NOAA GOES-R Series Advanced Baseline Imager (ABI) Level 2 Cloud Top Temperature (ACHT)


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            title:  NOAA GOES-R Series Advanced Baseline Imager (ABI) Level 2 Cloud Top Temperature (ACHT)
            alternateTitle:  ABI-L2-CTT
            date:  (CI_Date)
                date:  2018-02-16
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        abstract:  The GOES-R ABI Cloud Top Temperature product contains an image with pixel values identifying the atmospheric temperature at the top of a cloud layer. The product is generated in combination with the Cloud Top Height and Cloud Top Pressure products by the same algorithm. The product includes data quality information that provides an assessment of the cloud top height data values for on-earth pixels. The units of measure for the cloud top temperature value is kelvin. The Cloud Top Temperature product image is produced on the ABI fixed grid at 2 km resolution for Full Disk and Mesoscale coverage regions. Product data is produced under the following conditions: cloudy; Geolocated source data to local zenith angles of 70 degrees for both daytime and nighttime conditions.
        purpose:  The Cloud Top Height algorithm will use ABI infrared bands to simultaneously retrieve Cloud Top Height, Cloud Top Temperature, and Cloud Top Pressure for each cloudy pixel. These cloud products are a prerequisite for generating other downstream products that include the Cloud Layer product, Cloud Optical/Microphysical products, and the Derived Motion Wind products. Forecasters will be able to use this information to determine areas of cloud growth and likelihood of precipitation. Other operational applications of this product include its use in Aviation Terminal Aerodrome Forecasts (TAFs), supplementing upper-level cloud information to the ground-based Automated Surface Observing System (ASOS), and initialization of clouds in numerical weather prediction models.
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            otherConstraints:  Cite as: GOES-R Algorithm Working Group and GOES-R Series Program, (2018): NOAA GOES-R Series Advanced Baseline Imager (ABI) Level 2 Cloud Top Temperature (ACHT). [indicate subset used]. NOAA National Centers for Environmental Information. [access date].
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            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.
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                title:  A closer look at the ABI on the GOES-R series.
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                    date:  2017-04-24
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                    code:  doi:10.1175/BAMS-D-15-00230.1
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                            name:  Journal article published April 2017 by the AMS (American Meteorological Society)
                            description:  Schmit, T., Griffith, P., et al, (2017), A closer look at the ABI on the GOES-R series, Bull. Amer. Meteor. Soc., 98(4), 681–698, doi:10.1175/BAMS-D-15-00230.1.
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                    description:  ground condition
                    beginPosition:  2017-05-16
                    endPosition:
                    timeInterval:  15
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    contentInfo:  (MI_CoverageDescription)
        attributeDescription:
          RecordType:  OR_ABI-L2-ACHTF-M3_G16_sYYYYDDDHHMMSS_eYYYYDDDHHMMSS_cYYYYDDDHHMMSS.nc
        contentType:  (MD_CoverageContentTypeCode) physicalMeasurement
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  TEMP
                attributeType:
                  TypeName:
                    aName:  short
            descriptor:  ABI L2+ Cloud Top Temperature (air_temperature_at_cloud_top)
            units:  http://example.org/someUnitsDictionary.xml#K
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  DQF
                attributeType:
                  TypeName:
                    aName:  byte
            descriptor:  ABI L2+ Cloud Top Temperature data quality flags (status_flag)
            units:  http://example.org/someUnitsDictionary.xml#1
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  t
                attributeType:
                  TypeName:
                    aName:  double
            descriptor:  J2000 epoch mid-point between the start and end image scan in seconds (time)
            units:  http://example.org/someUnitsDictionary.xml#seconds%20since%202000-01-01%2012%3A00%3A00
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  y
                attributeType:
                  TypeName:
                    aName:  short
            descriptor:  GOES fixed grid projection y-coordinate (projection_y_coordinate)
            units:  http://example.org/someUnitsDictionary.xml#rad
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  x
                attributeType:
                  TypeName:
                    aName:  short
            descriptor:  GOES fixed grid projection x-coordinate (projection_x_coordinate)
            units:  http://example.org/someUnitsDictionary.xml#rad
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  time_bounds
                attributeType:
                  TypeName:
                    aName:  double
            descriptor:  Scan start and end times in seconds since epoch (2000-01-01 12:00:00)
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  goes_imager_projection
                attributeType:
                  TypeName:
                    aName:  int
            descriptor:  GOES-R ABI fixed grid projection
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  y_image
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  GOES-R fixed grid projection y-coordinate center of image (projection_y_coordinate)
            units:  http://example.org/someUnitsDictionary.xml#rad
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  y_image_bounds
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  GOES-R fixed grid projection y-coordinate north/south extent of image
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  x_image
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  GOES-R fixed grid projection x-coordinate center of image (projection_x_coordinate)
            units:  http://example.org/someUnitsDictionary.xml#rad
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  x_image_bounds
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  GOES-R fixed grid projection x-coordinate west/east extent of image
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  nominal_satellite_subpoint_lat
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  nominal satellite subpoint latitude (platform latitude) (latitude)
            units:  http://example.org/someUnitsDictionary.xml#degrees_north
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  nominal_satellite_subpoint_lon
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  nominal satellite subpoint longitude (platform longitude) (longitude)
            units:  http://example.org/someUnitsDictionary.xml#degrees_east
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  nominal_satellite_height
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  nominal satellite height above GRS 80 ellipsoid (platform altitude) (height_above_reference_ellipsoid)
            units:  http://example.org/someUnitsDictionary.xml#km
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  geospatial_lat_lon_extent
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  geospatial latitude and longitude references
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  outlier_pixels
                attributeType:
                  TypeName:
                    aName:  int
            descriptor:  number of cloud top temperature pixels whose value is outside valid measurement range
            units:  http://example.org/someUnitsDictionary.xml#count
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  minimum_cloud_top_temperature
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  minimum cloud top temperature (air_temperature_at_cloud_top)
            units:  http://example.org/someUnitsDictionary.xml#K
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  maximum_cloud_top_temperature
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  maximum cloud top temperature (air_temperature_at_cloud_top)
            units:  http://example.org/someUnitsDictionary.xml#K
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  mean_cloud_top_temperature
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  mean cloud top temperature (air_temperature_at_cloud_top)
            units:  http://example.org/someUnitsDictionary.xml#K
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  std_dev_cloud_top_temperature
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  standard deviation of cloud top temperature values (air_temperature_at_cloud_top)
            units:  http://example.org/someUnitsDictionary.xml#K
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  algorithm_dynamic_input_data_container
                attributeType:
                  TypeName:
                    aName:  int
            descriptor:  container for filenames of dynamic algorithm input data
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  processing_parm_version_container
                attributeType:
                  TypeName:
                    aName:  int
            descriptor:  container for processing parameter filenames
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  algorithm_product_version_container
                attributeType:
                  TypeName:
                    aName:  int
            descriptor:  container for algorithm package filename and product version
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  local_zenith_angle
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  threshold angle between the line of sight to the satellite and the local zenith at the observation target for good quality cloud top temperature, pressure and height data production (platform_zenith_angle)
            units:  http://example.org/someUnitsDictionary.xml#degree
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  local_zenith_angle_bounds
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  local zenith angle degree range where good quality cloud top temperature, pressure and height data is produced
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  solar_zenith_angle
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  threshold angle between the line of sight to the sun and the local zenith at the observation target for good quality cloud top temperature, pressure and height data production (solar_zenith_angle)
            units:  http://example.org/someUnitsDictionary.xml#degree
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  solar_zenith_angle_bounds
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  solar zenith angle degree range where good quality cloud top temperature, pressure and height data is produced
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  percent_uncorrectable_GRB_errors
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  percent data lost due to uncorrectable GRB errors
            units:  http://example.org/someUnitsDictionary.xml#percent
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  percent_uncorrectable_L0_errors
                attributeType:
                  TypeName:
                    aName:  float
            descriptor:  percent data lost due to uncorrectable L0 errors
            units:  http://example.org/someUnitsDictionary.xml#percent
        dimension:  (MD_Band)
            sequenceIdentifier:
              MemberName:
                aName:  cloud_pixels
                attributeType:
                  TypeName:
                    aName:  int
            descriptor:  number of cloudy or probably cloudy pixels
            units:  http://example.org/someUnitsDictionary.xml#count
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    distributionInfo:  (MD_Distribution)
        distributor:  (MD_Distributor)
            distributorContact:  (CI_ResponsibleParty)
                organisationName:  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
                positionName:  Customer Engagement Branch
                contactInfo:  (CI_Contact)
                    phone:  (CI_Telephone)
                        voice:  1-828-271-4800
                        facsimile:  1-828-271-4876
                    address:  (CI_Address)
                        deliveryPoint:  151 Patton Avenue
                        deliveryPoint:  Veach-Baley Federal Building, Room 468
                        city:  Asheville
                        administrativeArea:  NC
                        postalCode:  28801-5001
                        country:  USA
                        electronicMailAddress:  ncei.orders@noaa.gov
                    onlineResource:  (CI_OnlineResource)
                        linkage: https://www.ncei.noaa.gov
                        protocol:  HTTPS
                        applicationProfile:  Web Browser
                        name:  NOAA National Centers for Environmental Information (NCEI)
                        description:  NCEI home page with information, data access and contact information.
                        function:  (CI_OnLineFunctionCode) information
                    hoursOfService:  8:00 - 6:00 Eastern
                role:  (CI_RoleCode) distributor
            distributionOrderProcess:  (MD_StandardOrderProcess)
                fees:  In most cases, electronic downloads of the data are free, however fees may apply for data certifications, copies of analog materials, and data distribution on physical media.
            distributorFormat:  (MD_Format)
                name:  NetCDF
                version:  4
            distributorTransferOptions:  (MD_DigitalTransferOptions)
                onLine:  (CI_OnlineResource)
                    linkage: https://data.nodc.noaa.gov/cgi-bin/iso?id=gov.noaa.ncdc:C01507
                    protocol:  HTTPS
                    applicationProfile:  Landing Page
                    name:  NCEI landing page for this dataset
                    description:  Dataset landing page with general information and links to access the data.
                    function:  (CI_OnLineFunctionCode) information
                onLine:  (CI_OnlineResource)
                    linkage: https://www.ncdc.noaa.gov/airs-web/search
                    protocol:  HTTPS
                    applicationProfile:  Data Search Application
                    name:  NCEI Archive Information Request System
                    description:  Search the data archive and submit an order for the dataset via the interface.
                    function:  (CI_OnLineFunctionCode) order
                onLine:  (CI_OnlineResource)
                    linkage: http://www.class.noaa.gov/saa/products/search?datatype_family=GRABIPRD
                    protocol:  HTTPS
                    applicationProfile:  Data Search Application
                    name:  NOAA CLASS Data Search and Order
                    description:  Search the data archive and submit an order for the dataset via the interface.
                    function:  (CI_OnLineFunctionCode) order
                onLine:  (CI_OnlineResource)
                    linkage: https://www.ncdc.noaa.gov/data-access/satellite-data/goes-r-series-satellites
                    protocol:  HTTPS
                    applicationProfile:  Information
                    name:  NCEI GOES-R Program Webpage
                    description:  Webpage with product README files, general information, and data access links.
                    function:  (CI_OnLineFunctionCode) information
                onLine:  (CI_OnlineResource)
                    linkage: https://www.goes-r.gov/resources/docs.html
                    applicationProfile:  Information
                    name:  GOES-R Program Document Library
                    description:  Webpage with product algorithm, users guides, and education and outreach materials.
                    function:  (CI_OnLineFunctionCode) information
                onLine:  (CI_OnlineResource)
                    linkage: https://www.goes-r.gov/users/docs/PUG-main-vol1.pdf
                    applicationProfile:  Documentation
                    name:  Product Definition and Users' Guide (PUG) Vol.1 Main
                    description:  The Product Definition and User's Guide (PUG) document provides product descriptions and formats for all data and products produced and made available to users by the Geostationary Operational Environmental Satellite R Series (GOES-R) Core Ground Segment (GS).
                    function:  (CI_OnLineFunctionCode) information
                onLine:  (CI_OnlineResource)
                    linkage: https://www.goes-r.gov/products/docs/PUG-L2+-vol5.pdf
                    applicationProfile:  Documentation
                    name:  Product Definition and Users' Guide (PUG) Vol.5 Level 2+ Products
                    description:  The Product Definition and User's Guide (PUG) document provides product descriptions and formats for all data and products produced and made available to users by the Geostationary Operational Environmental Satellite R Series (GOES-R) Core Ground Segment (GS).
                    function:  (CI_OnLineFunctionCode) information
                onLine:  (CI_OnlineResource)
                    linkage: https://www.goes-r.gov/education/ABI-bands-quick-info.html
                    applicationProfile:  Information
                    name:  ABI Bands Quick Information Guides
                    description:  The fact sheets are designed as quick reference guides to provide users with information on each of the GOES-R series Advanced Baseline Imager's 16 spectral bands.
                    function:  (CI_OnLineFunctionCode) information
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    dataQualityInfo:  (DQ_DataQuality)
        scope:  (DQ_Scope)
            level:  (MD_ScopeCode) dataset
            extent:  #boundingExtent
        lineage:  (LI_Lineage)
            statement:  These data were produced by the NOAA Office of Satellite and Product Operations (OSPO) and are archived at the NOAA National Centers for Environmental Information (NCEI).
            processStep:  (LE_ProcessStep)
                description:  The Cloud Top Temperature, Cloud Top Pressure, and Cloud Top Height products are generated by the GOES-R ABI Cloud Top Height ground processing algorithm. The Cloud Top Height algorithm is an important component of the GOES-R ground processing precedence chain as the output of the algorithm is used in the generation of other ABI Level 2+ products. The algorithm retrieves a state vector composed of cloud top temperature, channel 14 emissivity, and band 15/14 beta ratio. It is retrieved using an optimal estimation technique. Cloud top pressure and height are then derived from cloud top temperature. The channel 14 emissivity and band 15/14 beta ratio are output as intermediate products. Pixels in the product image with out of range values are assigned the minimum or maximum value in the valid range. Cloudy conditions are determined using cloudy and probably cloudy pixels indicated in the temporally coincident intermediate 4-level cloud mask generated by the Cloud Mask algorithm. The Cloud Top Height algorithm operates on 2 km resolution pixels, generating intermediate temperature, pressure, and height products at this resolution, but the delivered Cloud Top Height and Pressure products are aggregated to 4 km or 10 km as needed to satisfy end user product resolution requirements.
                dateTime: (missing)
                processor:  (CI_ResponsibleParty)
                    organisationName:  DOC/NOAA/NESDIS/OSPO > Office of Satellite and Product Operations, NESDIS, NOAA, U.S. Department of Commerce
                    role:  (CI_RoleCode) processor
                source:  sd001
                processingInformation:  (LE_Processing)
                    identifier: (missing)
                    algorithm:  (LE_Algorithm)
                        citation:  (CI_Citation)
                            title:  GOES-R Algorithm Theoretical Basis Documents
                            date:  (CI_Date)
                                date:  2011-06-07
                                dateType:  (CI_DateTypeCode) publication
                            edition:  Version 2.0
                            citedResponsibleParty:  (CI_ResponsibleParty)
                                organisationName:  DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce
                                role:  (CI_RoleCode) publisher
                            citedResponsibleParty:  (CI_ResponsibleParty)
                                organisationName: (missing)
                                contactInfo:  (CI_Contact)
                                    onlineResource:  (CI_OnlineResource)
                                        linkage: https://www.goes-r.gov/products/ATBDs/baseline/Cloud_CldHeight_v2.0_no_color.pdf
                                        applicationProfile:  Web Browser
                                        name:  GOES-R Algorithm Theoretical Basis Documents for the Cloud Height product
                                        description:  Algorithm documentation for GOES-16 ABI Cloud Height.
                                        function:  (CI_OnLineFunctionCode) information
                                role: (missing)
                        description:  See Algorithm Citation
            processStep:  (LE_ProcessStep)
                description:  The GOES-16 ABI Cloud Top Temperature algorithm reached beta maturity.
                dateTime:
                  DateTime:  2017-05-16T00:00:00
                processor:  (CI_ResponsibleParty)
                    organisationName: (missing)
                    role:  (CI_RoleCode) processor
            processStep:  (LE_ProcessStep)
                description:  The GOES-16 ABI Cloud Top Temperature algorithm reached provisional maturity.
                dateTime:
                  DateTime:  2018-02-28T00:00:00
                processor:  (CI_ResponsibleParty)
                    organisationName: (missing)
                    role:  (CI_RoleCode) processor
            processStep:  (LE_ProcessStep)
                description:  The GOES-16 ABI Cloud Top Temperature algorithm reached full validation maturity.
                dateTime: (missing)
                processor:  (CI_ResponsibleParty)
                    organisationName: (missing)
                    role:  (CI_RoleCode) processor
            processStep:  (LE_ProcessStep)
                description:  The GOES-17 ABI Cloud Top Temperature algorithm reached beta maturity.
                dateTime:
                  DateTime:  2018-08-27T00:00:00
                processor:  (CI_ResponsibleParty)
                    organisationName: (missing)
                    role:  (CI_RoleCode) processor
            processStep:  (LE_ProcessStep)
                description:  The GOES-17 ABI Cloud Top Temperature algorithm reached provisional maturity.
                dateTime: (missing)
                processor:  (CI_ResponsibleParty)
                    organisationName: (missing)
                    role:  (CI_RoleCode) processor
            processStep:  (LE_ProcessStep)
                description:  The GOES-17 ABI Cloud Top Temperature algorithm reached full validation maturity.
                dateTime: (missing)
                processor:  (CI_ResponsibleParty)
                    organisationName: (missing)
                    role:  (CI_RoleCode) processor
            source:  (LE_Source)
                description:  Level 1b radiances
                sourceCitation:  (CI_Citation)
                    title:  NOAA GOES-R Series Advanced Baseline Imager (ABI) Level 1b Radiances
                    date:  (CI_Date)
                        date:  2017-06-01
                        dateType:  (CI_DateTypeCode) publication
                    edition:  Provisional
                    identifier:  (MD_Identifier)
                        code:  doi:10.7289/V5BV7DSR
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName:  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
                        role:  (CI_RoleCode) distributor
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName: (missing)
                        contactInfo:  (CI_Contact)
                            onlineResource:  (CI_OnlineResource)
                                linkage: https://doi.org/10.7289/V5BV7DSR
                                protocol:  HTTPS
                                applicationProfile:  Web Browser
                                name:  NCEI landing page for ABI-L1B-RAD
                                description:  Source dataset landing page with general information and access links for the dataset.
                                function:  (CI_OnLineFunctionCode) information
                        role: (missing)
                sourceExtent:  (EX_Extent)
                    geographicElement:  (EX_GeographicBoundingBox)
                        extentTypeCode:  1
                        westBoundLongitude:  -156.2
                        eastBoundLongitude:  6.2995
                        southBoundLatitude:  -81.32
                        northBoundLatitude:  81.328
                    geographicElement:  (EX_GeographicBoundingBox)
                        extentTypeCode:  1
                        westBoundLongitude:  141.7005
                        eastBoundLongitude:  -55.7005
                        southBoundLatitude:  -81.3282
                        northBoundLatitude:  81.3282
                    temporalElement:  (EX_TemporalExtent)
                        extent:
                          TimePeriod:
                            beginPosition:  2017-02-28
                            endPosition:
                sourceStep:  ps001
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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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    metadataMaintenance:  (MD_MaintenanceInformation)
        maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) asNeeded
        maintenanceNote:  Bulk metadata change applied on 2018-11-05. See version control repository history for metadata change details.