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2002 NASA/USGS Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for California, Oregon, and Washington Coastlines


    fileIdentifier:  gov.noaa.csc.maps:2002_WestC_m14
    language:  eng; USA
    characterSet:  (MD_CharacterSetCode) utf8
    hierarchyLevel:  (MD_ScopeCode) dataset
    contact:  Mike Sutherland(author) (CI_ResponsibleParty)
        role:  (CI_RoleCode) author
    dateStamp:  2013-05-07
    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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    spatialRepresentationInfo:  (MD_VectorSpatialRepresentation)
        geometricObjects:  (MD_GeometricObjects)
            geometricObjectType:  (MD_GeometricObjectTypeCode) point
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    referenceSystemInfo:  (MD_ReferenceSystem)
        referenceSystemIdentifier:  (RS_Identifier)
            code:  Ellipsoid in Meters
            codeSpace:  Local Vertical Reference
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    identificationInfo:  (MD_DataIdentification)
        citation:  (CI_Citation)
            title:  2002 NASA/USGS Airborne LiDAR Assessment of Coastal Erosion (ALACE) Project for California, Oregon, and Washington Coastlines
            date:  (CI_Date)
                dateType:  (CI_DateTypeCode) publication
            citedResponsibleParty:  NOAA CSC (originator)
            citedResponsibleParty:  (CI_ResponsibleParty)
                organisationName:  DOI/USGS > United States Geological Survey, U.S. Department of the Interior
                role:  (CI_RoleCode) originator
            citedResponsibleParty:  (CI_ResponsibleParty)
                organisationName:  National Aeronautics and Space Administration (NASA)
                role:  (CI_RoleCode) originator
            citedResponsibleParty:  NOAA CSC (publisher) (CI_ResponsibleParty)
                role:  (CI_RoleCode) publisher
            presentationForm:  (CI_PresentationFormCode) imageDigital
        abstract:  Laser beach mapping uses a pulsed laser ranging system mounted onboard an aircraft to measure ground elevation and coastal topography. The laser emits laser beams at high frequency and is directed downward at the earth's surface through a port opening in the bottom of the aircraft's fuselage. The laser system records the time difference between emission of the laser beam and the reception of the reflected laser signal in the aircraft. The aircraft travels over the beach at approximately 60 meters per second while surveying from the low water line to the landward base of the sand dunes.
        purpose:  This data was collected as part of an effort by the USGS and NASA to map beach topography and assess beach change for the states of California, Oregon and Washington.
        credit:  This Airborne Topographic Mapper LIDAR data set was collected in partnership with the NASA Wallops Flight Facility, and the U. S. Geological Survey (USGS) Center for Coastal and Regional Marine Geology.
        status:  (MD_ProgressCode) completed
        pointOfContact:  NOAA CSC (pointOfContact) (CI_ResponsibleParty)
            role:  (CI_RoleCode) pointOfContact
        resourceMaintenance:  (MD_MaintenanceInformation)
            maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) notPlanned
        descriptiveKeywords:  (MD_Keywords)
            keyword:  Bathymetry/Topography
            keyword:  lidar
            keyword:  laser
            keyword:  beach
            keyword:  digital elevation model
            keyword:  DEM
            keyword:  erosion
            type:  (MD_KeywordTypeCode) theme
            thesaurusName:  (CI_Citation)
                title:  None
        descriptiveKeywords:  (MD_Keywords)
            keyword:  United States
            keyword:  California
            keyword:  Oregon
            keyword:  Washington
            type:  (MD_KeywordTypeCode) place
            thesaurusName:  (CI_Citation)
                title:  None
        resourceConstraints:  Lidar Use Limitation
        resourceConstraints:  NOAA Legal Statement
        spatialRepresentationType:  (MD_SpatialRepresentationTypeCode) vector
        language:  eng; USA
        topicCategory:  (MD_TopicCategoryCode) elevation
        extent:  (EX_Extent)
            geographicElement:  (EX_GeographicBoundingBox)
                westBoundLongitude:  -128.111
                eastBoundLongitude:  -119.611
                southBoundLatitude:  36.933602
                northBoundLatitude:  48.389465
            temporalElement:  (EX_TemporalExtent)
                    beginPosition:  2002-09-18
                    endPosition:  2002-10-03
        supplementalInformation:  This data set was collected with the NASA Airborne Topographic Lidar 3 (ATM3) LIDAR (LIght Detection and Ranging) instrument which was designed and developed by the NASA Observational Science Branch (OSB Code 972) Goddard Space Flight Center, Wallops Island VA. The ATM3 measures the time of flight of a narrow pulse (5 nanoseconds) of green laser light (532 nm) from the aircraft to the ground and back to the aircraft. The laser is pulsed at 5000 Hz and the pulses are reflected from a 22 degree off-nadir scanning mirror rotating at 20 Hz which directs the laser light and the telescope view in an elliptical scan pattern under the aircraft. The telescope collects the reflected laser light which passes through a narrow bandpass filter (to reject background light) and is detected by a photomultiplier tube detector. The ATM3 time of flight measurements are calibrated and combined with GPS data (to provide position) and aircraft inertial gyro data (to provide the aircraft attitude when each laser measurement was recorded) resulting in a calculated latitude, longitude, and elevation for each laser spot in the 250 laser shot elliptical scan under the aircraft. The scan pattern (at 22 degrees off nadir) covers a width of ~ 560 meters from a nominal aircraft altitude of 700 meters. Depending on aircraft ground speed, several consecutive scans may overlap along the aircraft flight track. Normally parallel flight tracks will be flown with ~20% overlap to cover areas wider than a single ATM3 scan width. The resultant data set is normally resampled and binned to create a digital elevation model of the desired area. Note: The Spatial Reference section of this document may lack fully FGDC-compliant information regarding projection parameters (i.e., Central meridian, false Northing, etc.). The State Plane or UTM Zone will be supplied, and the corresponding parameters can be found in Appendix C of: Snyder, John, 1987, Map Projections, a Working Manual (U.S. Geological Survey Professional Paper 1395): Washington, U.S. Government Printing Office.
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    distributionInfo:  (MD_Distribution)
        distributionFormat:  (MD_Format)
            name:  LAZ
        distributor:  (MD_Distributor)
            distributorContact:  NOAA CSC(distributor) (CI_ResponsibleParty)
                role:  (CI_RoleCode) distributor
            distributionOrderProcess:  (MD_StandardOrderProcess)
                orderingInstructions:  The National Geophysical Data Center serves as the archive for this LIDAR data. NGDC should only be contacted for this data if it cannot be obtained from NOAA Coastal Services Center.
        distributor:  (MD_Distributor)
            distributorContact:  Mike Sutherland
            distributionOrderProcess:  (MD_StandardOrderProcess)
                orderingInstructions:  The National Geophysical Data Center serves as the archive for this LIDAR dataset. NGDC should only be contacted for the data if it cannot be obtained from NOAA Coastal Services Center.
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    dataQualityInfo:  (DQ_DataQuality)
        scope:  (DQ_Scope)
            level:  (MD_ScopeCode) dataset
        report:  (DQ_AbsoluteExternalPositionalAccuracy)
            nameOfMeasure:  Horizontal Positional Accuracy Report
            evaluationMethodDescription:  The ATM LIDAR elevation points are estimated to be horizontally accurate to +/- 0.8 meters at an aircraft altitude of 700 meters.
        report:  (DQ_AbsoluteExternalPositionalAccuracy)
            nameOfMeasure:  Vertical Positional Accuracy Report
            evaluationMethodDescription:  The accuracy of this data set has not been validated against ground truth measurements. An internal consistency check of the data was conducted. The process compared elevation points determined to be over beaches and non-vegetated areas from overlapping flights. The elevation of points within a meter of each other were compared. The average RSME of the 60 sample areas each containing on average 1311 common points was 18.5 cm. In comparisons of another ATM LIDAR data set for a small geographic region to various ground surveys the differences are between +/- 15 to 20 centimeters. The accuracy of the majority of this data set is estimated to be consistent with the above stated results.
        report:  (DQ_CompletenessCommission)
            evaluationMethodDescription:  None
        report:  (DQ_ConceptualConsistency)
            measureDescription:  Not applicable.
        lineage:  (LI_Lineage)
            processStep:  (LE_ProcessStep)
                description:  The xyz coordinates of this data set were transformed from ITRF_2000 to ITRF_1994 using datum transformation parameters from the National Geodetic Surveys HTDP software.
                  DateTime:  2004-08-01T00:00:00
            processStep:  (LE_ProcessStep)
                description:  The vertical values in this data set have been filtered through visual inspection to find abnormally high and abnormally low values. In addition, these data have been filtered using a spatial filtering program that identifies and discards outlier elevation measurements. This program reads each elevation measurement within a file and identifies "spatially close" points (i.e. those neighboring points within a fixed radius of the point). The mean and standard deviation is calculated using the elevations of these points. If the elevation difference from the mean of the point under consideration is more than 2 standard deviations and greater than a defined distance the point is discarded.
            processStep:  (LE_ProcessStep)
                description:  The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp transfer from the NOAA Coastal Services Center. The data are currently being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/. The data can be used to re-populate the system. The data are archived in LAS or LAZ format. The LAS format is an industry standard for LiDAR data developed by the American Society of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless compressed version of LAS developed by Martin Isenburg (http://www.laszip.org/). The data are exclusively in geographic coordinates (either NAD83 or ITRF94). The data are referenced vertically to the ellipsoid (either GRS80 or ITRF94), allowing for the ability to apply the most up to date geoid model when transforming to orthometric heights.
                  DateTime:  2011-04-26T00:00:00
                processor:  (CI_ResponsibleParty)
                    individualName:  Pamela Grothe
                    organisationName:  DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
                    contactInfo:  (CI_Contact)
                        contactInstructions:  Contact Data Center
                    role:  (CI_RoleCode) processor
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    metadataMaintenance:  (MD_MaintenanceInformation)
        maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) annually
        dateOfNextUpdate:  2014-05-07
        maintenanceNote:  This metadata was automatically generated from the FGDC Content Standards for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2013-01-04 version of the FGDC RSE to ISO 19115-2 for LiDAR transform.
        maintenanceNote:  Translated from FGDC 2013-05-07T15:16:35.693-06:00
        maintenanceNote:  Last Metadata Review Date: 2011-11-19