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<?xml-model href="https://pds.nasa.gov/pds4/pds/v1/PDS4_PDS_1N00.sch" schematypens="http://purl.oclc.org/dsdl/schematron"?>

<Product_Ancillary xmlns="http://pds.nasa.gov/pds4/pds/v1" 
  xmlns:pds="http://pds.nasa.gov/pds4/pds/v1" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://pds.nasa.gov/pds4/pds/v1 https://pds.nasa.gov/pds4/pds/v1/PDS4_PDS_1N00.xsd">
  
  <Identification_Area>
    <logical_identifier>urn:nasa:pds:mgs_mola_topography_derived:miscellaneous_index:index</logical_identifier>
    <version_id>1.0</version_id>
    <title>MGS MOLA Derived Topography - MEGDR PDS3 Index Table</title>
    <information_model_version>1.23.0.0</information_model_version>
    <product_class>Product_Ancillary</product_class>
    <Citation_Information>
      <publication_year>2026</publication_year>
      <description>This index file lists information about
        MOLA MEGDR data products in this archive.</description>
      <List_Author>
        <Person>
          <contributor_type>Producer</contributor_type>
          <given_name>David E.</given_name>
          <family_name>Smith</family_name>
          <Affiliation>
            <organization_name>Goddard Space Flight Center, MOLA Team</organization_name>
          </Affiliation>
        </Person>
        <Person>
          <contributor_type>Producer</contributor_type>
          <given_name>Greg</given_name>
          <family_name>Neumann</family_name>
          <Affiliation>
            <organization_name>Goddard Space Flight Center, MOLA Team</organization_name>
          </Affiliation>
        </Person>
        <Person>
          <contributor_type>DataCurator</contributor_type>
          <given_name>Madison N.</given_name>
          <family_name>Hughes</family_name>
          <Affiliation>
            <organization_name>Washington University in St. Louis</organization_name>
          </Affiliation>
        </Person>
      </List_Author>
    </Citation_Information>
    <Modification_History>
      <Modification_Detail>
        <modification_date>2026-08-25</modification_date>
        <version_id>1.0</version_id>
        <description>Initial PDS4 version</description>
      </Modification_Detail>
    </Modification_History>
  </Identification_Area>
<Context_Area>
  <Investigation_Area>
    <name>Mars Global Surveyor</name>
    <type>Mission</type>
    <Internal_Reference>
      <lid_reference>urn:nasa:pds:context:investigation:mission.mars_global_surveyor</lid_reference>
      <reference_type>ancillary_to_investigation</reference_type>
    </Internal_Reference>
  </Investigation_Area>
  <Observing_System>
    <name>MOLA</name>
    <Observing_System_Component>
      <name>The Mars Global Surveyor Spacecraft</name>
      <type>Host</type>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.mgs</lid_reference>
        <reference_type>is_instrument_host</reference_type>
      </Internal_Reference>
    </Observing_System_Component>
    <Observing_System_Component>
      <name>MARS ORBITER LASER ALTIMETER</name>
      <type>Instrument</type>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:instrument:mgs.mola</lid_reference>
        <reference_type>is_instrument</reference_type>
      </Internal_Reference>
    </Observing_System_Component>
  </Observing_System>
  <Target_Identification>
    <name>Mars</name>
    <type>Planet</type>
    <Internal_Reference>
      <lid_reference>urn:nasa:pds:context:target:planet.mars</lid_reference>
      <reference_type>ancillary_to_target</reference_type>
    </Internal_Reference>
  </Target_Identification>
</Context_Area>
  <File_Area_Ancillary>
    <File>
      <file_name>index.tab</file_name>
    </File>
    <Table_Character>
      <offset unit="byte">0</offset>
      <records>89</records>
      <record_delimiter>Carriage-Return Line-Feed</record_delimiter>
      <Record_Character>
        <fields>15</fields>
        <groups>0</groups>
        <record_length unit="byte">156</record_length>
        <Field_Character>
          <name>VOLUME_ID</name>
          <field_number>1</field_number>
          <field_location unit="byte">2</field_location>
          <data_type>ASCII_String</data_type>
          <field_length unit="byte">9</field_length>
          <description>The volume on which a data product
            is stored.</description>
        </Field_Character>
        <Field_Character>
          <name>FILE_SPECIFICATION_NAME</name>
          <field_number>2</field_number>
          <field_location unit="byte">14</field_location>
          <data_type>ASCII_String</data_type>
          <field_length unit="byte">23</field_length>
          <description>The directory path and file name 
            of the product label, relative to the root directory.</description>
        </Field_Character>
        <Field_Character>
          <name>PRODUCT_ID</name>
          <field_number>3</field_number>
          <field_location unit="byte">40</field_location>
          <data_type>ASCII_String</data_type>
          <field_length unit="byte">16</field_length>
          <description>The unique identifier for a MEGDR
            product.</description>
        </Field_Character>
        <Field_Character>
          <name>MAP_TYPE</name>
          <field_number>4</field_number>
          <field_location unit="byte">59</field_location>
          <data_type>ASCII_String</data_type>
          <field_length unit="byte">17</field_length>
          <description>The type of data shown in the map. 
            Possible values are MEDIAN_TOPOGRAPHY, MEAN_RADIUS, 
            AREOID_RADIUS, and COUNTS_PER_BIN.</description>
        </Field_Character>
        <Field_Character>
          <name>PRODUCT_VERSION_ID</name>
          <field_number>5</field_number>
          <field_location unit="byte">79</field_location>
          <data_type>ASCII_String</data_type>
          <field_length unit="byte">3</field_length>
          <description>The product version number is
            incremented when a product is revised.</description>
        </Field_Character>
        <Field_Character>
          <name>PRODUCT_CREATION_TIME</name>
          <field_number>6</field_number>
          <field_location unit="byte">84</field_location>
          <data_type>ASCII_Date_Time_YMD</data_type>
          <field_length unit="byte">19</field_length>
          <description>Date and time of product
            generation.</description>
        </Field_Character>
        <Field_Character>
          <name>MAXIMUM_LATITUDE</name>
          <field_number>7</field_number>
          <field_location unit="byte">104</field_location>
          <data_type>ASCII_Real</data_type>
          <field_length unit="byte">5</field_length>
          <unit>degree</unit>
          <description>Areocentric latitude of northernmost 
            point in the image.</description>
        </Field_Character>
        <Field_Character>
          <name>MINIMUM_LATITUDE</name>
          <field_number>8</field_number>
          <field_location unit="byte">110</field_location>
          <data_type>ASCII_Real</data_type>
          <field_length unit="byte">5</field_length>
          <unit>degree</unit>
          <description>Areocentric latitude of southernmost
            point in the image.</description>
        </Field_Character>
        <Field_Character>
          <name>WESTERNMOST_LONGITUDE</name>
          <field_number>9</field_number>
          <field_location unit="byte">116</field_location>
          <data_type>ASCII_Real</data_type>
          <field_length unit="byte">5</field_length>
          <unit>degree</unit>
          <description>Areocentric longitude of westernmost
            point in the image. Longitudes increase toward the east.</description>
        </Field_Character>
        <Field_Character>
          <name>EASTERNMOST_LONGITUDE</name>
          <field_number>10</field_number>
          <field_location unit="byte">122</field_location>
          <data_type>ASCII_Real</data_type>
          <field_length unit="byte">5</field_length>
          <unit>degree</unit>
          <description>Areocentric longitude of easternmost
            point in the image. Longitudes increase toward the east.</description>
        </Field_Character>
        <Field_Character>
          <name>MAP_RESOLUTION</name>
          <field_number>11</field_number>
          <field_location unit="byte">128</field_location>
          <data_type>ASCII_Real</data_type>
          <field_length unit="byte">5</field_length>
          <unit>pixel/degree</unit>
          <description>Resolution of the map in pixels per 
            degree.</description>
        </Field_Character>
        <Field_Character>
          <name>MAP_SCALE</name>
          <field_number>12</field_number>
          <field_location unit="byte">134</field_location>
          <data_type>ASCII_Real</data_type>
          <field_length unit="byte">6</field_length>
          <unit>km/pixel</unit>
          <description>Scale of the map in kilometers per pixel.</description>
        </Field_Character>
        <Field_Character>
          <name>LINES</name>
          <field_number>13</field_number>
          <field_location unit="byte">141</field_location>
          <data_type>ASCII_Integer</data_type>
          <field_length unit="byte">5</field_length>         
          <description>Number of lines in the image.</description>
        </Field_Character>
        <Field_Character>
          <name>LINE_SAMPLES</name>
          <field_number>14</field_number>
          <field_location unit="byte">147</field_location>
          <data_type>ASCII_Integer</data_type>
          <field_length unit="byte">5</field_length>         
          <description>Number of samples (pixels) per image line.</description>
        </Field_Character>
        <Field_Character>
          <name>SAMPLE_BITS</name>
          <field_number>15</field_number>
          <field_location unit="byte">153</field_location>
          <data_type>ASCII_Integer</data_type>
          <field_length unit="byte">2</field_length>         
          <description>Number of bits per pixel in the image.</description>
        </Field_Character>
      </Record_Character>
    </Table_Character>
  </File_Area_Ancillary>
</Product_Ancillary>
