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Port Alexander, Alaska 8/45 arc-second Coastal Digital Elevation Model


 (MI_Metadata)
    fileIdentifier:  gov.noaa.ngdc.mgg.dem:portalexander_ak_845_mhhw
    language:  eng; USA
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        organisationName:  NOAA National Centers for Environmental Information
        positionName:  DEM Information
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            address:  (CI_Address)
                electronicMailAddress:  dem.info@noaa.gov
        role:  (CI_RoleCode) pointOfContact
    dateStamp:  2022-12-27
    metadataStandardName:  ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
    metadataStandardVersion:  ISO 19115-2:2009(E)
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                title:  World Geodetic System 1984
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                title:  Mean Higher High Water height
                alternateTitle:  MHHW height
                date:  (CI_Date)
                    date:  2012-08-05
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            code:  MHHW
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    identificationInfo:  (MD_DataIdentification)
        citation:  (CI_Citation)
            title:  Port Alexander, Alaska 8/45 arc-second Coastal Digital Elevation Model
            date:  (CI_Date)
                date:  2018-11-19
                dateType:  (CI_DateTypeCode) publication
            edition:  First
            citedResponsibleParty:  (CI_ResponsibleParty)
                organisationName:  NOAA National Centers for Environmental Information
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                organisationName:  NOAA National Centers for Environmental Information
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                organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
                role:  (CI_RoleCode) originator
            citedResponsibleParty:  (CI_ResponsibleParty)
                organisationName:  National Tsunami Hazard Mitigation Program (NTHMP)
                role:  (CI_RoleCode) originator
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                positionName:  Citation URL
                contactInfo:  (CI_Contact)
                    onlineResource:  (CI_OnlineResource)
                        linkage: https://www.ngdc.noaa.gov/mgg/coastal/coastal.html
                        protocol:  https:
                        name:  Integrated Models of Coastal Relief
                        description:  Project web page.
                        function:  (CI_OnLineFunctionCode) information
                role: (inapplicable)
            presentationForm:  (CI_PresentationFormCode) mapDigital
            series:  (CI_Series)
                name:  NTHMP DEMs
                issueIdentification:  Port Alexander, Alaska 8/15 arc-second
        abstract:  NOAA's National Centers for Environmental Information (NCEI) is building high-resolution digital elevation models (DEMs) to support individual coastal States as part of the National Tsunami Hazard Mitigation Program's (NTHMP) efforts to improve community preparedness and hazard mitigation. These integrated bathymetric-topographic DEMs are used to support tsunami and coastal inundation mapping. Bathymetric, topographic, and shoreline data used in DEM compilation are obtained from various sources, including NGDC, the U.S. National Ocean Service (NOS), the U.S. Geological Survey (USGS), the U.S. Army Corps of Engineers (USACE), the Federal Emergency Management Agency (FEMA), and other federal, state, and local government agencies, academic institutions, and private companies. DEMs are referenced to various vertical and horizontal datums depending on the specific modeling requirements of each State. For specific datum information on each DEM, refer to the appropriate DEM documentation. Cell sizes also vary depending on the specification required by modelers in each State, but typically range from 8/15 arc-second (~16 meters) to 8 arc-seconds (~240 meters).
        purpose:  Developed for the University of Alaska at Fairbanks (UAF), Geophysical Institute for tsunami and coastal inundation modeling efforts for the State of Alaska.
        status:  (MD_ProgressCode) completed
        pointOfContact:  (CI_ResponsibleParty)
            organisationName:  NOAA National Centers for Environmental Information
            positionName:  DEM Information
            contactInfo:  (CI_Contact)
                address:  (CI_Address)
                    electronicMailAddress:  dem.info@noaa.gov
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            maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) asNeeded
        descriptiveKeywords:  (MD_Keywords)
            keyword:  Earth Science > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
            keyword:  Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry
            keyword:  Earth Science > Oceans > Bathymetry/Seafloor Topography > Water Depth
            keyword:  Earth Science > Land Surface > Topography > Terrain Elevation
            keyword:  Earth Science > Land Surface > Topography > Topographical Relief Maps
            keyword:  Earth Science > Oceans > Coastal Processes > Coastal Elevation
            type:  (MD_KeywordTypeCode) theme
            thesaurusName:  (CI_Citation)
                title:  NASA/GCMD Earth Science Keywords
                date: (unknown)
        descriptiveKeywords:  (MD_Keywords)
            keyword:  DEM > Digital Elevation Model
            type:  (MD_KeywordTypeCode) theme
            thesaurusName:  (CI_Citation)
                title:  NASA/GCMD Platform Keywords
                date: (unknown)
        descriptiveKeywords:  (MD_Keywords)
            keyword:  ICSU-WDS > International Council for Science - World Data System
            type:  (MD_KeywordTypeCode) project
            thesaurusName:  (CI_Citation)
                title:  Global Change Master Directory (GCMD) Project Keywords
                date:  (CI_Date)
                    date:  2020-01-09
                    dateType:  (CI_DateTypeCode) publication
                edition:  9.1
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  NASA Goddard Space Flight Center, Earth Science Data and Information System
                    contactInfo:  (CI_Contact)
                        onlineResource:  (CI_OnlineResource)
                            linkage: https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
                            name:  Global Change Master Directory (GCMD) Keywords
                            description:  The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
                            function:  (CI_OnLineFunctionCode) information
                    role:  (CI_RoleCode) custodian
        descriptiveKeywords:  (MD_Keywords)
            keyword:  H: 1 meter - < 30 meters
            keyword:  V: < 1 meter
            type:  (MD_KeywordTypeCode) theme
            thesaurusName:  (CI_Citation)
                title:  NASA/GCMD Data Resolution Keywords
                date: (unknown)
        descriptiveKeywords:  (MD_Keywords)
            keyword:  Coastal Relief
            keyword:  Gridded elevations
            keyword:  Integrated bathymetry and topography
            type:  (MD_KeywordTypeCode) theme
            thesaurusName:  (CI_Citation)
                title:  Uncontrolled
                date: (unknown)
        descriptiveKeywords:  (MD_Keywords)
            keyword:  Continent > North America > United States of America > Alaska
            keyword:  Ocean > Pacific Ocean > North Pacific Ocean
            keyword:  Vertical Location > Land Surface
            keyword:  Vertical Location > Sea Floor
            type:  (MD_KeywordTypeCode) place
            thesaurusName:  (CI_Citation)
                title:  NASA/GCMD Location Keywords
                date: (unknown)
        descriptiveKeywords:  (MD_Keywords)
            keyword:  Port Alexander
            keyword:  Baranof Island
            keyword:  Cape Ommaney
            keyword:  Alaska
            type:  (MD_KeywordTypeCode) place
            thesaurusName:  (CI_Citation)
                title:  North Pacific
                date: (unknown)
        descriptiveKeywords:  (MD_Keywords)
            keyword:  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
            keyword:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
            type:  (MD_KeywordTypeCode) dataCentre
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                title:  Global Change Master Directory (GCMD) Data Center Keywords
                date:  (CI_Date)
                    date:  2020-01-09
                    dateType:  (CI_DateTypeCode) publication
                edition:  9.1
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  NASA Goddard Space Flight Center, Earth Science Data and Information System
                    contactInfo:  (CI_Contact)
                        onlineResource:  (CI_OnlineResource)
                            linkage: https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
                            name:  Global Change Master Directory (GCMD) Keywords
                            description:  The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
                            function:  (CI_OnLineFunctionCode) information
                    role:  (CI_RoleCode) custodian
        resourceConstraints:  (MD_Constraints)
            useLimitation:  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.
        resourceConstraints:  (MD_Constraints)
            useLimitation:  Produced by the NOAA National Centers for Environmental Information. Not subject to copyright protection within the United States.
        resourceConstraints:  (MD_LegalConstraints)
            accessConstraints:  (MD_RestrictionCode) otherRestrictions
            otherConstraints:  Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
        aggregationInfo:  (MD_AggregateInformation)
            aggregateDataSetName:  (CI_Citation)
                title:  NTHMP DEM Project
                date:  (CI_Date)
                    date:  2009-12-01
                    dateType:  (CI_DateTypeCode) publication
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
                    contactInfo:  (CI_Contact)
                        address:  (CI_Address)
                            city:  Boulder
                            administrativeArea:  Colorado
                    role:  (CI_RoleCode) publisher
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
                    role:  (CI_RoleCode) originator
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                    positionName:  Citation URL
                    contactInfo:  (CI_Contact)
                        onlineResource:  (CI_OnlineResource)
                            linkage: https://www.ncei.noaa.gov/maps/bathymetry/
                            protocol:  HTTPS
                            name:  Bathymetric Data Viewer
                            description:  The Bathymetric Data Viewer is an interactive map providing discovery, descriptions, and download capability for bathymetric survey data and digital elevation models archived at NOAA's National Centers for Environmental Information (NCEI).
                            function:  (CI_OnLineFunctionCode) search
                    role: (inapplicable)
                citedResponsibleParty:  (CI_ResponsibleParty)
                    positionName:  Citation URL
                    contactInfo:  (CI_Contact)
                        onlineResource:  (CI_OnlineResource)
                            linkage: http://www.ngdc.noaa.gov/mgg/inundation/nthmp/nthmp.html
                            name:  NTHMP DEM Project
                            description:  Project web page.
                            function:  (CI_OnLineFunctionCode) information
                    role: (inapplicable)
                presentationForm:  (CI_PresentationFormCode) mapDigital
                series:  (CI_Series)
                    name:  NTHMP DEMs
                    issueIdentification:  Named by primary coastal city, state in DEM.
            associationType:  (DS_AssociationTypeCode) largerWorkCitation
        aggregationInfo:  (MD_AggregateInformation)
            aggregateDataSetName:  (CI_Citation)
                title:  Digital Elevation Models of Port Alexander and Wrangell, Alaska: Procedures, Data Sources and Analysis
                date:  (CI_Date)
                    date:  2017-02-08
                    dateType:  (CI_DateTypeCode) publication
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
                    contactInfo:  (CI_Contact)
                        address:  (CI_Address)
                            city:  Boulder
                            administrativeArea:  CO
                    role:  (CI_RoleCode) publisher
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  Kelly S. Carignan
                    role:  (CI_RoleCode) originator
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  Matthew R. Love
                    role:  (CI_RoleCode) originator
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  Michael Sutherland
                    role:  (CI_RoleCode) originator
                citedResponsibleParty:  (CI_ResponsibleParty)
                    organisationName:  Christopher Amante
                    role:  (CI_RoleCode) originator
                citedResponsibleParty:  (CI_ResponsibleParty)
                    positionName:  Citation URL
                    contactInfo:  (CI_Contact)
                        onlineResource:  (CI_OnlineResource)
                            linkage: https://www.ngdc.noaa.gov/mgg/dat/dems/regional_tr/
                            name:  Digital Elevation Models of Port Alexander and Wrangell, Alaska: Procedures, Data Sources and Analysis
                            description:  Report describing the development of the Port Alexander and Wrangell, Alaska DEMs
                            function:  (CI_OnLineFunctionCode) download
                    role: (inapplicable)
                otherCitationDetails:  5 pages
            associationType:  (DS_AssociationTypeCode) crossReference
            initiativeType:  (DS_InitiativeTypeCode) userGuide
        spatialRepresentationType:  (MD_SpatialRepresentationTypeCode) grid
        language:  eng; USA
        topicCategory:  (MD_TopicCategoryCode) elevation
        environmentDescription:  Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.0.8321
        extent:  (EX_Extent)
            geographicElement:  (EX_GeographicBoundingBox)
                westBoundLongitude:  -134.66
                eastBoundLongitude:  -134.630024689
                southBoundLatitude:  56.23
                northBoundLatitude:  56.259975311
            temporalElement:  (EX_TemporalExtent)
                extent:
                  TimePeriod:
                    beginPosition:  1954-01-01
                    endPosition:  2017-01-01
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    contentInfo:  (MI_CoverageDescription)
        attributeDescription:
          RecordType:  Measure of elevation values in meters.
        contentType:  (MD_CoverageContentTypeCode) image
        dimension:  (MI_Band)
            descriptor:  Topography (m)
            maxValue:
              Real:  248.072006226
            minValue:
              Real:  -88.4689941406
            units:
              BaseUnit:
                identifier:  urn:ogc:def:uom:OGC::m
                name:  meter
                unitsSystem:  http://www.bipm.fr/en/si/
            bitsPerValue:  32
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    distributionInfo:  (MD_Distribution)
        distributionFormat:  (MD_Format)
            name:  NetCDF
            version:  1
            specification:  NetCDF
        distributor:  (MD_Distributor)
            distributorContact:  (CI_ResponsibleParty)
                organisationName:  NOAA National Centers for Environmental Information
                positionName:  DEM Information
                contactInfo:  (CI_Contact)
                    address:  (CI_Address)
                        electronicMailAddress:  dem.info@noaa.gov
                role:  (CI_RoleCode) pointOfContact
            distributionOrderProcess:  (MD_StandardOrderProcess)
                fees:  No Charge
            distributorTransferOptions:  (MD_DigitalTransferOptions)
                onLine:  (CI_OnlineResource)
                    linkage: http://www.ngdc.noaa.gov/thredds/catalog.html
                    protocol:  THREDDS Catalog
                    name:  NCEI Thredds Data Server
                    description:  NCEI Thredds Data Server
                    function:  (CI_OnLineFunctionCode) fileAccess
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    dataQualityInfo:  (DQ_DataQuality)
        scope:  (DQ_Scope)
            level:  (MD_ScopeCode) repository
            levelDescription:  (MD_ScopeDescription)
                other:  NOAA National Centers for Environmental Information
        lineage:  (LI_Lineage)
            processStep:  (LE_ProcessStep)
                description:  NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
                dateTime:
                  DateTime:  2015-04-22T00:00:00
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    dataQualityInfo:  (DQ_DataQuality)
        scope:  (DQ_Scope)
            level:  (MD_ScopeCode) dataset
        report:  (DQ_AbsoluteExternalPositionalAccuracy)
            nameOfMeasure:  Horizontal Positional Accuracy Report
            evaluationMethodDescription:  The horizontal accuracy of bathymetric and topographic features in the DEM is dependent upon DEM cell size and the accuracy of the input datasets used to determine corresponding cell values. Topography: Positional accuracy of input topographic datasets limits accuracy of corresponding cell values in DEM. Ifsar DTM topography: 12.2-meter Circular Error of 90% (CE90) 13.9-meter Circular Error of 95% (CE95) 5.682-meter Root Mean Square Error (RMSE) for x and y, GPS: less than 5 meters. DEM cell-value relative-contribution factors: GPS: 100, Ifsar DTM:1, DCRA: 100. Bathymetry: Positional accuracy of input bathymetric datasets limits accuracy of corresponding cell values in DEM. NOS survey data: from less than 1 meter to several kilometers. DEM cell-value relative-contribution factors: NOS surveys: 100, ENC: 1.
            result: (missing)
        report:  (DQ_AbsoluteExternalPositionalAccuracy)
            nameOfMeasure:  Vertical Positional Accuracy Report
            evaluationMethodDescription:  The vertical accuracy of bathymetric and topographic features in the DEM is dependent upon the accuracy of the input datasets used to determine corresponding cell values. Topography: 3-meter Confidence Level of 90% for a 0-10 degree slope. Vertical accuracy of input topographic datasets limits accuracy of corresponding cells in DEM. . DEM cell-value relative-contribution factors: GPS: 100, Ifsar DTM:1, DCRA: 100. Bathymetry: less than 1 meter to 5% of water depth. Vertical accuracy of input bathymetric datasets limits accuracy of corresponding cells in DEM. DEM cell-value relative-contribution factors: NOS surveys: 100, ENC: 1. Gridding interpolation to determine cell values between sparse soundings in deep water degrades the vertical accuracy of corresponding elevations.
            result: (missing)
        report:  (DQ_CompletenessCommission)
            evaluationMethodDescription:  NCEI made every effort to obtain all available digital topographic and bathymetric datasets in the region for use in building the DEM.
            result: (unknown)
        report:  (DQ_ConceptualConsistency)
            measureDescription:  Datasets were visually compared internally and externally (with other overlapping datasets and satellite images and maps) in ESRI ArcGIS for identification of anomalous elevations or data inconsistencies. Where elevation inconsistencies occurred, the most recent and/or highest resolution data set was selected for use in that region. Elevations in the older and/or lower-resolution datasets were deleted prior to building the DEM.
            result: (unknown)
        lineage:  (LI_Lineage)
            processStep:  (LE_ProcessStep)
                description:  All datasets obtained by NCEI were converted to common horizontal and vertical datums of WGS 84 geographic and Mean Higher High Water, respectively, based on tide station information. They were also converted to common file format, ESRI point shapefiles, for visualization and inspection.
                dateTime:
                  DateTime:  2018-09-19T00:00:00
                processor:  (CI_ResponsibleParty)
                    individualName:  Kelly Carignan
                    organisationName:  NOAA National Centers for Environmental Information
                    contactInfo:  (CI_Contact)
                        address:  (CI_Address)
                            electronicMailAddress:  kelly.carignan@noaa.gov
                    role:  (CI_RoleCode) pointOfContact
            processStep:  (LE_ProcessStep)
                description:  Datasets were visually inspected with ArcGIS and Global Mapper for identification and editing of data anomalies. Datasets were then compared with overlapping datasets to ensure data consistency.
                dateTime:
                  DateTime:  2018-10-11T00:00:00
            processStep:  (LE_ProcessStep)
                description:  xyz files of the bathymetric data were surfaced using GMT's 'surface' tool onto a 8/15 arc-second grid that interpolated to fill empty cells. Points extracted every 2 meters along the coastline were also included to ensure that the bathymetric grid reached zero at the coast. The resulting grid was clipped to the coastline to remove values over land.
                dateTime:
                  DateTime:  2018-10-15T00:00:00
            processStep:  (LE_ProcessStep)
                description:  xyz files for each input dataset were gridded using MB-System's 'mbgrid' tool, which utilizes a high-tension spline interpolation method to fill grid cells with no input elevation values. Preferential weighting was given to more recent, higher-accuracy datasets.
                dateTime:
                  DateTime:  2018-11-09T00:00:00
            processStep:  (LE_ProcessStep)
                description:  The DEM was quantitatively evaluated by comparing with source datasets.
                dateTime:
                  DateTime:  2018-11-16T00:00:00
            source:  (LI_Source)
                description:  Source Contribution: ENC soundings and depth contours
                sourceCitation:  (CI_Citation)
                    title:  Electronic Navigational Chart (ENC) digital soundings and depth contours charts US5AK3NM and US5AK08M
                    date:  (CI_Date)
                        date:  2017-04-13
                        dateType:  (CI_DateTypeCode) publication
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName:  OCS > NOAA Office of Coast Survey
                        role:  (CI_RoleCode) originator
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName: (inapplicable)
                        contactInfo:  (CI_Contact)
                            onlineResource:  (CI_OnlineResource)
                                linkage: http://www.nauticalcharts.noaa.gov/mcd/enc/index.htm
                                name:  Electronic Navigational Chart (ENC) soundings
                                description:  ENC soundings extracted from NOS charts
                                function:  (CI_OnLineFunctionCode) download
                        role: (inapplicable)
                sourceExtent:  (EX_Extent)
                    temporalElement:  (EX_TemporalExtent)
                        extent:
                          TimePeriod:
                            beginPosition:  2017-04-13
                            endPosition:  2017-06-01
            source:  (LI_Source)
                description:  NOS hydrographic survey data
                sourceCitation:  (CI_Citation)
                    title:  NOS Hydrographic Surveys
                    date:  (CI_Date)
                        date:  2008-01-01
                        dateType:  (CI_DateTypeCode) publication
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
                        role:  (CI_RoleCode) originator
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        positionName:  Citation URL
                        contactInfo:  (CI_Contact)
                            onlineResource:  (CI_OnlineResource)
                                linkage: http://www.ngdc.noaa.gov/mgg/bathymetry/hydro.html
                                name:  NOS Hydrographic Survey Database
                                description:  Digital database of NOS hydrographic surveys that date back to the late 19th century.
                                function:  (CI_OnLineFunctionCode) download
                        role: (inapplicable)
                sourceExtent:  (EX_Extent)
                    temporalElement:  (EX_TemporalExtent)
                        extent:
                          TimePeriod:
                            beginPosition:  1954-01-01
                            endPosition:  2015-01-01
            source:  (LI_Source)
                description:  Tidal information table from which vertical datum adjustment information are interpreted
                sourceCitation:  (CI_Citation)
                    title:  Bench Mark Data Sheet with Tidal Datum References
                    date:  (CI_Date)
                        date:  2018-09-19
                        dateType:  (CI_DateTypeCode) publication
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName:  DOC/NOAA/NOS National Ocean Service, NOAA, U.S. Department of Commerce
                        role:  (CI_RoleCode) originator
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        positionName:  Citation URL
                        contactInfo:  (CI_Contact)
                            onlineResource:  (CI_OnlineResource)
                                linkage: http://tidesandcurrents.noaa.gov/station_retrieve.shtml
                                name:  Tides and Currents Station Selection
                                description:  Bench Mark Data Sheet for station # 9451054 and # 9451204
                                function:  (CI_OnLineFunctionCode) information
                        role: (inapplicable)
                    presentationForm:  (CI_PresentationFormCode) documentDigital
                sourceExtent:  (EX_Extent)
                    temporalElement:  (EX_TemporalExtent)
                        extent:
                          TimePeriod:
                            beginPosition:  2001-04-01
                            endPosition:  2017-05-01
            source:  (LI_Source)
                description:  Interferometric Synthetic Aperture Radar Data (Ifsar) DTM
                sourceCitation:  (CI_Citation)
                    title:  Ifsar DTM
                    date:  (CI_Date)
                        date:  2014-12-19
                        dateType:  (CI_DateTypeCode) publication
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName:  Fugro EarthData, Inc.
                        role:  (CI_RoleCode) originator
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        positionName:  Citation URL
                        contactInfo:  (CI_Contact)
                            onlineResource:  (CI_OnlineResource)
                                linkage: https://elevation.alaska.gov/
                                name:  Elevation Datasets of Alaska
                                description:  This interactive map displays known public-domain elevation datasets in Alaska.
                                function:  (CI_OnLineFunctionCode) download
                        role: (inapplicable)
                sourceExtent:  (EX_Extent)
                    temporalElement:  (EX_TemporalExtent)
                        extent:
                          TimePeriod:
                            beginPosition:  2012-08-14
                            endPosition:  2012-09-08
            source:  (LI_Source)
                description:  GPS survey data obtained from UAF
                sourceCitation:  (CI_Citation)
                    title:  UAF Port Alexander and Wrangell GPS
                    date:  (CI_Date)
                        date: (unknown)
                        dateType:  (CI_DateTypeCode) publication
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName:  University of Alaska at Fairbanks
                        role:  (CI_RoleCode) originator
            source:  (LI_Source)
                description:  Topographic contour data
                sourceCitation:  (CI_Citation)
                    title:  DCRA topography
                    date:  (CI_Date)
                        date: (unknown)
                        dateType:  (CI_DateTypeCode) publication
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName:  State of Alaska, Division of Community and Regional Affairs (DCRA)
                        role:  (CI_RoleCode) originator
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    metadataMaintenance:  (MD_MaintenanceInformation)
        maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) annually
        dateOfNextUpdate:  2019-11-19
        contact:  (CI_ResponsibleParty)
            individualName:  Kelly Carignan
            organisationName:  NOAA National Centers for Environmental Information
            contactInfo:  (CI_Contact)
                address:  (CI_Address)
                    electronicMailAddress:  kelly.carignan@noaa.gov
            role:  (CI_RoleCode) pointOfContact
        contact:  (CI_ResponsibleParty)
            organisationName:  NOAA National Centers for Environmental Information
            positionName:  Metadata Specialist
            role:  (CI_RoleCode) editor
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    acquisitionInformation:  (MI_AcquisitionInformation)
        operation:  (MI_Operation)
            identifier:  (MD_Identifier)
                code:  NTHMP DEM Gridding Project
            status: (missing)
            parentOperation: (inapplicable)
        platform:  (MI_Platform)
            identifier:  (MD_Identifier)
                code:  Digital Elevation Model
            description: (missing)
            instrument: (missing)