PDS_VERSION_ID                   = "PDS3"

RECORD_TYPE                      = FIXED_LENGTH
RECORD_BYTES                     = 84
FILE_RECORDS                     = 72548
^TABLE                           = "GLTM2BPR.TAB"

SPACECRAFT_NAME                  = "CLEMENTINE 1"
TARGET_NAME                      = "MOON"
INSTRUMENT_NAME                  = "LIDAR"
DATA_SET_ID                      = "CLEM1-L-LIDAR-5-TOPO-V1.0"
PRODUCT_ID                       = "GLTM2B-PRO"
PRODUCT_RELEASE_DATE             = 1996-01-01
DESCRIPTION                      = "This file contains
topographic profiles and related data along each observational
pass during which LIDAR laser range data were acquired.  The data
were created using the final spacecraft orientation and orbital
solutions.  The laser ranges are believed to be correct, but
there may be unresolvable ambiguities due to noise."

START_REVOLUTION_NUMBER          = 20
STOP_REVOLUTION_NUMBER           = 332

OBJECT                       = TABLE
  ROWS                           = 72548
  COLUMNS                        = 9
  ROW_BYTES                      = 84
  INTERCHANGE_FORMAT             = ASCII
  DESCRIPTION                    = "The GLTM-2B profiles table
  contains the laser ranges and related data for each orbit
  profile. Each row in the table contains the date/times,
  positions of laser bounce points, relative elevations,
  revolution number, and trigger bins. The (delimited) data
  require 80 ASCII characters; these are followed by a pad of 2
  unspecified ASCII characters, an ASCII carriage-return, and an
  ASCII line-feed."

  OBJECT                     = COLUMN
    NAME                         = "UNIVERSAL TIME"
    DATA_TYPE                    = TIME
    START_BYTE                   = 1
    BYTES                        = 23
    FORMAT                       = "N/A"
    UNIT                         = "N/A"
    DESCRIPTION                  = "The date and time of the
    laser fire, in Universal Time Coordinates (UTC), for that
    point in the orbit."
  END_OBJECT                 = COLUMN

  OBJECT                     = COLUMN
    NAME                         = "LONGITUDE"
    DATA_TYPE                    = ASCII_REAL
    START_BYTE                   = 25
    BYTES                        = 9
    FORMAT                       = "F9.4"
    UNIT                         = "DEGREE"
    POSITIVE_LONGITUDE_DIRECTION = "EAST"
    DESCRIPTION                  = "The longitude of the laser
    bounce point, in IAU body-fixed coordinates."
  END_OBJECT                 = COLUMN

  OBJECT                     = COLUMN
    NAME                         = "LATITUDE"
    DATA_TYPE                    = ASCII_REAL
    START_BYTE                   = 35
    BYTES                        = 9
    FORMAT                       = "F9.4"
    UNIT                         = "DEGREE"
    DESCRIPTION                  = "The latitude of the laser
    bounce point, in IAU body-fixed coordinates."
  END_OBJECT                 = COLUMN

  OBJECT                     = COLUMN
    NAME                         = "ELEVATION"
    DATA_TYPE                    = ASCII_REAL
    START_BYTE                   = 45
    BYTES                        = 8
    FORMAT                       = "F8.1"
    UNIT                         = "METER"
    DESCRIPTION                  = "The elevation in meters above
    a spheroid of radius 1738 km at the equator, with a
    flattening of 1/3234.93 corresponding to the flattening of
    the geoid."
  END_OBJECT                 = COLUMN

  OBJECT                     = COLUMN
    NAME                         = "RELATIVE ELEVATION"
    DATA_TYPE                    = ASCII_REAL
    START_BYTE                   = 54
    BYTES                        = 8
    FORMAT                       = "F8.1"
    UNIT                         = "METER"
    DESCRIPTION                  = "The elevation in meters
    relative to a 1738 km radius sphere."
  END_OBJECT                 = COLUMN

  OBJECT                     = COLUMN
    NAME                         = "REVOLUTION NUMBER"
    DATA_TYPE                    = ASCII_INTEGER
    START_BYTE                   = 63
    BYTES                        = 4
    FORMAT                       = "I4"
    UNIT                         = "N/A"
    DESCRIPTION                  = "The revolution during which
    data were acquired for that point.  The revolutions included
    are from 20-332.  Ranges acquired on calibration passes 8-19
    were discarded as too noisy."
  END_OBJECT                 = COLUMN

  OBJECT                     = COLUMN
    NAME                         = "BIN"
    DATA_TYPE                    = ASCII_INTEGER
    START_BYTE                   = 68
    BYTES                        = 2
    FORMAT                       = "I2"
    UNIT                         = "N/A"
    DESCRIPTION                  = "A number designating whether
    the data are the result of a trigger before (0), inside
    (1-4), or after (5) the range window.  The lidar
    electronics triggered on photon pulses continuously, and
    recorded up to four pulses within a programmable range
    window.  The last trigger before and the first trigger after
    the range window were also recorded.  Usually, but not
    always, the first trigger within the range window was the
    valid range.  For some laser shots, multiple pulses were
    detected within the expected time interval for lunar
    reflections.  At most one of these pulses is designated valid
    in this archive."
  END_OBJECT                 = COLUMN

  OBJECT                     = COLUMN
    NAME                         = "NEW BIN"
    DATA_TYPE                    = ASCII_INTEGER
    START_BYTE                   = 71
    BYTES                        = 2
    FORMAT                       = "I2"
    UNIT                         = "N/A"
    DESCRIPTION                  = "Many triggers occurred due to
    noise in the electronics and could not possibly have resulted
    from lunar surface reflections.  Those triggers that could
    have resulted from topography within a +/- 12 km distance
    from the reference lunar spheroid (see elevations, column 4)
    were assigned bins from 1 to 4.  These bins were used as
    weights in the filtering procedure (Smith et al., The
    Topography of the Moon from the Clementine LIDAR, submitted
    to Journal of Geophysical Research, 1995).  These weights
    corresponded to a value of sigma = NEWBIN * (1 km), for each
    trigger.  The filter iteratively estimates the topography,
    with an a priori covariance function given by
    cov(R) = (5 km)^2 * exp(-R/170), where R is distance in km
    between any two points on the Moon.  The filter passes ranges
    within 2.0 sigma of the predicted range."
  END_OBJECT                 = COLUMN

  OBJECT                     = COLUMN
    NAME                         = "NADIR ANGLE"
    DATA_TYPE                    = ASCII_REAL
    START_BYTE                   = 74
    BYTES                        = 7
    FORMAT                       = "F7.3"
    UNIT                         = "DEGREE"
    DESCRIPTION                  = "The angle off nadir,
    calculated from spacecraft quaternion data using star
    tracking.  A number of passes were intentionally pointed
    off-nadir in order to cover previously skipped regions, and
    in some cases spacecraft commands inadvertently resulted in
    off-nadir pointing.  Where quaternion data were missing, the
    interpolation software generated spurious angles, but the
    lidar is assumed to be nominally nadir-pointing, as the
    ranges appear valid.  Angles greater than 15 degrees
    correspond to missing quaternion data."
  END_OBJECT                 = COLUMN

END_OBJECT                   = TABLE

END