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Metadata Identifier: gov.noaa.ngdc.mgg.dem:657

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 Homer, Alaska 1 arc-second DEM The 1-second Homer Alaska Elevation Grid provides bathymetric data in ASCII raster format of .89-second resolution in geographic coordinates. This grid is strictly for tsunami inundation modeling
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SV_Identification

Count Component Title Type
1 Footprints ArcGIS Map Service Digital Elevation Model Footprints ArcGIS Map Service ArcGIS Map Service
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CI_Citation

Count Component Title Date Citation Identifier
1 1:25000 and 1:63360 hydrographic vectors, 7.5-minute digital raster graphics
  • 1997-01-01
1 Digital Elevation Model Footprints ArcGIS Map Service
  • 2011-02-15
1 GEODAS Vol 2, Ver 4.1 and Global Relief
  • 2002-01-01
1 Homer, Alaska 1 arc-second DEM
  • 2002-01-01
1 Mean High Water height
  • 2012-08-05
1 NASA/GCMD Data Center Keywords
    1 NASA/GCMD Data Resolution Keywords
      1 NASA/GCMD Location Keywords
        1 NASA/GCMD Platform Keywords
          1 NASA/Global Change Master Directory (GCMD) Earth Science Services Keywords NASA/GCMD Services Keywords
            1 None
              1 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 2002
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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 GCMD Valids custodian http://gcmd.nasa.gov/learn/keyword_list.html
                3 DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, Department of Commerce publisher http://ngdc.noaa.gov/mgg/coastal/coastal.html
                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 Varner, Jesse Jesse Varner DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce Jesse.Varner@noaa.gov pointOfContact
                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 GCMD User Support Office NASA GCMD User Support Office gcmduso@gcmd.gsfc.nasa.gov custodian http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso
                1 NOAA National Geophysical Data Center originator
                4 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 USGS National Mapping Division publisher
                1 USGS National Mapping Division originator
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                CI_OnlineResource

                Count Component Linkage Name Description Function
                1 http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso GCMD Feedback Form Have a Comment for the GCMD? information
                1 GCMD Keyword Page http://gcmd.nasa.gov/learn/keyword_list.html GCMD Keywords Page This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions. information
                1 http://gis.ngdc.noaa.gov/arcgis/rest/services/dem_hillshades/ImageServer DEM Color Shaded Relief Image Service An ArcGIS image service showing color shaded relief visualizations of land and seafloor digital elevation models (DEMs) available from NOAA's National Geophysical Data Center. search
                1 http://maps.ngdc.noaa.gov/arcgis/rest/services/web_mercator/dem_extents/MapServer Digital Elevation Model Footprints ArcGIS Dynamic Map Service REST endpoint for Digital Elevation Model Footprints ArcGIS dynamic map service search
                1 http://maps.ngdc.noaa.gov/soap/web_mercator/dem_extents/MapServer/WMSServer?request=GetCapabilities%26service=WMS Digital Elevation Model Footprints Web Map Service (WMS) Capabilities document for Open Geospatial Consortium Web Map Service for Digital Elevation Model Footprints search
                4 http://nctr.pmel.noaa.gov/index.html NOAA Center for Tsunami Research NOAA/PMEL/Center for Tsunami Research (NCTR) information
                1 http://ngdc.noaa.gov/mgg/coastal/coastal.html Integrated Models of Coastal Relief at NGDC Please see NGDC's website for more information about Coastal DEMs at NGDC. information
                1 http://noaa.maps.arcgis.com/home/item.html?id=d41f39c8a6684c54b62c8f1ab731d5ad NOAA GeoPlatform Entry for Digital Elevation Model Footprints NOAA GeoPlatform listing for Digital Elevation Model Footprints ArcGIS Map Service 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 -151.56 -151.37 59.67 59.58
                1 -180 180 90 -90
                1 1890-01-01 2001-01-01
                1 1982-01-01 1982-01-01
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                EX_GeographicBoundingBox

                Count Component West East North South
                1 -151.56 -151.37 59.67 59.58
                1 -180 180 90 -90
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                EX_TemporalExtent

                Count Component Start End
                1
                1 1890-01-01 2001-01-01
                1 1982-01-01 1982-01-01
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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.
                1 NOAA disclaimer While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
                1 These data 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 official navigation products, please refer to the U.S. nautical charts available from the NOAA Office of Coast Survey: http://www.nauticalcharts.noaa.gov.
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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 3 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 339
                1 column 777
                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, 7.5-minute digital raster graphics 1997-01-01 Source Contribution: topographic elevation contours and shoreline; Source Type: online
                1 GEODAS Vol 2, Ver 4.1 and Global Relief 2002-01-01 Source Contribution: bathymetric data values; Source Type: online
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                LE_ProcessStep or LI_ProcessStep

                Count Component DateTime Description
                1 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 marina data, and local photogrammetric data. A TIN (Triangulated Irregular Network) was created using bathymetric data points and coastline points using ArcInfo CREATETIN. A 0.88-second grid was created using TINLATTICE. The data was assessed for quality using ArcView Spatial Analyst. The grid was compared to its raw dataset. The 0.88-second grid was clipped to requested coordinates. 62 analog photogrammetric maps were scanned into TIFF format by the Alaska Tsunami Mapping Team and transferred to the NOAA Center for Tsunami Inundation Mapping Efforts. The TIFF files were georeferenced and 2-foot topographic contours from 38 images covering the Homer region area were digitized. The contours were converted to predetermined vertical datum and units. A TIN was created using the digitized contours, USACE topographic points and contours, USGS DRG 10-meter contours, and coastline using ArcInfo CREATETIN. A 0.88-second topographic grid was created using TINLATTICE and clipped to requested coordinates. The data were assessed for quality using ArcView Spatial Analyst by comparing raw datasets. The topographic grid was updated with the Aeromap U.S. LIDAR data. The LIDAR data grid was analyzed for quality and converted to predetermined projection, datum, and resolution. The LIDAR data was compared to other topographic data sources and then merged with the original grid, superseding earlier data. Consistency between the LIDAR coverage area and older topographic data was verified. The final topographic grid was analyzed for quality. The topographic and bathymetric grids were merged into a single grid and analyzed for quality. 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.
                1 2008-11-04T00:00:00 Metadata imported.
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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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