urn:nasa:pds:grail_gravity_derived:data_shadr:gggrx_1200l_bouguer_sha 1.1 1.18.0.0 Product_Observational 2023-02-01 1.1 Updated a description in the SHADR Coefficients Table 2022-08-12 1.0 Initial version 2012-03-01Z 2012-12-14Z Gravity Recovery and Interior Laboratory Mission urn:nasa:pds:context:investigation:mission.gravity_recovery_and_interior_laboratory data_to_investigation Gravity Recovery and Interior Laboratory A Host urn:nasa:pds:context:instrument_host:spacecraft.grail-a is_instrument_host Gravity Recovery and Interior Laboratory B Host urn:nasa:pds:context:instrument_host:spacecraft.grail-b is_instrument_host Lunar Gravity Ranging System A for GRAIL-A Instrument urn:nasa:pds:context:instrument:grail-a.lgrs-a is_instrument Lunar Gravity Ranging System B for GRAIL-B Instrument urn:nasa:pds:context:instrument:grail-b.lgrs-b is_instrument Moon Satellite urn:nasa:pds:context:target:satellite.earth.moon data_to_target gggrx_1200l_bouguer_sha.tab 2021-03-16 This file contains coefficients and related data for the GSFC Lunar gravity field GRGM1200L, a degree and order 1199 Spherical Harmonic Model, derived from a series of local gravity solutions. This project was funded by NASA grant NNX15AJ65G. The Bouguer gravity is obtained by differentiating the gravity disturbances due to the lunar topography from the gravity disturbances as measured by the GRGM1200L gravity model. The lunar shape is obtained from the laser altimetry data acquired by the Lunar Orbiter Laser Altimeter (LOLA) onboard the Lunar Reconnaissance Orbiter (LRO), which are available on the NASA PDS Geosciences node. A uniform crustal density of 2550kg/m**3 is assumed. A finite-amplitude correction of the 20th order is used, following WIECZOREK and PHILLIPS, 1998 (JGR, doi:10.1029/97JE03136). The maximum degree of this model is 1199, because the grid spacing to do the spherical harmonic transforms uses 'Lmax+1', and so in order to use a 0.15 degrees by 0.15 degrees grid, we use Lmax=1199. For these Bouguer coefficients, degree 1 terms are also included. No uncertainties are included in this table file. This file is a pair of ASCII tables: a header table and a table of 1439999 coefficients. Definitions of the tables follow. 0 1 The SHADR header includes descriptive information about the spherical harmonic coefficients which follow in SHADR_COEFFICIENTS_TABLE. The header consists of a single record of eight (delimited) data columns requiring 137 bytes, a pad of 105 unspecified ASCII characters, an ASCII carriage-return, and an ASCII line-feed. Carriage-Return Line-Feed 9 0 244 Reference_Raduis 1 1 ASCII_Real 23 Km The assumed reference radius of the spherical planet. Constant 2 25 ASCII_Real 23 For a gravity field model the assumed gravitational constant GM in kilometers cubed per seconds squared for the planet. For a topography model, set to 1. Uncertainty_in_Constant 3 49 ASCII_Real 23 For a gravity field model the uncertainty in the gravitational constant GM in kilometers cubed per seconds squared for the planet. For a topography model, set to 1. Degree_of_Field 4 73 ASCII_Integer 5 The degree of model field. Order_of_Field 5 79 ASCII_Integer 5 The order of the model field. Normalization_State 6 85 ASCII_Integer 5 The normalization indicator. For gravity field: 0 coefficients are unnormalized 1 coefficients are normalized 2 other. Reference_Longitude 7 91 ASCII_Real 23 Degree The reference longitude for the spherical harmonic expansion; normally 0. Reference_Latitude 8 115 ASCII_Real 23 Degree The reference latitude for the spherical harmonic expansion; normally 0. Fill 9 138 ASCII_String 105 SHADR Coefficients Table 244 720599 The SHADR coefficients table contains the coefficients for the Spherical Harmonic Model. Each row in the table contains the degree index m, the order index n, the coefficients Cmn and Smn, and the uncertainties in Cmn and Smn. The (delimited) data require 107 ASCII characters; these are followed by a pad of 13 unspecified ASCII characters, an ASCII carriage- return, and an ASCII line-feed. Carriage-Return Line-Feed 7 0 122 COEFFICIENT DEGREE 1 1 ASCII_Integer 5 The degree index m of the C and S coefficients in this record. COEFFICIENT ORDER 2 7 ASCII_Integer 5 The order index n of the C and S coefficients in this record. C 3 13 ASCII_Real 23 The coefficient Cmn for this spherical harmonic model. S 4 37 ASCII_Real 23 The coefficient Smn for this spherical harmonic model. C_Uncertainty 5 61 ASCII_Real 23 The uncertainty in the coefficient Cmn for this Spherical Harmonic Model. S_Uncertainty 6 85 ASCII_Real 23 The uncertainty in the coefficient Smn for this Spherical Harmonic Model. Fill 7 108 ASCII_String 13 A pad of 13 unspecified ASCII characters. gggrx_1200l_bouguer_sha.lbl 0 PDS3 Original PDS3 label Carriage-Return Line-Feed