AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects: Side Scan Sonar Mosaic - Experimental tow in the mid-east region of CHPZ1.
Alaska Fisheries Science Center
Data Set
(DS)
| ID: 28206
| Published / External
Created: 2015-10-27
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Last Modified: 2024-01-15
Project (PRJ) | ID: 32330
ID: 28206
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects: Side Scan Sonar Mosaic - Experimental tow in the mid-east region of CHPZ1. |
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Short Name | AFSC/RACE/GAP/McConnaughey: Trawlex Chronic Effects: Side Scan Sonar Mosaic - Experimental tow in the mid-east region of CHPZ1. |
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• Publication Date | |
* » 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) |
Other Citation Details | |
• 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. |
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Keywords
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ISO 19115 Topic Category | geoscientificInformation |
None | Geomorphology |
None | Side Scan Sonar |
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* Spatial Keywords
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None | Bering Sea |
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• » Organization | Alaska Fisheries Science Center |
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• » City | Seattle |
• » State/Province | WA |
• Country | USA |
• » Location Description |
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* Data Set Scope Code | Data Set |
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• Maintenance Frequency | None Planned |
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» Data Presentation Form | Map (digital) |
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* » Support Role | Data Steward |
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* » Date Effective From | 2015 |
Date Effective To | |
Person | McConnaughey, Bob |
Email Address | bob.mcconnaughey@noaa.gov |
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* » Support Role | Distributor |
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* » Date Effective From | 2015 |
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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 |
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URL | https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center |
Business Hours | 0700-1700 Pacific Time |
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* » Support Role | Metadata Contact |
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* » Date Effective From | 2015-10-27 |
Date Effective To | |
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 |
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* » Support Role | Point of Contact |
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* » Date Effective From | 2015-10-27 |
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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 |
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Extent Group 1 / Geographic Area 1
* » W° Bound | -160.729892 |
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* » E° Bound | -160.386336 |
* » N° Bound | 57.092484 |
* » S° Bound | 57.078774 |
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* » Start | 1996 |
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unknown |
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• 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. |
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» Download URL | https://www.ncei.noaa.gov |
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Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.0.4322 |
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» Have Resources for Management of these Data Been Identified? | No |
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» 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 |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed | |
» 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. |
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» 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. |
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The bil and hdr file were imported into a raster file geodatabase in ArcGIS and assigned a projection |
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Catalog Details
Catalog Item ID | 28206 |
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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 Workflow State | Published / External |
Metadata Last Review Date | 2019-05-31 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2020-05-31 |
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