Short Citation:
Office for Coastal Management, 2021: RoxAnn Acoustic Sensor Data Points - Rehoboth Bay, Delaware Algae Mapping with Single Beam Acoustics: June 12 - 16, 2000, https://www.fisheries.noaa.gov/inport/item/47871.

Item Identification

Title: RoxAnn Acoustic Sensor Data Points - Rehoboth Bay, Delaware Algae Mapping with Single Beam Acoustics: June 12 - 16, 2000
Short Name: de_rb00_rox-meta
Status: Completed
Publication Date: 2001-05-09
Abstract:

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

Purpose:

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.

Notes:

10028

Supplemental Information:

Single beam acoustic data points (RoxAnn) collected in Rehoboth Bay, Delaware, June 12 - 16, 2000.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Benthic
Global Change Master Directory (GCMD) Science Keywords Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Coastal
Global Change Master Directory (GCMD) Science Keywords Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Estuary
ISO 19115 Topic Category biota
ISO 19115 Topic Category environment
None Acoustic
None Delaware Coastal Programs
None Environmental Monitoring
None Macroalgae
None Nuisance algae
None OCM Benthic Habitat Mapping
None RoxAnn
None Sea lettuce
None Ulva

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords Continent > North America > United States Of America > Delaware
None Atlantic
None Delaware
None Northeast
None Rehoboth Bay
None United States

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Data Presentation Form: Map (digital)
Distribution Liability:

Not for navigation.

Support Roles

Data Steward

CC ID: 610442
Date Effective From: 2001-05-09
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 610444
Date Effective From: 2001-05-09
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 610445
Date Effective From: 2001-05-09
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 610443
Date Effective From: 2001-05-09
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 610448
W° Bound: -75.137
E° Bound: -75.0756
N° Bound: 38.6938
S° Bound: 38.6332

Extent Group 1 / Time Frame 1

CC ID: 610447
Time Frame Type: Range
Start: 2000-06-12
End: 2000-06-16

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Vector Representation 1

CC ID: 610437
Point Object Present?: Yes
Point Object Count: 77953

Access Information

Security Class: Unclassified
Data Access Constraints:

None

Data Use Constraints:

Bathymetric data has not been corrected for tide and wind variables. Not for use in navigation.

Distribution Information

Distribution 1

CC ID: 750302
Download URL: ftp://ftp.coast.noaa.gov/pub/benthic/Single_Beam_Acoustic_Data/DE_RehobethBay_rox.zip
Distributor:
File Name: Bulk Download
Description:

FTP download of data files.

URLs

URL 1

CC ID: 750304
URL: https://coast.noaa.gov/
Name: NOAA's Office for Coastal Management (OCM) website
URL Type:
Online Resource
Description:

Information on the NOAA Office for Coastal Management (OCM)

Activity Log

Activity Log 1

CC ID: 610470
Activity Date/Time: 2017-03-30
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 610469
Activity Date/Time: 2017-11-14
Description:

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.

Activity Log 3

CC ID: 717641
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 750303
Activity Date/Time: 2018-04-11
Description:

Partial upload to move data access FTP links to Distribution Info and remove broken URLs.

Technical Environment

Description:

Arc/Info coverage format

Data Quality

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.

Lineage

Sources

RoxAnn Data Points

CC ID: 610434
Contact Name: Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM)
Publish Date: 2001-05-09
Extent Type: Range
Extent Start Date/Time: 2000-06-12
Extent End Date/Time: 2000-06-16
Source Contribution:

Unknown | Source Geospatial Form: map | Type of Source Media: Unknown

Process Steps

Process Step 1

CC ID: 610435
Description:

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.

Process Date/Time: 2000-06-19 00:00:00

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity (ENT) algae4.pat

Catalog Details

Catalog Item ID: 47871
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 12:57+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2019-07-02 15:17+0000
Metadata Record Published: 2018-04-11
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2019-04-12