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Summary
Item Identification
Keywords
Physical Location
Data Set Info
Support Roles
Extents
Access Info
Distribution Info
Tech Environment
Data Quality
Data Management
Lineage
Catalog Details

Summary

Short Citation
Alaska Fisheries Science Center, 2024: AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects: Side Scan Sonar Mosaic - Experimental tow in the mid-east region of CHPZ1., https://www.fisheries.noaa.gov/inport/item/28206.
Full Citation Examples

Abstract

Side-scan sonar images were collected using a Klein 2000 system and a 100/500-kHz towed ?sh that also contained a 3.5-kHz pro?ler source. A shipboard fathometer re- cording system was inoperable during the survey. The side-scan data were recorded digitally at a 10-kHz sample rate over a swath width of 100 m. Six swaths of 100-kHz data were anamorphosed, filtered, overlaid and projected to produce a spatially correct, georeferenced image of the seafloor with pixel resolution of 40 cm.

Distribution Information

Access Constraints:

None

Use Constraints:

The United States Government shall not be held liable for improper or incorrect use of data described and/or contained herein. These data and related graphics are not legal documents and are not intended to be used as such. The Alaska Fisheries Science Center gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. Spatial information may not meet National Map Accuracy Standards. The information contained in these data is dynamic and may change over time. Original data were compiled from various sources. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. It is strongly recommended that these data are directly acquired from an Alaska Fisheries Science Center server and not indirectly through other sources which may have changed the data in some way. Although these data have been used (processed) successfully on a computer system at the Alaska Fisheries Science Center, no warranty expressed or implied is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data.

Controlled Theme Keywords

geoscientificInformation

Child Items

No Child Items for this record.

Contact Information

Point of Contact
Steve Intelmann
steve.intelmann@noaa.gov
(206) 526-4157

Metadata Contact
Steve Intelmann
steve.intelmann@noaa.gov
(206) 526-4157

Extents

Geographic Area 1

-160.729892° W, -160.386336° E, 57.092484° N, 57.078774° S

Time Frame 1
1996 - 1997

Item Identification

Title: AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects: Side Scan Sonar Mosaic - Experimental tow in the mid-east region of CHPZ1.
Short Name: AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects: Side Scan Sonar Mosaic - Experimental tow in the mid-east region of CHPZ1.
Abstract:

Side-scan sonar images were collected using a Klein 2000 system and a 100/500-kHz towed ?sh that also contained a 3.5-kHz pro?ler source. A shipboard fathometer re- cording system was inoperable during the survey. The side-scan data were recorded digitally at a 10-kHz sample rate over a swath width of 100 m. Six swaths of 100-kHz data were anamorphosed, filtered, overlaid and projected to produce a spatially correct, georeferenced image of the seafloor with pixel resolution of 40 cm.

Purpose:

Benthic communities are structured by dynamically interacting factors that determine habitat quality. Since benthic macrofauna demonstrate strong and often narrowly defined affinities, forces altering (or disturbing) the environment will be of considerable importance to their distribution and abundance. Commercial fishing with mobile gear, such as bottom trawls and dredges, and the physical disturbance that results, is widespread in continental shelf areas. Because of its prevalence and the potential for adverse effects, there have been numerous attempts to quantify sea-floor exposure at various spatial scales. The well documented development of commerical fisheries in the eastern Bering Sea (EBS) since 1954 presents a unique opportunity for studying trawling impacts. The Crab and Halibut Protection Zone 1 (CHPZ1; also known as management area 512), located north of the Alaska Peninsula in Bristol Bay, has a long and complex history of trawl prohibitions that extend from 1959 to the present. Using detailed accounts of closures and fishing activity, it is possible to reconstruct historical effort and identify essentially pristine areas immediately adjacent to areas that have been heavily fished with bottom trawls. This physical arrangement permits an examination of chronic disturbance by bottom trawls, without confounding environmental effects that result from geographic separation. Sampling locations were preselected on the basis of historical fish effort.

Notes:

Loaded by FGDC Metadata Uploader, batch 7444, 10-27-2015 16:54

The following FGDC sections are not currently supported in InPort, but were preserved and will be included in the FGDC export:

- Spatial Reference Information (FGDC:spref),

- Spatial Data Organization Information (FGDC:spdoinfo)

Supplemental Information:

Tidally generated sea-floor lineations in Bristol Bay, Alaska, USA. M. S. Marlow, A. J. Stevenson, H. Chezar and R. A. McConnaughey. Geo-Marine Letters (1999) 19: 219-226.

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
geoscientificInformation
UNCONTROLLED
None Geomorphology
None Side Scan Sonar

Spatial Keywords

Thesaurus Keyword
UNCONTROLLED
None Bering Sea

Physical Location

Organization: Alaska Fisheries Science Center
City: Seattle
State/Province: WA
Country: USA

Data Set Information

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

Support Roles

Data Steward

CC ID: 247742
Date Effective From: 2015
Date Effective To:
Contact (Person): McConnaughey, Bob
Email Address: bob.mcconnaughey@noaa.gov

Distributor

CC ID: 247744
Date Effective From: 2015
Date Effective To:
Contact (Organization): Alaska Fisheries Science Center (AFSC)
Address: 7600 Sand Point Way N.E., Building 4
Seattle, WA 98115
USA
Email Address: afsc.webmaster@noaa.gov
Phone: (206) 526-4000
Fax: (206) 526-4004
URL: https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center
Business Hours: 0700-1700 Pacific Time

Metadata Contact

CC ID: 237199
Date Effective From: 2015-10-27
Date Effective To:
Contact (Person): Intelmann, Steve
Address: 7600 Sand Point Way N.E., Building 4
Seattle, WA 98115
USA
Email Address: steve.intelmann@noaa.gov
Phone: (206) 526-4157
Fax: (206) 526-6723

Point of Contact

CC ID: 237200
Date Effective From: 2015-10-27
Date Effective To:
Contact (Person): Intelmann, Steve
Address: 7600 Sand Point Way N.E., Building 4
Seattle, WA 98115
USA
Email Address: steve.intelmann@noaa.gov
Phone: (206) 526-4157
Fax: (206) 526-6723

Extents

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 237198
W° Bound: -160.729892
E° Bound: -160.386336
N° Bound: 57.092484
S° Bound: 57.078774

Extent Group 1 / Time Frame 1

CC ID: 248460
Time Frame Type: Range
Start: 1996
End: 1997

Access Information

Security Class: Unclassified
Data Access Procedure:

unknown

Data Access Constraints:

None

Data Use Constraints:

The United States Government shall not be held liable for improper or incorrect use of data described and/or contained herein. These data and related graphics are not legal documents and are not intended to be used as such. The Alaska Fisheries Science Center gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. Spatial information may not meet National Map Accuracy Standards. The information contained in these data is dynamic and may change over time. Original data were compiled from various sources. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. It is strongly recommended that these data are directly acquired from an Alaska Fisheries Science Center server and not indirectly through other sources which may have changed the data in some way. Although these data have been used (processed) successfully on a computer system at the Alaska Fisheries Science Center, no warranty expressed or implied is made regarding the utility of the data on another system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data.

Distribution Information

Distribution 1

CC ID: 247746
Download URL: https://www.ncei.noaa.gov
Distributor:

Technical Environment

Description:

Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.0.4322

Data Quality

Quality Control Procedures Employed:

see process Steps

Data Management

Have Resources for Management of these Data Been Identified?: No
Approximate Percentage of Budget for these Data Devoted to Data Management: Unknown
Do these Data Comply with the Data Access Directive?: No
Is Access to the Data Limited Based on an Approved Waiver?: Yes
If Distributor (Data Hosting Service) is Needed, Please Indicate: Yes
Approximate Delay Between Data Collection and Dissemination: Unknown
Actual or Planned Long-Term Data Archive Location: NCEI-MD
Approximate Delay Between Data Collection and Archiving: unknown
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

IT Security and Contingency Plan for the system establishes procedures and applies to the functions, operations, and resources necessary to recover and restore data as hosted in the Western Regional Support Center in Seattle, Washington, following a disruption.

Lineage

Process Steps

Process Step 1

CC ID: 237203
Description:

Side-scan sonar images were collected using a Klein 2000 system and a 100/500-kHz towed ?sh that also contained a 3.5-kHz pro?ler source. The side-scan data were recorded digitally at a 10-kHz sample rate over a swath width of 100 m. A single line of 100-kHz data was anamorphosed, filtered, overlaid and projected to produce a spatially correct, georeferenced image of the seafloor with pixel resolution of 40 cm. Grey scale stretch was applied to the data for visual aesthetics. Data were processed using USGS MIPS, where an img and lbl and file was created. The img and lbl file were then converted to bil and hdr format.

Process Step 2

CC ID: 237204
Description:

The bil and hdr file were imported into a raster file geodatabase in ArcGIS and assigned a projection

Catalog Details

Catalog Item ID: 28206
GUID: gov.noaa.nmfs.inport:28206
Metadata Record Created By: Nancy Roberson
Metadata Record Created: 2015-10-27 16:54+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2024-01-15 12:08+0000
Metadata Record Published: 2019-05-31
Owner Org: AFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2019-05-31
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2020-05-31