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    <logical_identifier>urn:nasa:pds:a16photosupportdata:geom_orbital_photo_ephem</logical_identifier>
    <version_id>1.0</version_id>
    <title>Apollo 16 Metric (Mapping) and Panoramic Cameras - Photographic Ephemeris Support Data
    Collection</title>
    <information_model_version>1.7.0.0</information_model_version>
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    <Citation_Information>
      <author_list>Robinson, M.S.; Cisneros, E.; Paris, C.N.</author_list>
      <editor_list>Williams, D.R.; McLaughlin, S.A.</editor_list>
      <publication_year>2017</publication_year>
      <description>This collection contains comma-separated ASCII tables of ephemeris data
      (spacecraft state vectors, camera orientation, photograph position, and lighting data)
      computed during the Apollo era for analyzing and using photographic images taken of the moon
      on 20-24 April 1972 by the Apollo 16 Metric (Mapping) and Panoramic Cameras from lunar
      orbit. These tables were produced using optical character recognition (OCR) software to read
      TIFF images of scanned tabular output on microfilm. These scans were merged and provided in
      this collection as two PDF/A files, one for each camera.</description>
    </Citation_Information>
    <Modification_History>
      <Modification_Detail>
        <modification_date>2018-06-14</modification_date>
        <version_id>1.0</version_id>
        <description>Creation.</description>
      </Modification_Detail>
    </Modification_History>
  </Identification_Area>
  <Context_Area>
    <Time_Coordinates>
      <start_date_time>1972-04-20T02:31:19.086Z</start_date_time>
      <stop_date_time>1972-04-24T23:32:28.178Z</stop_date_time>
    </Time_Coordinates>
    <Primary_Result_Summary>
      <purpose>Observation Geometry</purpose>
      <processing_level>Derived</processing_level>
      <description>Ephemeris data (spacecraft state vectors, camera orientation, photograph
      position, and lighting data) computed during the Apollo era for photographic images taken by
      the Apollo 16 Metric (Mapping) and Panoramic Cameras of the moon from lunar orbit during the
      time span of April 20-24, 1972.</description>
    </Primary_Result_Summary>
    <Investigation_Area>
      <name>Apollo 16</name>
      <type>Mission</type>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:investigation:mission.apollo_16</lid_reference>
        <reference_type>collection_to_investigation</reference_type>
      </Internal_Reference>
    </Investigation_Area>
    <Observing_System>
      <Observing_System_Component>
        <name>Apollo 16 Command and Service Module</name>
        <type>Spacecraft</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.a16c</lid_reference>
          <reference_type>is_instrument_host</reference_type>
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      </Observing_System_Component>
      <Observing_System_Component>
        <name>Apollo 16 Metric (Mapping) Camera</name>
        <type>Instrument</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument:metriccam.a16c</lid_reference>
          <reference_type>is_instrument</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
      <Observing_System_Component>
        <name>Apollo 16 Panoramic Camera (Pancam)</name>
        <type>Instrument</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument:pancam.a16c</lid_reference>
          <reference_type>is_instrument</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
    </Observing_System>
    <Target_Identification>
      <name>Moon</name>
      <type>Satellite</type>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:target:satellite.earth.moon</lid_reference>
        <reference_type>collection_to_target</reference_type>
      </Internal_Reference>
    </Target_Identification>
  </Context_Area>
  <Reference_List>
    <Internal_Reference>
      <lid_reference>urn:nasa:pds:a16photosupportdata:geom_orbital_photo_ephem:as16_ephem_data_descr</lid_reference>
      <reference_type>collection_to_document</reference_type>
      <comment>Describes the contents of this collection</comment>
    </Internal_Reference>
    <Internal_Reference>
      <lid_reference>urn:nasa:pds:apollodoc:a16doc:a16c_metriccam_overview</lid_reference>
      <reference_type>collection_to_document</reference_type>
      <comment>Brief overview of Apollo 16 Metric (Mapping) Camera</comment>
    </Internal_Reference>
    <Internal_Reference>
      <lid_reference>urn:nasa:pds:apollodoc:a16doc:a16c_pancam_overview</lid_reference>
      <reference_type>collection_to_document</reference_type>
      <comment>Brief overview of Apollo 16 Panoramic Camera</comment>
    </Internal_Reference>
    <Internal_Reference>
      <lid_reference>urn:nasa:pds:apollodoc:a16doc:ap16_ape_data_book</lid_reference>
      <reference_type>collection_to_document</reference_type>
      <comment>Apollo 16 Photograph Evaluation (APE) Data Book, NASA MSC-07396, reproduces sample
      printouts of support data, such as state vectors and geometry, for the first and last frames
      from each sequence of images acquired by the Apollo 16 Metric (Mapping) Camera and Panoramic
      Camera, the two systems in the Scientific Instrument (SIM) Bay of the Service Module. It also
      defines the computed ephemeris data variables.</comment>
    </Internal_Reference>
    <Internal_Reference>
      <lid_reference>urn:nasa:pds:apollodoc:commondoc:apollo_photo_evaluation_programming_manual</lid_reference>
      <reference_type>collection_to_document</reference_type>
      <comment>Apollo Photograph Evaluation (APE) Programming Manual, NASA CR-134218, describes the
      programming techniques used to implement the equations of the APE computer program and defines
      the computed ephemeris data variables.</comment>
    </Internal_Reference>
    <Internal_Reference>
      <lid_reference>urn:nasa:pds:apollodoc:a16doc:ap16_data_notes</lid_reference>
      <reference_type>collection_to_document</reference_type>
      <comment>Data Users Note: Apollo 16 Lunar Photography, NSSDC-73-01, announces the availability
      of Apollo 16 pictorial data as an aid to the selection of the photographs for study. It
      includes descriptions of service module photography, command module photography, and lunar
      surface photography along with brief explanations of the Apollo 16 mission objectives,
      photographic equipment, and photographic coverage and quality. It includes samples of the
      photographic ephemeris support data.</comment>
    </Internal_Reference>
    <Internal_Reference>
      <lid_reference>urn:nasa:pds:apollodoc:a16doc:ap16_sim_index</lid_reference>
      <reference_type>collection_to_document</reference_type>
      <comment>Apollo 16 Index of Mapping Camera and Panoramic Camera Photographs, NASA MSC-072561,
      contains descriptions of all photographs from the Apollo 16 Panoramic Camera and Metric
      (Mapping) Camera, the two systems in the Scientific Instrument (SIM) Bay of the Service
      Module.</comment>
    </Internal_Reference>
    <Internal_Reference>
      <lid_reference>urn:nasa:pds:apollodoc:a16doc:ap16_supplement_sim_photo_equip</lid_reference>
      <reference_type>collection_to_document</reference_type>
      <comment>Apollo SIM Bay Photographic Equipment and Mission Summary - Apollo 16 Supplement,
      NASA Johnson Space Center, not numbered, 1972, summarizes the Spectral Imaging Module (SIM)
      Bay photographic experiments, in flight operations, and pre-launch calibrations for the Apollo
      16 mission.</comment>
    </Internal_Reference>
    <External_Reference>
      <reference_text>Apollo 16 Preliminary Science Report, NASA SP-315, published by NASA,
      Washington, D.C., 1972.</reference_text>
    </External_Reference>
    <External_Reference>
      <reference_text>Apollo Scientific Experiments Data Handbook, NASA Technical Memorandum
      X-58131, JSC-09166, published by NASA Johnson Space Center, Houston, Texas, Aug. 1974 (revised
      Apr. 1976).</reference_text>
    </External_Reference>
  </Reference_List>
  <Collection>
    <collection_type>Data</collection_type>
  </Collection>
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