PDS_VERSION_ID                  = PDS3 

RECORD_TYPE                     = STREAM
INSTRUMENT_HOST_NAME            = "LUNAR PROSPECTOR"
TARGET_NAME                     = MOON
OBJECT                          = TEXT
  PUBLICATION_DATE              = 2012-10-24
  NOTE                          = "LUNAR PROSPECTOR GRS ELEMENTAL
                                   ABUNDANCE ARCHIVE"
END_OBJECT                      = TEXT
END


    LUNAR PROSPECTOR GRS ELEMENTAL ABUNDANCE ARCHIVE

1.  Introduction

This data set provides tables of weight fractions and terms of the error
matrix for major oxides and K, Th, and U for the Moon from Lunar
Prospector Gamma Ray and Neutron Spectrometer data acquired at high
altitude (100 km) and binned on 2, 5, or 20 degree equal area pixels.
The table contains the original elemental abundances reported by   
PRETTYMANETAL2006. The abundances were determined by gamma ray spectral 
unmixing.


2.  File Formats

The data files are ASCII tables corresponding to bin sizes of 2, 5, 
and 20 degree pixels. Each table is described by a detached PDS label with 
the same file name but with the extension ".LBL".

ASCII tables (file names ending in "*.TAB") have fixed-length rows, with 
columns separated by commas. Character fields are enclosed in double 
quotation marks ("). Character fields are left justified, and numeric fields 
are right justified.  The "start byte" and "bytes" values listed for each 
column in file's PDS label do not include the commas between fields or the 
quotation marks surrounding character fields.  The last two bytes of each 
row contain the carriage return (ASCII 13) and line feed (ASCII 10) 
characters.  This allows the table to be viewed easily on various computer 
operating systems.

Files with names ending in ".TXT" and ".CAT" are also ASCII text files and
can be opened in a text editor. These files are stream format with a 
carriage return and line feed at the end of each line. 

PDS labels (file names ending in "*.LBL") are ASCII text files that can be
opened in a text editor. They are written using KEYWORD = VALUE statements
that are both human-readable and software-readable. A PDS label gives 
specific information about a data file and describes the file's storage 
format. In this archive all data files have the same tabular format, which 
is described in the format file LPGRS-ELEM-ABUNDANCE.FMT. Each PDS label 
refers to this format file with the statement
^STRUCTURE = "LPGRS_ELEM_ABUNDANCE.FMT". 

3.  Archive Contents

The files in this archive are organized in one top-level directory
with several subdirectories.  The following diagram shows the structure
and content of these directories.  In the diagram, directory names are
enclosed in square brackets ([]), upper-case letters indicate an
actual directory or file name, and lower-case letters indicate the
general form of a set of directory or file names.

 
   FILE                   CONTENTS

Top-level directory
    |
    |- AAREADME.TXT       The file you are reading.
    |
    |- VOLDESC.CAT        A description of the archive contents; essentially
    |                     a PDS label for the archive as a whole.
    |
    |- [BROWSE]           A directory containing Adobe PDF documents 
    |                     showing quick-look images of the files in the
    |                     DATA directory.
    |
    |- [CATALOG]          A directory containing PDS catalog files,
    |   |                 and information about the datasets. 
    |   |
    |   |- CATINFO.TXT    Description of files in the CATALOG
    |   |                 directory.
    |   |
    |   |- DATASET.CAT    A description of the Elemental Abundance data set.
    |   |
    |   |- GRSINST.CAT    A description of the GRS instrument.
    |   |
    |   |- LPHOST.CAT     A description of the Lunar Prospector spacecraft.
    |   |
    |   |- MISSION.CAT    A description of the Lunar Prospector mission.
    |   |                 It includes a chronology of events, definition
    |   |                 of mission phases, and science objectives.
    |   |
    |   |- NSINST.CAT     A description of the NS instrument.
    |   |
    |   |- REF.CAT        A listing of references used in the catalog files.
    |   |
    |   |- PERSON.CAT     A listing of key people involved in
    |                     generating and processing the archival dataset.
    | 
    |- [DATA]             
    |    |                
    |    |- *.TAB, *.LBL  The elemental abundance data files and their PDS
    |    |                 labels are in this directory.
    |    |
    |    |- LPGRS_ELEM_ABUNDANCE.FMT   This format file describes the columns
    |                                 in the elemental abundance tables.
    |
    |- [INDEX]            A directory containing index files 
        |                 relating to this archive.
        |
        |- INDEX.LBL      A PDS detached label describing INDEX.TAB
        |
        |- INDEX.TAB      A tabular summary of the data files in this
        |                 archive.
        |
        |- INDXINFO.TXT   A description of the files in the INDEX
                          directory.
    

4.  Whom to Contact for Information
    
    For questions concerning this archive, associated PDS labels
    and documentation:
                                   
              Susan Slavney
              PDS Geosciences Node
              Washington University
              1 Brookings Drive
              Campus Box 1169
              St. Louis, MO 63130
              314-935-9295
              Susan.Slavney@wustl.edu


    For questions concerning the generation of the elemental abundance
    data products:
    
              Thomas H. Prettyman
              Planetary Science Institute
              1700 East Fort Lowell
              Suite 106
              Tucson, AZ 85719
              505-690-5128
              Prettyman@psi.edu