<?xml version="1.0" encoding="UTF-8"?>
<?xml-model href="https://pds.nasa.gov/pds4/pds/v1/PDS4_PDS_1I00.sch"  schematypens="http://purl.oclc.org/dsdl/schematron"?>

<Product_Collection xmlns="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_1I00.xsd">

  <Identification_Area>
    <logical_identifier>urn:nasa:pds:grail_gravity_derived:data_shadr</logical_identifier>
    <version_id>2.1</version_id>
    <title>GRAIL Gravity SHADR Collection</title>
    <information_model_version>1.18.0.0</information_model_version>
    <product_class>Product_Collection</product_class>
    <Citation_Information>
      <author_list>Kahan, D.; Lemoine, F. G.; Konopliv, A. S.; Goossens, S.</author_list>
      <publication_year>2022</publication_year>
      <description>
        This collection contains a set of spherical harmonic coeffients of the 
        Lunar gravity field derived from data acquired from the 
        Lunar Gravity Ranging System (LGRS) on the two spacecraft comprising 
        the Gravity Recovery and Interior Laboratory (GRAIL) mission.
      </description>
    </Citation_Information>
    <Modification_History>
      <Modification_Detail>
        <modification_date>2025-05-16</modification_date>
        <version_id>2.1</version_id>
        <description>Minor updates to jggrx_1800f_sha.xml and jggrx_1800f_me_sha.xml</description>
      </Modification_Detail>
      <Modification_Detail>
        <modification_date>2025-03-28</modification_date>
        <version_id>2.0</version_id>
        <description>jggrx_1800f_sha and jggrx_1800f_me_sha added</description>
      </Modification_Detail>
      <Modification_Detail>
        <modification_date>2023-05-24</modification_date>
        <version_id>1.2</version_id>
        <description>Additional minor update to some labels</description>
      </Modification_Detail>
      <Modification_Detail>
        <modification_date>2023-02-01</modification_date>
        <version_id>1.1</version_id>
        <description>Minor update to xml labels</description>
      </Modification_Detail>
      <Modification_Detail>
        <modification_date>2022-08-22</modification_date>
        <version_id>1.0</version_id>
        <description>Initial version</description>
      </Modification_Detail>
    </Modification_History>
  </Identification_Area>
  <Context_Area>
    <Time_Coordinates>
      <start_date_time>2011-09-10Z</start_date_time>
      <stop_date_time>2012-12-18Z</stop_date_time>
    </Time_Coordinates>
    <Primary_Result_Summary>
      <purpose>Science</purpose>
      <processing_level>Derived</processing_level>
      <Science_Facets>
        <domain>Interior</domain>
        <discipline_name>Geosciences</discipline_name>
      </Science_Facets>
    </Primary_Result_Summary>
    <Investigation_Area>
      <name>Gravity Recovery and Interior Laboratory</name>
      <type>Mission</type>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:investigation:mission.gravity_recovery_and_interior_laboratory</lid_reference>
        <reference_type>collection_to_investigation</reference_type>
      </Internal_Reference>
    </Investigation_Area>
    <Observing_System>
      <Observing_System_Component>
        <name>Gravity Recovery and Interior Laboratory A</name>
        <type>Host</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.grail-a</lid_reference>
          <reference_type>is_instrument_host</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
      <Observing_System_Component>
        <name>Gravity Recovery and Interior Laboratory B</name>
        <type>Host</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.grail-b</lid_reference>
          <reference_type>is_instrument_host</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
      <Observing_System_Component>
        <name>Lunar Gravity Ranging System A</name>
        <type>Instrument</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument:grail-a.lgrs-a</lid_reference>
          <reference_type>is_instrument</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
      <Observing_System_Component>
        <name>Lunar Gravity Ranging System B</name>
        <type>Instrument</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument:grail-b.lgrs-b</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:context:resource:resource.grail_gravity_derived_online</lid_reference>
         <reference_type>has_resource</reference_type>
      </Internal_Reference>
  </Reference_List>

  <Collection>
    <collection_type>Data</collection_type>
  </Collection>
  <File_Area_Inventory>
    <File>
      <file_name>collection_data_shadr_inventory.csv</file_name>
    </File>
    <Inventory>
      <local_identifier>inventory</local_identifier>
      <offset unit="byte">0</offset>
      <parsing_standard_id>PDS DSV 1</parsing_standard_id>
      <records>16</records>  
      <record_delimiter>Carriage-Return Line-Feed</record_delimiter>
      <field_delimiter>Comma</field_delimiter>
      <Record_Delimited>
        <fields>2</fields>
        <groups>0</groups>
        <maximum_record_length unit="byte">256</maximum_record_length>
        <Field_Delimited>
          <name>Member Status</name>
          <field_number>1</field_number>
          <data_type>ASCII_String</data_type>
          <maximum_field_length unit="byte">1</maximum_field_length>
          <description>
             This columns specifies the Member Status of the files that comprise the collection.  
          </description>
        </Field_Delimited>
        <Field_Delimited>
          <name>LIDVID_LID</name>
          <field_number>2</field_number>
          <data_type>ASCII_LIDVID_LID</data_type>
          <maximum_field_length unit="byte">255</maximum_field_length>
          <description>
             This columns specifies the LIDVID of the files that comprise the collection.  
          </description>
        </Field_Delimited>
      </Record_Delimited>
      <reference_type>inventory_has_member_product</reference_type>
    </Inventory>
  </File_Area_Inventory>
</Product_Collection>
