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Data Set Information
DATA_SET_NAME LRO MOON LASER ALTIMETER 5 SHADR V1.0
DATA_SET_ID LRO-L-LOLA-5-SHADR-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : Topographic spherical harmonic coefficients are derived from gridded altimetry products via a numerical transform. The data are in the form of tables with a detached label. The Reduced Data Record Software Interface Specification describes the values input to the harmonic transform. The discrete-Fourier-transformed topography coefficients H_j(m) at latitude index, times the associated Legendre polynomial P_lm, times a weight proportional to the area associated with a given latitude interval, are summed over all latitudes to yield the complex coefficient (C_lm,S_lm). The weights are normalized so that a coefficient of unit magnitude represents a harmonic whose squared amplitude integrated with respect to area over a unit sphere is 4 pi.
DATA_SET_RELEASE_DATE 2011-03-15T00:00:00.000Z
START_TIME 2009-07-03T12:00:00.000Z
STOP_TIME 2011-08-10T04:36:55.073Z
MISSION_NAME LUNAR RECONNAISSANCE ORBITER
MISSION_START_DATE 2009-06-18T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME MOON
TARGET_TYPE SATELLITE
INSTRUMENT_HOST_ID LRO
INSTRUMENT_NAME LUNAR ORBITER LASER ALTIMETER
INSTRUMENT_ID LOLA
INSTRUMENT_TYPE LASER ALTIMETER
NODE_NAME Geosciences
ARCHIVE_STATUS
CONFIDENCE_LEVEL_NOTE Overview : Data are edited and selected before averaging so as to maintain good quality. Where necessary, crossover analysis is done prior to averaging so as to minimize discrepancies between individual tracks. Data Coverage and Quality : Each nominal monthly orbit provides roughly two tracks per degree of longitude at the equator. After each month's data are accumulated, crossover adjustments are made to minimize the difference in elevation between closely registered tracks and to remove along- and across-track orbital errors. The resulting dataset provides better geodetic control than that from individual tracks. The first release (March 15, 2010) does not incorporate these adjustments, and relies on preliminary trajectory solutions. Re-release with better precision and increased density will occur periodically. The current release does not include a gravity potential model. Limitations : Density of observations increases linearly with time. Higher-resolution SHADR products will be provided when data density provides coverage in a majority of pixels of each data product.
CITATION_DESCRIPTION Neumann, G.A., 2009, Lunar Orbiter Laser Altimeter Spherical Harmonic Model, LRO-L-LOLA-5-SHADR-V1.0, NASA Planetary Data System, 2009.
ABSTRACT_TEXT This data set contains spherical harmonic topographic (shape) and gravity potential models from the Lunar Orbiter Laser Altimeter instrument, LRO Laser Ranging, and radio tracking.
PRODUCER_FULL_NAME GREGORY A. NEUMANN
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