Danielson, Seth Johnson, Mark 20080929 1.03 digital grid AOOS Bathymetric DEM citation: Danielson, S., M. Johnson, S. Solomon & W. Perrie, 1 km Gridded Bathymetric Dataset Based on Ship Soundings: A research tool for the waters of eastern Russia, Alaska & western Canada, 2008, Poster presentation at the 2008 Alaska Marine Science Symposium, Anchorage, Alaska. GLOBE DEM citation: GLOBE Task Team and others (Hastings, David A., Paula K. Dunbar, Gerald M. Elphingstone, Mark Bootz, Hiroshi Murakami, Hiroshi Maruyama, Hiroshi Masaharu, Peter Holland, John Payne, Nevin A. Bryant, Thomas L. Logan, J.-P. Muller, Gunter Schreier, and John S. MacDonald), eds., 1999. The Global Land One-kilometer Base Elevation (GLOBE) Digital Elevation Model, Version 1.0. National Oceanic and Atmospheric Administration, National Geophysical Data Center, 325 Broadway, Boulder, Colorado 80303, U.S.A. Digital data base on the World Wide Web (URL: http://www.ngdc.noaa.gov/mgg/topo/globe.html) and CD-ROMs. http://ak.aoos.org/rest/metadata/AOOS/AOOSDEM We have created a digital elevation model (DEM) with nominal 1-km grid spacing over the domain 45ºN-75ºN and 130ºE-120ºW. The AOOS Bathymetric DEM is based solely on sounding datapoints from a diverse set of sources, including Electronic Navigation Chart (ENC) point soundings, research vessel underway soundings, multibeam swath mapping datasets and digitized point soundings from paper nautical charts. This product is in partial fulfillment of the Alaska Ocean Observing System's goal of improving the safety and efficiency of marine operations. 20080902 publication date In work As needed Alaska coastal and surrounding bodies of water. Arctic and Pacific Oceans. -60.00000 130.00000 75.00000 45.00000 IOOS Core Variables Version 1 Bathymetry Core Variable Map Bathymetry:z AOOS Data Services dsid=AOOSDEM data=http://penguin.sfos.uaf.edu/rest/datasets/dsid=AOOSDEM short_title=AOOS DEM metadata=AOOS/AOOSDEM Variable Map z:z:depth:meters IOOS National Backbone Programs Version 1 Alaska Ocean Observing System (AOOS) None This DEM is freely available and distributable but may not be repackaged for commercial purposes. USE THIS DEM AT YOUR OWN RISK. This product is not for navigational purposes. This is a research-grade product in development and we expect that there are regions that do not well reflect actual bathymetry and topography. In order to assist those who have interest in employing a combined bathymetric-topographic DEM, we have spliced the ocean DEM grid with land elevations from the Global Land One-kilometer Base Elevation (GLOBE) 1-km open source DEM. Because the GLOBE DEM is based on a pixel registration grid, we have employed a bilinear interpolation to re-register to gridline nodes. Please see the GLOBE web site for detailed documentation, use policies and copyright information: http://www.ngdc.noaa.gov/mgg/topo/globe.html Seth Danielson Institute of Marine Science Research Project Manager mailing

University of Alaska Fairbanks

Suite 245 O'Neill Bldg

Fairbanks Alaska 99775 (907) 474-7834 seth@ims.uaf.edu Information was gridded as is without additional corrections applied. Gridded soundings are from multiple geoids: WGS84, NAD27, and NAD84. All known soundings to date have been incorprated into this product. This does not include any gridded data or bathymetric contour information. Only raw soundings were used in generation of this product. Lab Example gridding steps applied to raw soundings: blockmedian data.dat -R130/240/45/75 -I60c/30c -C -V > soundings.xyz; surface soundings.xyz -R130/240/45/75 -I60c/30c -T.35 -V -Gsoundings.grd. Additional steps are employed for error-checking and splicing the soundings grid with the land elevations grid. Version 1.01: Initial release. 20080902 Seth Danielson mailing Fairbanks Alaska 99775 (907) 474-7834 Version 1.02: Fixed an interpolation problem between land and ocean (coastal) areas. 20080905 Seth Danielson mailing Fairbanks Alaska 99775 (907) 474-7834 Version 1.03: Additonal soundings from a) Chart 10682; b) soundings from misc.2008 cruises in the Beaufort Sea; c) Additional high-resolution soundings from Bowers Ridge and NE Gulf of Alaska. Additional error checking to all datapoints. 20080930 Latitude Resolution: 60 sec Longitude Resolition: 30 sec SpatialRef: PROJCS["unnamed", GEOGCS["unnamed ellipse", DATUM["unknown", SPHEROID["unnamed",6371005.076123,0]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433]], PROJECTION["Equirectangular"], PARAMETER["latitude_of_origin",50], PARAMETER["central_meridian",180], PARAMETER["false_easting",0], PARAMETER["false_northing",0], UNIT["Meter",1]] GeoTransform: GeoTransform=-3574334.5259 1191.24630091 0 5003312.27425 0 926.82307548 unknown World Geodetic System of 1984 6371005.076123 infinite AOOSbathymetricDEM File may be GMT (.gmt) or NetCDF (.nc). Both are NetCDF formats. Alaska Ocean Observing System lon Longitude from 0 to 360 (0 - 180 E; 180 - 360 W) Alaska Ocean Observing System 130.0 240.0 degrees lat Latitude (+ E; - W) Alaska Ocean Observing System 45.0 75.0 degrees z Depth Alaska Ocean Observing System -9781.7050781250000 5965.2226562500000 meters 20080930 Alaska Ocean Observing System Rob Cermak Data Manager mailing and physical

Suite 245 O'Neill Building

905 N. Koyukuk Dr

Fairbanks Alaska 99709 (907) 474-7948 cermak@sfos.uaf.edu Email preferred. FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999 None None