47871
RoxAnn Acoustic Sensor Data Points - Rehoboth Bay, Delaware Algae Mapping with Single Beam Acoustics: June 12 - 16, 2000
de_rb00_rox-meta
Data Set
Published / External
37225
Benthic
Project
Completed
2001-05-09
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.
10028
Single beam acoustic data points (RoxAnn) collected in Rehoboth Bay, Delaware, June 12 - 16, 2000.
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 > DELAWARE
Theme
Acoustic
Theme
Delaware Coastal Programs
Theme
Environmental Monitoring
Theme
Macroalgae
Theme
Nuisance algae
Theme
OCM Benthic Habitat Mapping
Theme
RoxAnn
Theme
Sea lettuce
Theme
Ulva
Spatial
Atlantic
Spatial
Delaware
Spatial
Northeast
Spatial
Rehoboth Bay
Spatial
United States
Office for Coastal Management
Charleston
SC
Data Set
None Planned
Map (digital)
Not for navigation.
49274
algae4.pat
algae4.pat
Published / External
Completed
Point Attribute Table | Description Source: None
Converted from FGDC using 'fgdc_to_inport_xml_entity.pl' script.
1
Area
Unknown
No
No
Active
Area of polygon | Description Source: Software generated
Software computed
2
Perimeter
Unknown
No
No
Active
Perimeter of polygon | Description Source: Software generated
Software computed
3
Algae4#
Unknown
No
No
Active
Internal feature number | Description Source: Software generated
Software computed
4
Algae4-id
Unknown
No
No
Active
Feature identification number | Description Source: Software generated
User Defined
5
Y
NUMBER
No
No
Active
Longitude | Description Source: User defined
38.6334 - 38.6937
6
X
NUMBER
No
No
Active
Latitude | Description Source: User defined
-75.1368 - -75.0759
7
Depth
NUMBER
No
No
Active
Depth in meters collected by the RoxAnn acoustic sensor.These depths have not been corrected for tidal or wind influences. | Description Source: User defined
-2.41 - -0.48
8
E1
NUMBER
No
No
Active
Roughness (primary echo) | Description Source: User defined
0 - 2.036
9
E2
NUMBER
No
No
Active
Hardness (secondary echo) | Description Source: User defined
0 - 2.843
10
Time
Unknown
No
No
Active
Time | Description Source: User defined
Time
11
Date
Unknown
No
No
Active
Date of data collection (mm-dd-yy) | Description Source: User defined
Date
12
Scheme_cod
VARCHAR
No
No
Active
Habitats are given a numeric code following the benthic mapping SCHEME: Class 221 is for attached macroalge, Class 123 is for medium sand, 13 is for mixed fine sediments, 12 is for sand, 11 is for mud, and 7 is unknown benthic habitat. | Description Source: Field data
221: attached macroalgae | 123: medium sand | 13: mixed fine sediments | 12: sand | 11: mud | 7: unknown benthic habitat |
13
S_class
Unknown
No
No
Active
Habitats are classified as submersed aquatic vegetation, unconsolidated sediments or unknown benthic habitat. | Description Source: Unknown
Character Field
14
Subclass1
Unknown
No
No
Active
Submersed aquatic vegetation are classified as macroalgae, unknown sediments as mud, sand or mixed fine. | Description Source: Unknown
Character Field
15
Subclass2
Unknown
No
No
Active
Macroalgae are classified as attached macroalgae and sand as medium sand. | Description Source: Unknown
Character Field
16
Modifier
Unknown
No
No
Active
Attached macroalgae is present on some of the unconsolidated sediment classes. | Description Source: Unknown
Character Field
17
Taxonomic
Unknown
No
No
Active
When known, species and/or genus of macroalgae. | Description Source: Unknown
Character Field
Data Steward
2001-05-09
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
2001-05-09
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
2001-05-09
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
2001-05-09
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
-75.137
-75.0756
38.6938
38.6332
Range
2000-06-12
2000-06-16
Yes
Yes
77953
Unclassified
None
Bathymetric data has not been corrected for tide and wind variables. Not for use in navigation.
ftp://ftp.coast.noaa.gov/pub/benthic/Single_Beam_Acoustic_Data/DE_RehobethBay_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.
Arc/Info coverage format
This data is accurate to field conditions in June 2000. The depth points have not been corrected for tide and wind variables.
Not applicable
Not applicable
Data is complete.
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.
RoxAnn Data Points
Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM)
2001-05-09
Range
2000-06-12
2000-06-16
Unknown | Source Geospatial Form: map | Type of Source Media: Unknown
1
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
49274
Entity
algae4.pat
gov.noaa.nmfs.inport:47871
Anne Ball
2017-11-14T12:57:19
SysAdmin InPortAdmin
2023-05-30T18:09:28
2018-04-11
Office for Coastal Management
OCM
1002
Public
No
2018-04-11
1 Year
2019-04-11