<?xml version="1.0" encoding="UTF-8" standalone="no"?>

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<?xml-model href="https://pds.nasa.gov/pds4/cart/v1/PDS4_CART_1900.sch" schematypens="http://purl.oclc.org/dsdl/schematron"?>
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<Product_Observational xmlns="http://pds.nasa.gov/pds4/pds/v1" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns:mess="http://pds.nasa.gov/pds4/mission/mess/v1"
  xmlns:disp="http://pds.nasa.gov/pds4/disp/v1"
  xmlns:cart="http://pds.nasa.gov/pds4/cart/v1"
  xsi:schemaLocation="
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  http://pds.nasa.gov/pds4/disp/v1 https://pds.nasa.gov/pds4/disp/v1/PDS4_DISP_1700.xsd
  http://pds.nasa.gov/pds4/cart/v1 https://pds.nasa.gov/pds4/cart/v1/PDS4_CART_1900.xsd
  http://pds.nasa.gov/pds4/mission/mess/v1 https://pds.nasa.gov/pds4/mission/mess/v1/PDS4_MESS_1B00_1020.xsd">
  <Identification_Area>
    <logical_identifier>urn:nasa:pds:mess_mla_calibrated:data_gdr:hdem_16</logical_identifier>
    <version_id>1.0</version_id>
    <title>MESSENGER MLA GDR:hdem_16</title>
    <information_model_version>1.10.1.0</information_model_version>
    <product_class>Product_Observational</product_class>
    <Modification_History>
      <Modification_Detail>
        <modification_date>2018-07-24</modification_date>
        <version_id>1.0</version_id>
        <description>PDS4 migrated product.</description>
      </Modification_Detail>
    </Modification_History>
  </Identification_Area>
  <Observation_Area>
    <Time_Coordinates>
      <start_date_time>2008-01-14T00:00:00Z</start_date_time>
      <stop_date_time>2015-04-30T00:00:00Z</stop_date_time>
    </Time_Coordinates>
    <Investigation_Area>
      <name>MESSENGER</name>
      <type>Mission</type>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:investigation:mission.messenger</lid_reference>
        <reference_type>data_to_investigation</reference_type>
      </Internal_Reference>
    </Investigation_Area>
    <Observing_System>
      <Observing_System_Component>
        <name>MESSENGER</name>
        <type>Spacecraft</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.mess</lid_reference>
          <reference_type>is_instrument_host</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
      <Observing_System_Component>
        <name>Mercury Laser Altimeter</name>
        <type>Instrument</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument:mla.mess</lid_reference>
          <reference_type>is_instrument</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
    </Observing_System>
    <Target_Identification>
      <name>Mercury</name>
      <type>Planet</type>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:target:planet.mercury</lid_reference>
        <reference_type>data_to_target</reference_type>
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    </Target_Identification>
    <Mission_Area>
      <mess:MESSENGER>
        <mess:standard_data_product_id>mlasciencegdr</mess:standard_data_product_id>
      </mess:MESSENGER>
    </Mission_Area>
    <Discipline_Area>
      <disp:Display_Settings>
        <Local_Internal_Reference>
          <local_identifier_reference>gdr_hdem_16</local_identifier_reference>
          <local_reference_type>display_settings_to_array</local_reference_type>
        </Local_Internal_Reference>
        <disp:Display_Direction>
          <disp:horizontal_display_axis>Sample</disp:horizontal_display_axis>
          <disp:horizontal_display_direction>Left to Right</disp:horizontal_display_direction>
          <disp:vertical_display_axis>Line</disp:vertical_display_axis>
          <disp:vertical_display_direction>Top to Bottom</disp:vertical_display_direction>
        </disp:Display_Direction>
      </disp:Display_Settings>     
      <cart:Cartography>
        <Local_Internal_Reference>
          <local_identifier_reference>gdr_hdem_16</local_identifier_reference>
          <local_reference_type>cartography_parameters_to_image_object</local_reference_type>
        </Local_Internal_Reference>
        <cart:Spatial_Domain>
          <cart:Bounding_Coordinates>
            <cart:west_bounding_coordinate unit="deg">0.0</cart:west_bounding_coordinate>
            <cart:east_bounding_coordinate unit="deg">360.0</cart:east_bounding_coordinate>
            <cart:north_bounding_coordinate unit="deg">90.0</cart:north_bounding_coordinate>
            <cart:south_bounding_coordinate unit="deg">-18.0</cart:south_bounding_coordinate>
          </cart:Bounding_Coordinates>
        </cart:Spatial_Domain>
        <cart:Spatial_Reference_Information>
          <cart:Horizontal_Coordinate_System_Definition>
            <cart:Planar>
              <cart:Map_Projection>
                <cart:map_projection_name>Equirectangular</cart:map_projection_name>
                <cart:Equirectangular>
                  <cart:standard_parallel_1 unit="deg">0</cart:standard_parallel_1>
                  <cart:longitude_of_central_meridian unit="deg">180.0</cart:longitude_of_central_meridian>
                  <cart:latitude_of_projection_origin unit="deg">0.0</cart:latitude_of_projection_origin>
                </cart:Equirectangular>
              </cart:Map_Projection>
              <cart:Planar_Coordinate_Information>
                <cart:planar_coordinate_encoding_method>Coordinate Pair</cart:planar_coordinate_encoding_method>
                <cart:Coordinate_Representation>
                  <cart:pixel_resolution_x unit="m/pixel">2660.97</cart:pixel_resolution_x>
                  <cart:pixel_resolution_y unit="m/pixel">2660.97</cart:pixel_resolution_y>
                  <cart:pixel_scale_x unit="pixel/deg">16.0</cart:pixel_scale_x>
                  <cart:pixel_scale_y unit="pixel/deg">16.0</cart:pixel_scale_y>
                </cart:Coordinate_Representation>
              </cart:Planar_Coordinate_Information>
              <cart:Geo_Transformation>
                <cart:upperleft_corner_x unit="m">-7662263.115</cart:upperleft_corner_x>
                <cart:upperleft_corner_y unit="m">3830466.315</cart:upperleft_corner_y>
              </cart:Geo_Transformation>
            </cart:Planar>
            <cart:Geodetic_Model>
              <cart:latitude_type>planetocentric</cart:latitude_type>
              <cart:spheroid_name>mercury</cart:spheroid_name>
              <cart:semi_major_radius unit="m">2439400.0</cart:semi_major_radius>
              <cart:semi_minor_radius unit="m">2439400.0</cart:semi_minor_radius>
              <cart:polar_radius unit="m">2439400.0</cart:polar_radius>
              <cart:longitude_direction>Positive East</cart:longitude_direction>
            </cart:Geodetic_Model>
          </cart:Horizontal_Coordinate_System_Definition>
        </cart:Spatial_Reference_Information>
      </cart:Cartography>
    </Discipline_Area>
  </Observation_Area>
  <File_Area_Observational>
    <File>
      <file_name>hdem_16.img</file_name>
      <creation_date_time>2016-12-10T00:00:00Z</creation_date_time>
      <file_size unit="byte">19906560</file_size>
      <comment>This data product is a map of data counts
        for the gridded data product of the corresponding filename,
        of Mercury at a resolution of 2.66097 km/pix by 2.66097 km/pix,
        based on altimetry data acquired through the Mapping Phase
        by the MLA instrument. The gridded topographic data products
        are the source for this data set, which contains the number of
        observations per pixel that have been used to produce the data
        products. The map is in the form of a binary table with one row
        for each 0.0625 degrees of latitude, pixel registered.        
        This label describes an IMG file in the form of a binary resampling
        to pixel registration.
        /* Conversion from Digital Number to HEIGHT, i.e. elevation in meters, is: */
        /* HEIGHT = (DN * SCALING_FACTOR).                                         */
        /* The conversion from Digital Number to PLANETARY_RADIUS in meters is:    */
        /* PLANETARY_RADIUS = (DN * SCALING_FACTOR) + OFFSET                       */
      </comment>
    </File>
    <Array_2D_Map>
      <name>gdr topographic height</name>
      <local_identifier>gdr_hdem_16</local_identifier>
      <offset unit="byte">0</offset>
      <axes>2</axes>
      <axis_index_order>Last Index Fastest</axis_index_order>
      <Element_Array>
        <data_type>SignedLSB2</data_type>
        <unit>meter</unit>
        <scaling_factor>0.5</scaling_factor>
        <value_offset>2439400</value_offset>
      </Element_Array>
      <Axis_Array>
        <axis_name>Line</axis_name>
        <elements>1728</elements>
        <sequence_number>1</sequence_number>
      </Axis_Array>
      <Axis_Array>
        <axis_name>Sample</axis_name>
        <elements>5760</elements>
        <sequence_number>2</sequence_number>
      </Axis_Array>
      <Special_Constants>
        <missing_constant>-32768</missing_constant>
      </Special_Constants>
      <Object_Statistics>
        <maximum>9344</maximum>
        <minimum>-11190</minimum>
      </Object_Statistics>
    </Array_2D_Map>
  </File_Area_Observational>
  <File_Area_Observational_Supplemental>
    <File>
      <file_name>hdem_16.lbl</file_name>
    </File>
    <Stream_Text>
      <offset unit="byte">0</offset>
      <parsing_standard_id>PDS3</parsing_standard_id>
      <description>Original PDS3 label</description>
      <record_delimiter>Carriage-Return Line-Feed</record_delimiter>
    </Stream_Text>
  </File_Area_Observational_Supplemental>
</Product_Observational>
