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Metadata Identifier: gov.noaa.ngdc.mgg.dem:645

Aggregation Info | Bands | Citations | Constraints | Coverage Descriptions | Dimensions | Extents | Formats | Geographic Bounding Box
Georectified Information | Georeferenceable Information | Identifiers | Instruments | Mediums | OnlineResources | Operations
Platforms | Process Steps | Range Elements | Reference Systems | Responsible Parties | Series | Sources | Spatial Grids | Temporal Extents

MD_DataIdentification

Count Component Title Abstract
1 2 minute Southcentral Alaska Elevation Grid The 2-minute Southcentral Alaska Elevation Grid provides bathymetric data in ASCII raster format of 2-minute resolution in geographic coordinates. This grid is strictly for tsunami inundation modeling
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SV_Identification

none found
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CI_Citation

Count Component Title Date Citation Identifier
1 1:25000 and 1:63360 hydrographic vectors
1 2 minute Southcentral Alaska Elevation Grid
  • 2004-06-23
1 Bathymetric Condition Survey
  • 2001-01-01
1 Electronic Nautical Charts
  • 2002-01-01
1 GEODAS Vol 2, Ver 4.2 and Global Relief
  • 2004-01-01
1 Homer, Seldovia, and Seward Hydrographic Surveys
  • 2002-01-01
1 Mean High Water height
  • 2012-08-05
1 Multibeam surveys for Seward OPR-P359-RA-01
  • 2001-01-01
1 NASA/GCMD Data Center Keywords
    1 NASA/GCMD Data Resolution Keywords
      1 NASA/GCMD Location Keywords
        1 NASA/GCMD Platform Keywords
          1 None
            2 Uncontrolled
              1 World Geodetic System 1984
              • 2007-08-27
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              CI_Series

              Count Component Name Issue Identification Page
              1 Alaska Grids Southcentral Alaska 2004
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              CI_ResponsibleParty

              Count Component Individual Organization Position Email Role Linkage
              2 resourceProvider http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4326
              1 Alaska Railroad Corporation publisher
              1 Alaska Railroad Corporation originator
              2 DEM Info DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce DEM Information dem.info@noaa.gov pointOfContact
              2 EPSG Registry European Petroleum Survey Group publisher http://www.epsg-registry.org/
              1 Kelly Carignan Kelly Carignan DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce kelly.carignan@noaa.gov pointOfContact
              1 NOAA NOS Office of Coast Survey publisher
              1 NOAA NOS Office of Coast Survey, Pacific Hydrographic Branch publisher
              1 NOAA National Geophysical Data Center originator
              2 NOAA National Ocean Service, Office of Coast Survey originator
              3 publisher - NOAA/PMEL/Center for Tsunami Research (NCTR) NOAA/PMEL/Center for Tsunami Research (NCTR) NOAA Center for Tsunami Research oar.pmel.time-support@noaa.gov publisher http://nctr.pmel.noaa.gov/index.html
              1 U.S Army Corps of Engineers Alaska District originator
              1 USACE Alaska District publisher
              1 USGS National Mapping Division publisher
              1 USGS National Mapping Division originator
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              CI_OnlineResource

              Count Component Linkage Name Description Function
              3 http://nctr.pmel.noaa.gov/index.html NOAA Center for Tsunami Research NOAA/PMEL/Center for Tsunami Research (NCTR) information
              2 http://www.epsg-registry.org/ European Petroleum Survey Group Geodetic Parameter Registry Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations. search
              1 http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4326 WGS 84 GML of World Geodetic System 1984 coordinate reference system. information
              1 http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:datum:EPSG::5868 MHW height GML for Mean High Water height available at the epsg-registry. information
              1 DEM map search http://www.ngdc.noaa.gov/dem/squareCellGrid/map Map Interface Graphic geo-spatial search tool for locating completed and planned DEMs. search
              1 DEM text search http://www.ngdc.noaa.gov/dem/squareCellGrid/search DEM text search tool Text search tool for locating completed and planned DEMs. search
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              MD_Identifier or RS_Identifier

              Count Component Code
              1 urn:ogc:def:crs:EPSG::4326
              1 urn:ogc:def:datum:EPSG::5868
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              EX_Extent

              Bounding Box Temporal Extent
              Count Component Description West East North South Start End
              1 -169.00 -140.00 62.00 52.00
              1 1890-01-01 2001-01-01
              1 2001-01-01 2003-01-01
              2
              1
              1 2000-01-01 2002-01-01
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              EX_GeographicBoundingBox

              Count Component West East North South
              1 -169.00 -140.00 62.00 52.00
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              EX_TemporalExtent

              Count Component Start End
              1 1890-01-01 2001-01-01
              1 2001-01-01 2003-01-01
              3
              1 2000-01-01 2002-01-01
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              MD_Format

              Count Component Name Version specification
              1 ESRI Arc ASCII 1 ASCII text version of ESRI ArcGIS raster format
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              MD_Medium

              none found
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              MD_Constraints

              Count Component Use Limitation
              1 not for navigation Not to be used for navigation. Although these data are of high quality and useful for planning and modeling purposes, they are not suitable for navigation. For navigation, please refer to the NOS nautical chart series.
              1 copyright statement Produced by the NOAA National Geophysical Data Center. Not subject to copyright protection within the United States.
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              MD_ReferenceSystem

              Count Component Code Authority Title
              1 WGS84 urn:ogc:def:crs:EPSG::4326 World Geodetic System 1984
              1 Mean High Water height urn:ogc:def:datum:EPSG::5868 Mean High Water height
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              MD_GridSpatialRepresentation

              Count Component Number of Dimensions Cell Geometry Code
              1 2 area
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              MD_Georeferenceable or MI_Georeferenceable

              none found
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              MD_Georectified or MI_Georectified

              none found
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              MD_Dimension

              Count Component Name Code Size
              1 row 300
              1 column 870
              1 vertical 1
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              MD_CoverageDescription or MI_CoverageDescription

              none found
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              MD_Band or MI_Band

              none found
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              MI_RangeElementDescription

              none found
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              MD_AggregateInformation

              none found
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              LE_Source or LI_Source

              Count Component Title Date Description
              1 1:25000 and 1:63360 hydrographic vectors Source Contribution: shoreline, mean high water line; Source Type: online
              1 Bathymetric Condition Survey 2001-01-01 Source Contribution: bathymetric and coastline data values; Source Type: CD-ROM
              1 Electronic Nautical Charts 2002-01-01 Source Contribution: bathymetric data values; Source Type: online
              1 GEODAS Vol 2, Ver 4.2 and Global Relief 2004-01-01 Source Contribution: bathymetric data values; Source Type: online
              1 Homer, Seldovia, and Seward Hydrographic Surveys 2002-01-01 Source Contribution: bathymetric and coastline data values; Source Type: online
              1 Multibeam surveys for Seward OPR-P359-RA-01 2001-01-01 Source Contribution: bathymetric data values; Source Type: CD-ROM
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              LE_ProcessStep or LI_ProcessStep

              Count Component DateTime Description
              1 2004-06-01T00:00:00 Each raw data source was converted into ESRI ArcGIS formats. The resulting files were converted and adjusted to predetermined projection (geographic), horizontal datum (NAD27), and vertical datum (MHW) using the ArcInfo PROJECT command and ArcView Spatial Analyst MAP CALCULATOR algorithm. A polyline shapefile was created to represent the coastline. The coastline is a culmination of USGS hydrographic vectors, USACE coastline, and AKRR coastline vectors. A TIN (Triangulated Irregular Network) was created using bathymetric data point and coastline points using ArcInfo CREATETIN. An 8-second grid was created using TINLATTICE. A 2-minute grid was created using Smith and Sandwell data to fill in remaining gaps. Smith and Sandwell data was compared with denser data to ensure continuity. The data was assessed for quality using ArcView Spatial Analyst. The grid was compared to its raw dataset. The 8-second grid was resampled to 2 minutes and merged with the Smith and Sandwell data. The grid was updated with recent datasets surrounding Homer-Seldovia, Kodiak, and Seward. New data was incorporated into the grids by creating new TINs for the regional area. Data were assessed for quality by comparing with original sources, corresponding sources, and control data. Continuity between old and new data were assessed and errors were corrected. The final grid was analyzed for blunders, systematic errors, and logical consistency.
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              MI_Operation

              none found
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              MI_Platform

              none found
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              MI_Instrument

              none found
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