, [Date of Access]: RoxAnn Acoustic Sensor Data Points - Rehoboth Bay, Delaware Algae Mapping with Single Beam Acoustics: June 12 - 16, 2000 [Data Date Range], https://www.fisheries.noaa.gov/inport/item/47871. NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose. otherRestrictions Access Constraints: None otherRestrictions Use Constraints: Bathymetric data has not been corrected for tide and wind variables. Not for use in navigation. otherRestrictions Distribution Liability: Not for navigation. unclassified vector eng; US biota environment Arc/Info coverage format -75.137 -75.0756 38.6332 38.6938 | Currentness: Ground Condition 2000-06-12 2000-06-16 Single beam acoustic data points (RoxAnn) collected in Rehoboth Bay, Delaware, June 12 - 16, 2000. false eng false algae4.pat 2017-11-16 publication NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information distributor ftp://ftp.coast.noaa.gov/pub/benthic/Single_Beam_Acoustic_Data/DE_RehobethBay_rox.zip WWW:LINK-1.0-http--link Bulk Download FTP download of data files. download dataset Accuracy This data is accurate to field conditions in June 2000. The depth points have not been corrected for tide and wind variables. Horizontal Positional Accuracy Not applicable Vertical Positional Accuracy Not applicable Completeness Report Data is complete. Conceptual Consistency The data were collected with the RoxAnn acoustic sensor in a geographic projection. The field database was exported from RoxMap software as a text file. Unreliable data points(i.e. data with impossible bathymetry) were deleted. Using ArcInfo, the point data were converted to both a shapefile and coverage, and reprojected to US State Plane Nad83, Delaware. In June of 2000, the RoxAnn acoustic sensor was run in North-South and East-West transects across Rehoboth bay,recording geographically referenced point measurements of the acoustic data. The RoxAnn system analyzes two acoustic signals, bottom roughness (E1) and bottom hardness (E2).The ratios of these two measurements were calibrated in the field to known bottom types. Ground-truthing the measurements in the field was accomplished by under water video, grab samples and visual verification. The field database collected from June 12 - 16, 2000 was exported from the RoxMap software as a text file.Unreliable data points indicated by impossible bathymetry data were removed (i.e. depths in excess of 3 meters). In addition, series of identical points were reduced to the initial value and the remaining points from the data set.The fifteen original field derived classes developed in the field varied in level of descriptiveness: ulva; mud and algae; sand and algae; algae; gracilaria; gracilaria on mud; sand; bioturbated mud; shell/mud/algae; sandy mud;hard sand; mud with 15% algae; soft mud; mud and unknown.These overlapping and varying classifications were grouped to four general classes which comprised the bottom types observed equally general: algae (greater than 15%), mud(15% algae cover or less on soft mud), sand (15% algae or less on harder mud/sand) and unknown. The benthic data was then classified according to the System for Classification of Habitats in Estuarine and Marine Environments (SCHEME).This system is fully described in "Development of a System for Classification of Habitats in Estuarine and Marine Environments (SCHEME) for Florida, Report to U.S. EPA -Gulf of Mexico Program, Florida Fish and Wildlife Conservation Commission, Florida Marine Research Institute.Review Draft 12/04/02." These classes were then aggregated to either algae or no algae classes. 2000-06-19T00:00:00 Source Contribution: Unknown | Source Geospatial Form: map | Type of Source Media: Unknown RoxAnn Data Points 2001-05-09 publication Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM) 2000-06-12 2000-06-16