Details:

Personal Author:
Zimmermann, M. (Mark) ; Prescott, M. M. ;
Zimmermann, M. (Mark) ; Prescott, M. M. ; Less -
Corporate Authors:
Alaska Fisheries Science Center (U.S.) ;
NOAA Program & Office:
NMFS (National Marine Fisheries Service) ; AFSC (Alaska Fisheries Science Center) ;
NMFS (National Marine Fisheries Service) ; AFSC (Alaska Fisheries Science Center) ; Less -
Description:
"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 Our editing included deleting erroneous and superseded values, digitizing missing values, and properly aligning all data sets to a common, modern datum. There were six areas where these older surveys were superseded by compilations of reduced-resolution multibeam surveys.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."
Content Notes:
by M. Zimmermann and M.M. Prescott. "April 2014." System requirements: Adobe Acrobat Reader. Includes bibliographical references (pages 19-20).
Keywords:
[+]
Bathymetric Maps
Hydrographic Surveying
Multibeam Mapping
Shorelines

Series:
NOAA technical memorandum NMFS-AFSC ; 275;
Document Type:
Technical Memorandum ;
Place as Subject:
Alaska ; Cook Inlet ;
Alaska ; Cook Inlet ; Less -
Rights Information:
Public Domain
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:57b30c89fe5e60f0eb5cf632ed1e4ff97919262d631b8484a84eaec0e0ae640c
File Type:

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