<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<?xml-model href="https://pds.nasa.gov/pds4/pds/v1/PDS4_PDS_1E00.sch" schematypens="http://purl.oclc.org/dsdl/schematron"?>

<Product_Observational 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_1E00.xsd">
  <Identification_Area>
    <logical_identifier>urn:nasa:pds:lp_rs_jpl_gravity_derived:data_ascii:jgu100j1_ascii</logical_identifier>
    <version_id>1.0</version_id>
    <title>Lunar Prospector Gravity File: jgu100j1_ascii</title>
    <information_model_version>1.14.0.0</information_model_version>
    <product_class>Product_Observational</product_class>
    <Modification_History>
      <Modification_Detail>
        <modification_date>2021-01-14</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 xsi:nil="true" nilReason="missing"></start_date_time>
      <stop_date_time xsi:nil="true" nilReason="missing"></stop_date_time>
    </Time_Coordinates>
    <Investigation_Area>
      <name>Lunar Prospector</name>
      <type>Mission</type>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:investigation:mission.lunar_prospector</lid_reference>
        <reference_type>data_to_investigation</reference_type>
      </Internal_Reference>
    </Investigation_Area>
    <Observing_System>
      <Observing_System_Component>
        <name>Lunar Prospector</name>
        <type>Host</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.lp</lid_reference>
          <reference_type>is_instrument_host</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
      <Observing_System_Component>
        <name>Radio Science Subsystem</name>
        <type>Instrument</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument:lp.rss</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>data_to_target</reference_type>
      </Internal_Reference>
    </Target_Identification>
  </Observation_Area>
  <Reference_List>
    <Internal_Reference>
      <lid_reference>urn:nasa:pds:lp_rs_jpl_gravity_derived:data_image:jgu100j1_img</lid_reference>
      <reference_type>data_to_associate</reference_type>
    </Internal_Reference>
  </Reference_List>

  <File_Area_Observational>
    <File>
      <file_name>jgu100j1.dat</file_name>
      <comment>
        This file contains a digital,
        1 X 1 degree resolution grid of the errors in the vertical gravity
        accelerations of the moon.  It is a 360 x 180 grid from 89.5 to -89.5
        degrees latitude, and -180.0 to 179.0 degrees longitude. The errors were
        computed by projecting the full covariance of the JGL075D gravity
        solution onto the surface of the satellite. The observation is vertical
        gravity acceleration uncertainty in milligals at the surface referenced
        to a sphere of 1738.0 km radius.
        
        This is a 2-D grid of the errors in the
        vertical gravity accelerations of the Moon in milligals
        (1 milligal = 0.01 mm/s/s). The file contains 180 blocks of 36 records,
        with each record containing 10 vertical gravity error values plus an ASCII
        carriage-return line-feed pair as a delimiter. The first block contains
        values at 89.5N latitude; the first value in the first record is the
        error in the vertical gravity acceleration at (89.5N, 180.0W).
      </comment>
    </File>
    
    <Stream_Text>
      <offset unit="byte">0</offset>
      <parsing_standard_id>7-Bit ASCII Text</parsing_standard_id>
      <record_delimiter>Carriage-Return Line-Feed</record_delimiter>
    </Stream_Text>
  </File_Area_Observational>

  <File_Area_Observational_Supplemental>
    <File>
      <file_name>jgu100j1.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>
