geosciences Article Bathymetry and Geomorphology of Shelikof Strait and the Western Gulf of Alaska Mark Zimmermann 1,* , Megan M. Prescott 2 and Peter J. Haeussler 3 1 National Marine Fisheries Service, Alaska Fisheries Science Center, National Oceanic and Atmospheric Administration (NOAA), Seattle, WA 98115, USA 2 Lynker Technologies, Under contract to Alaska Fisheries Science Center, Seattle, WA 98115, USA;
[email protected] 3 U.S. Geological Survey, 4210 University Dr., Anchorage, AK 99058, USA;
[email protected] * Correspondence:
[email protected]; Tel.: +1-206-526-4119 Received: 22 May 2019; Accepted: 19 September 2019; Published: 21 September 2019 Abstract: We defined the bathymetry of Shelikof Strait and the western Gulf of Alaska (WGOA) from the edges of the land masses down to about 7000 m deep in the Aleutian Trench. This map was produced by combining soundings from historical National Ocean Service (NOS) smooth sheets (2.7 million soundings); shallow multibeam and LIDAR (light detection and ranging) data sets from the NOS and others (subsampled to 2.6 million soundings); and deep multibeam (subsampled to 3.3 million soundings), single-beam, and underway files from fisheries research cruises (9.1 million soundings). These legacy smooth sheet data, some over a century old, were the best descriptor of much of the shallower and inshore areas, but they are superseded by the newer multibeam and LIDAR, where available. Much of the offshore area is only mapped by non-hydrographic single-beam and underway files. We combined these disparate data sets by proofing them against their source files, where possible, in an attempt to preserve seafloor features for research purposes.