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<Product_Observational xmlns="http://pds.nasa.gov/pds4/pds/v1"
    xmlns:cart="http://pds.nasa.gov/pds4/cart/v1"
    xmlns:disp="http://pds.nasa.gov/pds4/disp/v1"
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  <Identification_Area>
    <logical_identifier>urn:nasa:pds:magellan_gravity:gravity:geoid</logical_identifier>
    <version_id>1.0</version_id>
    <title>Magellan Gravity and Spherical Harmonic Data: geoid.dat</title>
    <information_model_version>1.20.0.0</information_model_version>
    <product_class>Product_Observational</product_class>
    <Citation_Information>
      <author_list>Sjogren, William L.</author_list>
      <publication_year>1996</publication_year>
      <description>A digital map of Venus geoid derived from radio  
        tracking of the Magellan spacecraft.</description>
    </Citation_Information>
    <Modification_History>
      <Modification_Detail>
        <modification_date>2023-09-06</modification_date>
        <version_id>1.0</version_id>
        <description>Product migrated to PDS4 from PDS3.</description>
      </Modification_Detail>
    </Modification_History>
  </Identification_Area>
  <Observation_Area>
    <Time_Coordinates>
      <start_date_time xsi:nil="true" nilReason="inapplicable"/>
      <stop_date_time xsi:nil="true" nilReason="inapplicable"/>
    </Time_Coordinates>
    <Investigation_Area>
      <name>Magellan</name>
      <type>Mission</type>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:investigation:mission.magellan</lid_reference>
        <reference_type>data_to_investigation</reference_type>
      </Internal_Reference>
    </Investigation_Area>
    <Observing_System>
      <Observing_System_Component>
        <name>Magellan</name>
        <type>Host</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.mgn</lid_reference>
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      </Observing_System_Component>
      <Observing_System_Component>
        <name>Radio Science Subsystem</name>
        <type>Instrument</type>
        <Internal_Reference>
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          <reference_type>is_instrument</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
    </Observing_System>
    <Target_Identification>
      <name>Venus</name>
      <type>Planet</type>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:target:planet.venus</lid_reference>
        <reference_type>data_to_target</reference_type>
      </Internal_Reference>
    </Target_Identification>
    <Mission_Area>
      <mgn:Magellan_Parameters>
        <mgn:product_type>SHXDR</mgn:product_type>
        <mgn:start_orbit_number>5758</mgn:start_orbit_number>
        <mgn:stop_orbit_number>15019</mgn:stop_orbit_number>
        <mgn:producer_institution_name>JET PROPULSION LABORATORY</mgn:producer_institution_name>
      </mgn:Magellan_Parameters>
    </Mission_Area>
    <Discipline_Area>
      <cart:Cartography>
        <Local_Internal_Reference>
          <local_identifier_reference>Image_Object</local_identifier_reference>
          <local_reference_type>cartography_parameters_to_image_object</local_reference_type>
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        <cart:Spatial_Domain>
          <cart:Bounding_Coordinates>
            <cart:west_bounding_coordinate unit="deg">-120.0</cart:west_bounding_coordinate>
            <cart:east_bounding_coordinate unit="deg">240.0</cart:east_bounding_coordinate>
            <cart:north_bounding_coordinate unit="deg">90.0</cart:north_bounding_coordinate>
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        </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>
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                  <cart:longitude_of_central_meridian unit="deg">0</cart:longitude_of_central_meridian>
                </cart:Equirectangular>
              </cart:Map_Projection>
              <cart:Planar_Coordinate_Information>
                <cart:planar_coordinate_encoding_method>Coordinate Pair</cart:planar_coordinate_encoding_method>
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                  <cart:pixel_resolution_x unit="m/pixel">105623.83567219283</cart:pixel_resolution_x>
                  <cart:pixel_resolution_y unit="m/pixel">105623.83567219283</cart:pixel_resolution_y>
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              <cart:Geo_Transformation>
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              </cart:Geo_Transformation>
            </cart:Planar>
            <cart:Geodetic_Model>
              <cart:latitude_type>Planetocentric</cart:latitude_type>
              <cart:spheroid_name>Venus (2015) - Sphere</cart:spheroid_name>
              <cart:a_axis_radius unit="m">6051800</cart:a_axis_radius>
              <cart:b_axis_radius unit="m">6051800</cart:b_axis_radius>
              <cart:c_axis_radius unit="m">6051800</cart:c_axis_radius>
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      <disp:Display_Settings>
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          <disp:horizontal_display_axis>Sample</disp:horizontal_display_axis>
          <disp:horizontal_display_direction>Left to Right</disp:horizontal_display_direction>
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          <disp:vertical_display_direction>Top to Bottom</disp:vertical_display_direction>
        </disp:Display_Direction>
      </disp:Display_Settings>
    </Discipline_Area>
  </Observation_Area>
  <File_Area_Observational>
    <File>
      <file_name>geoid.dat</file_name>
      <creation_date_time>1996-05-31T12:00:00.000</creation_date_time>
      <comment>This file contains a digital
map of Venus geoid derived from radio tracking of the Magellan 
spacecraft. The observation is Venus geoid in meters at the
surface referenced to a sphere of 6051.0 km radius. The map
is produced by the Magellan Gravity Science Team at JPL under
the direction of W.L. Sjogren.</comment>
    </File>
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      <offset unit="byte">0</offset>
      <object_length unit="byte">5760</object_length>
      <parsing_standard_id>PDS3</parsing_standard_id>
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      <offset unit="byte">5760</offset>
      <axes>3</axes>
      <axis_index_order>Last Index Fastest</axis_index_order>
      <description>The Digital Map contains
values of OBSERVATION_TYPE. The values can be obtained
by multiplying the sample in the map by SCALING_FACTOR
and then adding OFFSET. When BANDS is an even number,
the even numbered maps (second, fourth, ..) will be
the error maps (one-sigma uncertainty) for the immediately
preceding odd-numbered maps (first, third, ...). The
uncertainty value can be obtained by multiplying the
sample in the error map by SCALING_FACTOR; the OFFSET
is not used in these cases.
OBSERVATION_TYPE = 'GEOID IN METERS'</description>
      <Element_Array>
        <data_type>IEEE754MSBDouble</data_type>
        <unit>meter</unit>
        <scaling_factor>1.0</scaling_factor>
        <value_offset>0.0</value_offset>
      </Element_Array>
      <Axis_Array>
        <axis_name>Band</axis_name>
        <elements>2</elements>
        <sequence_number>1</sequence_number>
      </Axis_Array>
      <Axis_Array>
        <axis_name>Line</axis_name>
        <elements>180</elements>
        <sequence_number>2</sequence_number>
      </Axis_Array>
      <Axis_Array>
        <axis_name>Sample</axis_name>
        <elements>360</elements>
        <sequence_number>3</sequence_number>
      </Axis_Array>
    </Array_3D_Image>
  </File_Area_Observational>
</Product_Observational>
