32490
AFSC/RACE/GAP/McConnaughey: South Arctic Reconnaissance-2012-GIS
Data Set
Published / External
32487
AFSC/RACE/GAP/McConnaughey: South Arctic Reconnaissance-2012
Project
Completed
2015-09-09
A custom designed Klein 7180 towed sonar was deployed from the NOAA Ship FAIRWEATHER to determine its value of acoustic backscatter as a habitat defining character. A Sonardyne Fusion USBL system was used to estimate underwater positioning of the towfish using an omnidirectional Wideband submini beacon operating in external trigger mode. Navigation data were logged in QINSy and exported into a text file. The towfish positions were then smoothed in Matlab using a custom script that implemented a weighted Hamming filter, using a window of 11 data points. These points represent the smoothed USBL navigation data for the Klein 7180 towfish during the Arctic reconnaissance transit from Dutch Harbor to Kotzebue. These smoothed towfish navigation data, however, will NOT ultimately be reinserted back into the sonar files for mosaicking and analysis. Rather, another navigation smoothing routine will be used for the final product.
The broad scope of the Essential Fish Habitat (EFH) mandate requires an efficient process for describing and mapping the habitat needs of federally managed species. For example, research indicates surficial sediments affect the distribution and abundance of many groundfish species, yet traditional sampling with grabs and cores is impractical over areas as large as the Bering Sea shelf. Acoustic tools are suitable for large-scale surveying and show great promise as a substitute for direct-sampling methods, but they have not been proven useful for EFH purposes. Acoustic seafloor surveys using different sonar systems were conducted along strong gradients of groundfish abundance, as determined from many years of RACE bottom trawl survey catches at fixed stations. Ultimately, the value of acoustic backscatter as a habitat defining character will be judged based on the statistical association between normalized backscatter and fish density. The benefits and costs of the different acoustic systems will be compared with data from multiple passes along the survey tracklines. Sediment samples, video and infauna collected along each trackline will provide additional biological and geological information for the analyses. Immediately following the Fishpac project during the summer of 2012, a single trackline was made between Dutch Harbor and Kotzebue Sound and various types of data were collected along the transit to get a glimpse at the seafloor habitat along the way.
Loaded by FGDC Metadata Uploader, batch 7099, 09-22-2015 16:56
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)
Theme
navigation
Theme
side scan sonar
Alaska Fisheries Science Center
Seattle
WA
USA
Data Set
None Planned
Map (digital)
see Process Steps
see Process Steps
see Process Steps
Data Steward
2015
Person
McConnaughey, Bob
bob.mcconnaughey@noaa.gov
Distributor
2015
Organization
Alaska Fisheries Science Center
AFSC
afsc.webmaster@noaa.gov
7600 Sand Point Way N.E., Building 4
Seattle
WA
98115
USA
(206) 526-4000
(206) 526-4004
https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center
AKFSC Home Page
Online Resource
0700-1700 Pacific Time
Metadata Contact
2015-09-22
Person
Intelmann, Steve
steve.intelmann@noaa.gov
7600 Sand Point Way N.E., Building 4
Seattle
WA
98115
USA
(206) 526-4157
(206) 526-6723
Point of Contact
2015
Person
McConnaughey, Bob
bob.mcconnaughey@noaa.gov
3 day transit
-175.318433
-165.798705
61.404316
12.068817
Range
2012-08-02
2012-08-04
Unclassified
unknown
None
None
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.
https://www.ncei.noaa.gov
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.0.4322
see Process Steps
No
Unknown
No
Yes
Yes
Unknown
no delay
NCEI-MD
unknown
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.
1
A Klein 7180 towfish was operated at the 500m-range scale and towed at roughly 7-8 knots from the NOAA Ship FAIRWEATHER while attempting to maintain a constant altitude of roughly 50 percent water depth. A Sonardyne Fusion USBL system was used to estimate underwater positioning of the towfish using an omnidirectional Wideband submini beacon operating in external trigger mode. A DWS fiber-optic winch was used to deploy and retrieve the towfish and positioning was obtained by USBL. An Applanix POS/MV was used to reference the Sonardyne XYZ coordinates which were controlled in QINSy. The REDAS driver in QINSy was used to pass both ship and towfish position to Sonarpro, which logged the sonar packets in SDF2 format. A T-Count was also used to capture cable out information and was also captured by QINSy. Navigation data were exported from QINSy into a text file. The towfish positions were then smoothed in Matlab using a custom script that implemented a weighted Hamming filter, using a window of 11 data points. The smoothed towfish navigation data were NOT reinserted back in to the raw sonar files for mosaicking. Point data from the text file were finally imported into ArcGIS.
2012-10-11T00:00:00
gov.noaa.nmfs.inport:32490
Theresa Smith
2016-04-20T12:16:37
SysAdmin InPortAdmin
2024-01-15T12:08:04
2019-05-31
Alaska Fisheries Science Center
AFSC
7600 Sand Point Way N.E., Building 4
Seattle
WA
98115
USA
http://www.afsc.noaa.gov
0700-1700 Pacific Time
1001
Public
No
2019-05-31
1 Year
2020-05-31