22903 AFSC/RACE/GAP/Zimmermann: Central Gulf of Alaska Bathymetry Features Data Set Published / External 22291 Groundfish Assessment Program Project Completed 2015 We assembled 1.75 million National Ocean Service (NOS) bathymetric soundings from 225 lead-line and single-beam echosounder hydrographic surveys conducted from 1901 to 1999 in the central Gulf of Alaska. These bathymetry data are available from the National Geophysical Data Center (NGDC: http://www.ngdc.noaa.gov), which archives and distributes data that were originally collected by the NOS and others. While various bathymetry data have been downloaded previously from NGDC, compiled, and used for a variety of projects, our effort differed in that we compared and corrected the digital bathymetry by studying the original analog source documents - digital versions of the original survey maps, called smooth sheets. Our editing included deleting erroneous and superseded values, digitizing missing values, and properly aligning all data sets to a common, modern datum. There were several areas where these older surveys were superseded by more recent, higher quality multibeam surveys, mostly from the NOS (n=106). Three of these were unprocessed NOS multibeam surveys in the Sitka area, which we edited and processed into final bathymetric surfaces. We reduced the resolution of these multibeam surveys to 100 m, since some may have sub-meter resolution and many exceed a million soundings, and added them to our bathymetry compilation. We proofed, edited or digitized 96,000 cartographic features (mostly from the smooth sheets, some from the multibeam surveys), such as rocky reefs, kelp beds, rocks and islets, creating the most thorough source of these typically shallow, inshore features. The depth surface and inshore features, available at the Alaska Fisheries Science Center (AFSC: http://www.afsc.noaa.gov), were mostly produced at a map scale of 1:20,000. The purpose for creating this data set was to provide the best available bathymetry and inshore features of the central Gulf of Alaska for predictive, geospatial modeling of marine resources. Loaded by FGDC Metadata Uploader, batch 5224, 12-05-2014 10:42 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) - Lineage (FGDC:lineage) Theme ISO 19115 Topic Category elevation Theme ISO 19115 Topic Category imageryBaseMapsEarthCover Theme ISO 19115 Topic Category oceans Theme Alaska Theme Gulf of Alaska Theme North Pacific Ocean Theme bathymetry Theme point Alaska Fisheries Science Center Seattle WA USA Data Set None Planned digital point data These features were digitized by Mark Zimmermann and Megan Prescott. Funding for much of the work was provided by NOAA's Essential Fish Habitat (EFH), Habitat and Ecological Processes Research (HEPR) through the Alaska NMFS Regional Office. B. McMahon, G. Nelson (retired) and especially C. Barry (Pacific Hydrographic Branch of the NOS) provided assistance with interpreting smooth sheets, bathymetric sounding files, and descriptive reports. D. Doyle and J. Benson provided valuable datum and GIS advice, respectively. D. Fischman, G. Glover, J.A. Bunn, J. Campagnoli, M. Frydrych, and M. Cole from the National Geophysical Data Center helped with accessing smooth sheets on the NGDC web site. N/A N/A N/A Data Steward 2015 Person Zimmermann, Mark mark.zimmermann@noaa.gov Distributor 2015 Organization Alaska Fisheries Science Center AFSC afsc.webmaster@noaa.gov https://ror.org/01h7fye62 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 2014-12-05 Person Zimmermann, Mark mark.zimmermann@noaa.gov Originator 2014-12-05 Person Zimmermann, Mark mark.zimmermann@noaa.gov Point of Contact 2015 Person Zimmermann, Mark mark.zimmermann@noaa.gov observed -154.6 -134.2 60.7 55.8 Range 1901 1999 Unclassified unknown These data are not to be used for navigation. These data are not to be used for navigation. We consider this smooth sheet bathymetry and feature compilation a first draft. These data are not to be used for navigation. https://www.afsc.noaa.gov/RACE/groundfish/bathymetry/CGOA_features.zip https://www.ncei.noaa.gov https://www.afsc.noaa.gov/RACE/groundfish/bathymetry/CGOA_features.zip Online Resource ZIP Microsoft Windows 7 Version 6.1 (Build 7600) ; ESRI ArcGIS 10.0.5.4400 Our editing included deleting erroneous and superseded values, digitizing missing values, and properly aligning all data sets to a common, modern datum. not applicable Our editing included deleting erroneous and superseded values, digitizing missing values, and properly aligning all data sets to a common, modern datum. See also Abstract No Unknown No No Yes Unknown 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. unknown gov.noaa.nmfs.inport:22903 Nancy Roberson 2014-12-05T10:42:20 SysAdmin InPortAdmin 2026-03-04T19:17:17 2016-05-18 Alaska Fisheries Science Center AFSC 7600 Sand Point Way N.E., Building 4 Seattle WA 98115 USA https://www.afsc.noaa.gov 0700-1700 Pacific Time 1001 Public No No 2016-05-18 1 Year 2017-05-18 Point Albers Conical Equal Area 55.0 65.0 -154.0 50.0 0.0 0.0 coordinate pair 0.0000000030536018158500163 0.0000000030536018158500163 meters D North American 1983 GRS 1980 6378137.0 298.257222101 Mean lower low water 0.3 meters Explicit depth coordinate included with horizontal coordinates