PDS_VERSION_ID                   = PDS3
LABEL_REVISION_NOTE              = "S. SLAVNEY, 2010-04-21;
                                    A. WHITE, 2020-10-12"
RECORD_TYPE                      = STREAM

OBJECT                           = DATA_SET
 DATA_SET_ID                     = "MGS-M-MOLA-5-SHADR-V1.0"

 OBJECT                          = DATA_SET_INFORMATION
  DATA_SET_NAME                  = "MOLA SPHERICAL HARMONICS TOPOGRAPHY
                                    MODEL"
  DATA_SET_COLLECTION_MEMBER_FLG = "N"
  START_TIME                     = 1997-09-15T19:10:00
  STOP_TIME                      = 1999-12-31T23:59:59
  DATA_OBJECT_TYPE               = TABLE
  DATA_SET_RELEASE_DATE          = 2000-12-31
  PRODUCER_FULL_NAME             = {"DAVID E. SMITH", "MARIA T. ZUBER",
                                    "GREGORY A. NEUMANN"}
  DETAILED_CATALOG_FLAG          = "N"
  DATA_SET_TERSE_DESC            = "Mars Global Surveyor Laser Altimeter 
    Spherical Harmonics ASCII data of Martian topography."
  CITATION_DESC                  = "Smith, D.E., M.T. Zuber, G.A. Neumann, 
     Mars Global Surveyor Laser Altimeter Spherical Harmonics ASCII Data 
     Record, MGS-M-MOLA-5-SHADR-V1.0, NASA Planetary Data System, 2003."
  ABSTRACT_DESC                  = "The MOLA Spherical Harmonics 
     Topography Model (SHADR) is a numerical transform of planetary radius 
     values from the MOLA gridded data set (EGDR) into spherical harmonics 
     using Simpson's  Rule quadrature. When evaluated, the model gives 
     absolute radius from Mars' center of mass in meters."
  DATA_SET_DESC                  = "


  Data Set Overview
  =================
  The Mars Global Surveyor spacecraft includes a laser altimeter
  instrument. The primary objective of the Mars Orbiter Laser
  Altimeter (MOLA) is to determine globally the topography of Mars at
  a level suitable for addressing problems in geology and geophysics.

  This file contains coefficients and related data for a spherical 
  harmonic model of the shape of Mars.  Input data are from the Mars
  Orbiter Laser Altimeter (MOLA) on the Mars Global Surveyor (MGS)
  spacecraft.  Coordinate system is IAU 1991 (Davies et al., 
  Celestial Mechanics and Dynamical Astronomy, 53, 377-397, 1992),
  areocentric, with longitudes measured positive east.  When 
  evaluated, the model gives absolute radius from Mars center of
  mass in meters.
 
  The model is a numerical transform of planetary radius values
  from the MOLA 0.5-degree gridded data set        
            DATA_SET_ID = 'MGS-M-MOLA-5-IEGDR-L3-V2.0'
            PRODUCT_ID  = 'MOLA-IEG0062R.IMG'
  into spherical harmonics using Simpson's Rule quadrature.
 
  The gridded data set included all MOLA nadir observations from the
  Orbit Insertion phase, plus Mapping Phase nadir observations from
  the beginning of mapping through the end of December 1999. 
  Additionally, off-nadir observations of the north pole were
  included from 87 N latitude and northward, taken during the spring
  of 1998, and of both poles taken in July of 1999, from 87 N and S 
  to the poles.  Orbits 355 and 358 of the Orbit Insertion Phase 
  and parts of orbits 10709 through 10716, inclusive, of the Mapping
  Phase were excluded because solutions for these orbits were deemed
  to be poor. (Note: subtract 10000 from a MOLA mapping phase orbit 
  number to determine the equivalent MGS Project orbit number.) 
  Also excluded were shots more than 1 degree off-nadir except as 
  noted above), channel 4 returns, and any returns not classified 
  as ground returns, e.g. clouds or noise, according to the
  SHOT_CLASSIFICATION_CODE. A total of approximately 123 million
  observations are represented.
 
  Further improvements to the model are expected as additional MGS 
  data are incorporated.                       
  
  This product is a set of two ASCII tables: a header table and a 
  coefficients table.  Definitions of the tables follow.    
 
  This Mars topography model was produced under the direction of 
  D.E. Smith of the MGS MOLA Team."                

  CONFIDENCE_LEVEL_NOTE           = "
  None."

 END_OBJECT                      = DATA_SET_INFORMATION

 OBJECT                          = DATA_SET_TARGET
  TARGET_NAME                    = MARS
 END_OBJECT                      = DATA_SET_TARGET

 OBJECT                          = DATA_SET_HOST
  INSTRUMENT_HOST_ID             = MGS
  INSTRUMENT_ID                  = MOLA
 END_OBJECT                      = DATA_SET_HOST

 OBJECT                          = DATA_SET_MISSION
  MISSION_NAME                   = "MARS GLOBAL SURVEYOR"
 END_OBJECT                      = DATA_SET_MISSION

 OBJECT                          = DATA_SET_REFERENCE_INFORMATION
  REFERENCE_KEY_ID               = "ABSHIREETAL2000"
 END_OBJECT                      = DATA_SET_REFERENCE_INFORMATION
 
 OBJECT                          = DATA_SET_REFERENCE_INFORMATION
  REFERENCE_KEY_ID               = "AFZALETAL1997"
 END_OBJECT                      = DATA_SET_REFERENCE_INFORMATION

 OBJECT                          = DATA_SET_REFERENCE_INFORMATION
  REFERENCE_KEY_ID               = "DAVIESETAL1994B"
 END_OBJECT                      = DATA_SET_REFERENCE_INFORMATION

 OBJECT                          = DATA_SET_REFERENCE_INFORMATION
  REFERENCE_KEY_ID               = "MOLAEGDRSIS1999"
 END_OBJECT                      = DATA_SET_REFERENCE_INFORMATION

 OBJECT                          = DATA_SET_REFERENCE_INFORMATION
  REFERENCE_KEY_ID               = "MOLAPEDRSIS1998"
 END_OBJECT                      = DATA_SET_REFERENCE_INFORMATION
 
 OBJECT                          = DATA_SET_REFERENCE_INFORMATION
  REFERENCE_KEY_ID               = "SMITHETAL1998"
 END_OBJECT                      = DATA_SET_REFERENCE_INFORMATION

 OBJECT                          = DATA_SET_REFERENCE_INFORMATION
  REFERENCE_KEY_ID               = "ZUBERETAL1992"
 END_OBJECT                      = DATA_SET_REFERENCE_INFORMATION

END_OBJECT                       = DATA_SET

END