PDS_VERSION_ID                = PDS3
RECORD_TYPE                   = STREAM
OBJECT                        = TEXT
  NOTE                        = "Comments on Dual-Polarization Calibrated
                                 Radar Map of the Moon (ERRATA.TXT)"
  PUBLICATION_DATE            = 2012-06-15
END_OBJECT                    = TEXT
END


COMMENTS ON DUAL-POLARIZATION CALIBRATED RADAR MAP OF THE MOON ARCHIVE VOLUME
LRM_90XX:

This document contains comments and errata concerning the Dual-Polarization
Calibrated Radar Map of the Moon Archive Volume LRM_90XX. It is divided into 
sections based on the nature of the errata comments: 1.0 Known Errors 
and Anomalies; 2.0 New File Additions; 3.0 Modifications to Existing Files.
New comments are added at the end of each section as appropriate.

1.0 KNOWN ERRORS AND ANOMALIES
  1.1 DOCUMENT DIRECTORY
    PDS standards specify that the archive should include a plain text
    version of the document LUNAR_RADAR.PDF. However, this version has been
    omitted, because the document contains equations that cannot be rendered
    as ASCII text.

  1.2 MAP PROJECTION INFORMATION IN PDS LABELS
    The file CATALOG/DSMAP_POLAR.CAT gives equations for converting between
    latitude-longitude and line-sample coordinates. The equations do not
    use the map projection parameters LINE_PROJECTION_OFFSET and 
    SAMPLE_PROJECTION_OFFSET, and therefore these parameters are not given
    in the PDS labels for the polar map products (they have the value N/A).
    If you use map projection software that requires these parameters, you
    may compute them as follows:
    
    LINE_PROJECTION_OFFSET = LINES/2 + 0.5
    SAMPLE_PROJECTION_OFFSET = LINE_SAMPLES/2 + 0.5
    
2.0 NEW FILE ADDITIONS
  N/A
  
3.0 MODIFICATIONS TO EXISTING FILES
  3.1 DATA/LEVEL2
    2008-02-20. The file spole_inc_level2.img was accidentally converted to
    double precision in the original archive, so it was twice as large as 
    needed. The file has been replaced.