gov.noaa.nmfs.inport:22166 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: Cook Inlet Grid AFSC/RACE/GAP/Zimmermann: Cook Inlet Grid 2014-04 publication NOAA/NMFS/EDM 22166 https://www.fisheries.noaa.gov/inport/item/22166 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/Cook_bathymetry_grid.zip WWW:LINK-1.0-http--link Citation URL Online Resource download mapDigital We assembled 1.4 million National Ocean Service (NOS) bathymetric soundings from 98 lead-line and single-beam echosounder hydrographic surveys conducted from 1910 to 1999 in Cook Inlet, 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 Our editing included deleting erroneous and superseded values, digitizing missing values, and properly aligning all data sets to a common, modern datum. There were six areas where these older surveys were superseded by compilations of reduced-resolution multibeam surveys. We digitized 12,000 features, such as rocky reefs, kelp beds, rocks and islets, adding them to what was originally available, and creating the most thorough source (n = 18,000) of these typically shallow, inshore features. We also digitized 2,418 km of the mainland and 529 km of island shoreline, generally at a resolution of 1:20,000, and digitized 9,271 verbal surficial sediment descriptions from the smooth sheets. The depth surface, shoreline, inshore features, and sediment data sets are mostly produced at a scale of 1:20,000. The purpose for creating this data set was to provide the best available bathymetry, surficial sediments, shoreline and inshore features of Cook Inlet for predictive, geospatial modeling of marine resources. These bathymetry data were proofed, edited and 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. completed Zimmermann, Mark mark.zimmermann@noaa.gov pointOfContact Zimmermann, Mark mark.zimmermann@noaa.gov custodian notPlanned Alaska Cook Inlet North Pacific Ocean bathymetry grid 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: Cook Inlet Grid [Data Date Range], https://www.fisheries.noaa.gov/inport/item/22166. 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. 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. We consider this smooth sheet bathymetry, feature, shoreline and sediment compilation a fairly complete first draft. This project was small enough, and we had enough time, to work on all four of these interrelated smooth sheet elements, unlike our Aleutian Islands compilation where our efforts were limited to smooth sheet bathymetry and sediments. Additionally we were able to supersede some areas with more modern and detailed multibeam data, something we could not do in the Aleutians. Due to the uncharacteristically thorough and modern coverage of these smooth sheets, we felt confident in producing a 50 m resolution grid for Cook Inlet, offering four times as much detail as our 100 m Aleutians grid. unclassified NOAA Data Management Plan (DMP) NOAA/NMFS/EDM 22166 https://www.fisheries.noaa.gov/inportserve/waf/noaa/nmfs/afsc/dmp/pdf/22166.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 elevation imageryBaseMapsEarthCover oceans Microsoft Windows 7 Version 6.1 (Build 7600) ; ESRI ArcGIS 10.0.5.4400 -154.3 -148.9 58.8 61.6 The 20,540 km2 of Cook Inlet, including Kamishak Bay, Kachemak Bay, Knik Arm and Turnagain Arm. | Currentness: observed 1910 2009 This bathymetry grid was created in several steps. First, the bathymetry point data and inshore smooth sheet features, such as rocks and islets, were compared to the source documents - the smooth sheets - and corrected or digitized. Second, the shoreline, which is defined as MHW (Mean High Water tidal datum) was digitized. Third, in six small areas, multibeam data was subsetted at a resolution of 50 m and substituted for the older, less-detailed smooth sheet data. Fourth, the bathymetry point data, which included bathymetric soundings, inshore features with depths or elevations, the MHW shoreline and reduced-resolution multibeam data, were used to create a Triangulated Irregular Network (TIN). The TIN was converted into a grid (raster with 50 meter square pixels). Finally, the grid was trimmed by the shoreline to cover the spatial extent of the study area. 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/Cook_bathymetry_grid.zip WWW:LINK-1.0-http--link https://www.afsc.noaa.gov/RACE/groundfish/bathymetry/Cook_bathymetry_grid.zip download dataset Completeness Report Our editing included deleting erroneous and superseded values, digitizing missing values, and properly aligning all data sets to a common, modern datum. Conceptual Consistency not applicable unknown otherRestrictions Use Constraints: These data are not to be used for navigation.