gov.noaa.nmfs.inport:22165 eng UTF8 dataset Alaska Fisheries Science Center 7600 Sand Point Way N.E., Building 4 Seattle WA 98115 USA https://www.afsc.noaa.gov WWW:LINK-1.0-http--link Website Website for this organization information 0700-1700 Pacific Time resourceProvider Zimmermann, Mark mark.zimmermann@noaa.gov pointOfContact 2026-03-04T19:17:17 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) AFSC/RACE/GAP/Zimmermann: Aleutians Sediments AFSC/RACE/GAP/Zimmermann: Aleutians Sediments 2013-05 publication NOAA/NMFS/EDM 22165 https://www.fisheries.noaa.gov/inport/item/22165 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information Zimmermann, Mark mark.zimmermann@noaa.gov originator https://www.afsc.noaa.gov/RACE/groundfish/bathymetry/AI_sediments.zip WWW:LINK-1.0-http--link Citation URL Online Resource download We assembled 2.1 million National Ocean Service (NOS) bathymetric soundings extending 1,900 km along the Aleutian Islands from Unimak Island in the east to the Russian border in the west, and ranging approximately 500 km north of the central Aleutians to Petrel and Bowers Banks, and also the surrounding deep waters of the southeastern Bering Sea. 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 Our editing included deleting erroneous and superseded values, digitizing missing values, and properly aligning all data sets to a common, modern datum. We also digitized 25,000 verbal surficial sediment descriptions from the smooth sheets, providing the largest single source of sediment information for the Aleutians. The purpose for creating this data set was to provide the best available sediment information of the Aleutian Islands for predictive, geospatial modeling of sponge and coral abundance and diversity. These sediment data were digitized by Megan Prescott. Funding for much of the work was provided by NOAA's Deep Sea Coral and Sponge Initiative, through a project led by Chris Rooper. 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. completed Zimmermann, Mark mark.zimmermann@noaa.gov pointOfContact Zimmermann, Mark mark.zimmermann@noaa.gov custodian notPlanned Alaska Aleutian Islands North Pacific Ocean point sediment theme DOC/NOAA/NMFS/AFSC > Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2017-04-24 publication 8.5 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Groundfish Assessment Program project InPort otherRestrictions Cite As: Alaska Fisheries Science Center, [Date of Access]: AFSC/RACE/GAP/Zimmermann: Aleutians Sediments [Data Date Range], https://www.fisheries.noaa.gov/inport/item/22165. NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose. otherRestrictions Access Constraints: These data are not to be used for navigation. otherRestrictions Use Constraints: These data are not to be used for navigation.We consider this smooth sheet bathymetry and sediment compilation a first draft. Time did not allow for careful editing along shore where some bathymetric features such as rocks, islets and rocky reefs sometimes have depths (or elevations) associated with them. Digitization of kelp patches and comments about tide rips or strong currents also was not completed. Shorelines, defined as Mean High Water (MHW) tidal datum, could also be digitized, connecting the seafloor bathymetry with land topography and satellite imagery. Additionally, soundings from smaller scale surveys could be deleted in areas where they overlap soundings from larger scale surveys, in order to remove possible contradictions. As more bathymetry data becomes available, and as more time allows, additional bathymetry drafts will be completed.Our slow method of data editing and compilation, which relied on comparing the digitized soundings to the smooth sheets in a GIS, was vindicated by the discovery and elimination of numerous errors, such as incorrect, misplaced and missing soundings. Properly accounting for the horizontal shift from the original datum to NAD 1983 HARN was the most important part of our error-checking.There is a significant gap in hydrographic survey data in the central Aleutians surrounding part of Atka Island, most of Amlia Island, and western Seguam Pass.There is very little spatial coverage of multibeam hydrographic survey data for the Aleutian Islands, totaling only about 3% of the study area. The largest single source is from a 2005 backarc mapping cruise on the RV Thompson, which mapped approximately 9,700 km2, at nine sites, scattered through the central and western Aleutians, mostly in deeper water (Coombs et al. 2007). The second largest data set of approximately 8,900 km2is from the northeastern edge of Bowers Bank (Gardner 2003), from the U.S. Extended Continental Shelf Task Force (USECSTF), under the auspices of the United Nations Convention on the Law of the Sea (UNCLOS). Another substantial multibeam data set of 5,100 km2is from NOS which is currently mapping shallower areas of navigational importance in the Unimak Pass, Akutan Pass and Unalga Pass areas. There are 20 surveys presently available with more being completed annually, but only in the eastern Aleutians. A mapping transect from the Revellecovers about 3,400 km2in the eastern Aleutians. Another mapping effort of 2,700 km2was a cold-water corals research project funded by NPRB (North Pacific Research Board), on the RV Davidson, in 2003, which mapped 17 sites in narrow strips ranging from shallow to deep. There are other, isolated, small multibeam maps such as that covering about 59 km2by CRESP (Consortium for Risk Evaluation with Stakeholder Participation; Johnson and Stewart 2005) at Amchitka Island. unclassified NOAA Data Management Plan (DMP) NOAA/NMFS/EDM 22165 https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/22165.pdf WWW:LINK-1.0-http--link NOAA Data Management Plan (DMP) NOAA Data Management Plan for this record on InPort. information crossReference eng; US geoscientificInformation imageryBaseMapsEarthCover oceans Microsoft Windows 7 Version 6.1 (Build 7600) ; ESRI ArcGIS 10.0.5.4400 172 -162.5 51 56 1,900 km along the Aleutian Islands from Unimak Island in the east to the Russian border in the west, and ranging approximately 500 km north of the central Aleutians to Petrel and Bowers Banks, and also the surrounding deep waters of the southeastern Bering Sea. | Currentness: observed 1934 1993 Alaska Fisheries Science Center (206) 526-4000 (206) 526-4004 7600 Sand Point Way N.E., Building 4 Seattle WA 98115 USA afsc.webmaster@noaa.gov https://www.fisheries.noaa.gov/about/alaska-fisheries-science-center WWW:LINK-1.0-http--link Alaska Fisheries Science Center Website AKFSC Home Page information 0700-1700 Pacific Time distributor https://www.ncei.noaa.gov WWW:LINK-1.0-http--link https://www.ncei.noaa.gov download https://www.afsc.noaa.gov/RACE/groundfish/bathymetry/AI_sediments.zip WWW:LINK-1.0-http--link https://www.afsc.noaa.gov/RACE/groundfish/bathymetry/AI_sediments.zip download dataset Completeness Report We digitized this data set from smooth sheets aligned to a common, modern datum (NAD 1983 HARN). Conceptual Consistency not applicable unknown otherRestrictions Use Constraints: These data are not to be used for navigation.