Improving Aleutian Islands Bathymetry Through 2019

This project added more detail to our previously published smooth sheet bathymetry of the Aleutian Islands from 2013 so that we could improve the quality of our National Marine Fisheries Service (NMFS) bottom trawl survey bathymetry-based strata, improve our NMFS bottom trawl survey relative biomass...

Full description

Bibliographic Details
Main Authors: Mark Zimmermann, Megan Prescott, Christopher Rooper, Paul Spencer
Format: Dataset
Language:unknown
Published: Research Workspace 2017
Subjects:
Online Access:https://search.dataone.org/view/10.24431_rw1k6bs_20220104T210629Z
id dataone:10.24431_rw1k6bs_20220104T210629Z
record_format openpolar
spelling dataone:10.24431_rw1k6bs_20220104T210629Z 2024-10-03T18:46:01+00:00 Improving Aleutian Islands Bathymetry Through 2019 Mark Zimmermann Megan Prescott Christopher Rooper Paul Spencer BEGINDATE: 1924-01-01T08:00:00Z ENDDATE: 2018-01-01T08:00:00Z 2017-01-01T00:00:00Z https://search.dataone.org/view/10.24431_rw1k6bs_20220104T210629Z unknown Research Workspace CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA EARTH SCIENCE SERVICES > DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS Sebastes polyspinis northern rockfish Gadus macrocephalus Pacific cod, morue du Pacifique, bacalao del Pacifico Sebastes alutus Pacific ocean perch Pleurogrammus monopterygius Atka mackerel Pacific ocean perch Pacific cod Atka mackerel stratified essential fish habitat bathymetry Aleutian echosounder multibeam bottom trawl Aleutian Islands passes North Pacific Research Board Dataset 2017 dataone:urn:node:RW 2024-10-03T18:18:00Z This project added more detail to our previously published smooth sheet bathymetry of the Aleutian Islands from 2013 so that we could improve the quality of our National Marine Fisheries Service (NMFS) bottom trawl survey bathymetry-based strata, improve our NMFS bottom trawl survey relative biomass estimates, and improve our stock assessments. Smooth sheets are the original, highly detailed precursors to the navigational charts, and we have developed the methods of working with them to publish the most detailed and accurate bathymetry for several regions of Alaska. NPRB Project 1604 provided funding for 1.5 years of the continued work of a highly trained and experienced GIS technician to revise our 2013 Aleutians smooth sheet bathymetry by accomplishing several specific objectives. 1) We digitized the shoreline of 3,009 islands for a total of 3,272 segments with a total length of 8,228,814 meters, all annotated with the MHW (Mean High Water) value from the smooth sheets (Shoreline.zip). 2) We proofed, edited and digitized 187,177 cartographic features including depths or elevations whenever they were available (Features.zip). We incorporated available 3) multibeam and 4) single-beam data into a new 5) 100 m horizontal resolution final depth surface (ai_grid_100m.zip), improving our description of deeper, offshore seafloor features and decreasing the previous gap of coverage around northern Atka Island, Amlia Island, and Seguam Island. 6) From this new depth surface we created new NMFS bottom trawl survey strata and used them to recalculate new biomass and variance estimates. In general, biomass changes were small but strata shifted spatially, as a result of more accurate depth contours (please see final report for details). 7) We calculated the size, maximum depth, maximum through depth, length, and tortuosity for the limiting passes (AI_Passes.zip). These passes serve as small connections between the North Pacific and Bering Sea. Inventory: ai_grid_100m,zip AI_Passes.zip Features.zip Shoreline.zip Dataset Bering Sea Alaska Aleutian Islands Research Workspace (via DataONE) Atka ENVELOPE(151.789,151.789,60.835,60.835) Bering Sea Pacific
institution Open Polar
collection Research Workspace (via DataONE)
op_collection_id dataone:urn:node:RW
language unknown
topic CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA
EARTH SCIENCE SERVICES > DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS
Sebastes polyspinis
northern rockfish
Gadus macrocephalus
Pacific cod, morue du Pacifique, bacalao del Pacifico
Sebastes alutus
Pacific ocean perch
Pleurogrammus monopterygius
Atka mackerel
Pacific ocean perch
Pacific cod
Atka mackerel
stratified
essential fish habitat
bathymetry
Aleutian
echosounder
multibeam
bottom trawl
Aleutian Islands
passes
North Pacific Research Board
spellingShingle CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA
EARTH SCIENCE SERVICES > DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS
Sebastes polyspinis
northern rockfish
Gadus macrocephalus
Pacific cod, morue du Pacifique, bacalao del Pacifico
Sebastes alutus
Pacific ocean perch
Pleurogrammus monopterygius
Atka mackerel
Pacific ocean perch
Pacific cod
Atka mackerel
stratified
essential fish habitat
bathymetry
Aleutian
echosounder
multibeam
bottom trawl
Aleutian Islands
passes
North Pacific Research Board
Mark Zimmermann
Megan Prescott
Christopher Rooper
Paul Spencer
Improving Aleutian Islands Bathymetry Through 2019
topic_facet CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA
EARTH SCIENCE SERVICES > DATA ANALYSIS AND VISUALIZATION > GEOGRAPHIC INFORMATION SYSTEMS
Sebastes polyspinis
northern rockfish
Gadus macrocephalus
Pacific cod, morue du Pacifique, bacalao del Pacifico
Sebastes alutus
Pacific ocean perch
Pleurogrammus monopterygius
Atka mackerel
Pacific ocean perch
Pacific cod
Atka mackerel
stratified
essential fish habitat
bathymetry
Aleutian
echosounder
multibeam
bottom trawl
Aleutian Islands
passes
North Pacific Research Board
description This project added more detail to our previously published smooth sheet bathymetry of the Aleutian Islands from 2013 so that we could improve the quality of our National Marine Fisheries Service (NMFS) bottom trawl survey bathymetry-based strata, improve our NMFS bottom trawl survey relative biomass estimates, and improve our stock assessments. Smooth sheets are the original, highly detailed precursors to the navigational charts, and we have developed the methods of working with them to publish the most detailed and accurate bathymetry for several regions of Alaska. NPRB Project 1604 provided funding for 1.5 years of the continued work of a highly trained and experienced GIS technician to revise our 2013 Aleutians smooth sheet bathymetry by accomplishing several specific objectives. 1) We digitized the shoreline of 3,009 islands for a total of 3,272 segments with a total length of 8,228,814 meters, all annotated with the MHW (Mean High Water) value from the smooth sheets (Shoreline.zip). 2) We proofed, edited and digitized 187,177 cartographic features including depths or elevations whenever they were available (Features.zip). We incorporated available 3) multibeam and 4) single-beam data into a new 5) 100 m horizontal resolution final depth surface (ai_grid_100m.zip), improving our description of deeper, offshore seafloor features and decreasing the previous gap of coverage around northern Atka Island, Amlia Island, and Seguam Island. 6) From this new depth surface we created new NMFS bottom trawl survey strata and used them to recalculate new biomass and variance estimates. In general, biomass changes were small but strata shifted spatially, as a result of more accurate depth contours (please see final report for details). 7) We calculated the size, maximum depth, maximum through depth, length, and tortuosity for the limiting passes (AI_Passes.zip). These passes serve as small connections between the North Pacific and Bering Sea. Inventory: ai_grid_100m,zip AI_Passes.zip Features.zip Shoreline.zip
format Dataset
author Mark Zimmermann
Megan Prescott
Christopher Rooper
Paul Spencer
author_facet Mark Zimmermann
Megan Prescott
Christopher Rooper
Paul Spencer
author_sort Mark Zimmermann
title Improving Aleutian Islands Bathymetry Through 2019
title_short Improving Aleutian Islands Bathymetry Through 2019
title_full Improving Aleutian Islands Bathymetry Through 2019
title_fullStr Improving Aleutian Islands Bathymetry Through 2019
title_full_unstemmed Improving Aleutian Islands Bathymetry Through 2019
title_sort improving aleutian islands bathymetry through 2019
publisher Research Workspace
publishDate 2017
url https://search.dataone.org/view/10.24431_rw1k6bs_20220104T210629Z
op_coverage BEGINDATE: 1924-01-01T08:00:00Z ENDDATE: 2018-01-01T08:00:00Z
long_lat ENVELOPE(151.789,151.789,60.835,60.835)
geographic Atka
Bering Sea
Pacific
geographic_facet Atka
Bering Sea
Pacific
genre Bering Sea
Alaska
Aleutian Islands
genre_facet Bering Sea
Alaska
Aleutian Islands
_version_ 1811923344119824384