AFSC/RACE/GAP/Prescott: Central Gulf of Alaska Multibeam Survey H11114

We assembled 1.75 million National Ocean Service (NOS) bathymetric soundings from 225 lead-line and single-beam echosounder hydrographic surveys conducted from 1901 to 1999 in the central Gulf of 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. There were several areas where these older surveys were superseded by more recent, higher quality multibeam surveys, mostly from the NOS (n=106). Three of these were unprocessed NOS multibeam surveys in the Sitka area, which we edited and processed into final bathymetric surfaces. We reduced the resolution of these multibeam surveys to 100 m, since some may have sub-meter resolution and many exceed a million soundings, and added them to our bathymetry compilation.

In Sitka Sound was missing survey H11114. Processing and adding its bathymetric data to our compilation filled in a substantial gap in Sitka area, between Kruzof and Krestof islands.

The purpose for creating this coverage was to fill in gaps with previously unprocessed multibeam data set, that were missing in the central Gulf of Alaska data set. Combined with other bathymetric data in the region this work is useful for predictive, geospatial modeling of marine resources.

Loaded by FGDC Metadata Uploader, batch 5279, 01-06-2015 13:38

The following FGDC sections are not currently supported in InPort, but were preserved and will be included in the FGDC export:

- Spatial Reference Information (FGDC:spref),

- Spatial Data Organization Information (FGDC:spdoinfo)

- Lineage (FGDC:lineage)

unknown

These data are not to be used for navigation.

These data are not to be used for navigation. We consider this bathymetry compilation a fairly complete first draft and sufficient in quality for addition to the central Gulf of Alaska bathymetry compilation.

These data are not to be used for navigation.

Microsoft Windows 7 Version 6.1 (Build 7600) ; ESRI ArcGIS 10.0.0 ; CARIS HIPS and SIPS 7.1

Processing followed guidelines laid out by NGDC in the Data Aquisition and Processing Report (http://surveys.ngdc.noaa.gov/mgg/NOS/DAPRs/OPR-O112-RA-04_DAPR.pdf), in order to provide comparable work. It was carried out in Caris Hips and Sips 7.1 then exported into ArcGIS 10.0.0, to be added to our additional smooth sheet and multibeam data.

not applicable

See Abstract

No delay

IT Security and Contingency Plan for the system establishes procedures and applies to the functions, operations, and resources necessary to recover and restore data as hosted in the Western Regional Support Center in Seattle, Washington, following a disruption.

unknown