LP RSS Gravity Data

GRAGOD – Goddard Gravity Data

GRAJPL – JPL Gravity Data

Instrument: Radio Science Subsystem

PDS Geosciences Node:PDS Source Information

LP PDS3 to PDS4 Migration Status: Complete

Type	Description	PDS4 Bundle	More information
GRAJPL	JPL gravity data contain spherical harmonic data of the lunar gravity field and digital gravity maps.  There are three data types for the gravity products:  tabular, array, and image data. The files containing the spherical harmonic coefficients of the Moon’s gravity field are in tabular format, with each row in the table containing the degree index m, the order index n, the coefficients Cmn and Smn, and the uncertainties in Cmn and Smn. The gridded digital maps (at 1 degree resolution) of Free-air gravity anomalies, Free-air gravity errors, Bouguer anomalies, Geoid anomalies, and Geoid anomaly errors are 64-bit binary images.  There are also gridded ASCII 2D data arrays of each of the digital maps, and byte-scaled images of each of the gridded products.	urn:nasa:pds:lp_rs_jpl_gravity_derived	about RSS GRAJPL products, see the Data Set Catalog File. about digital map products, see the RSDMAP Data Product SIS. about SHADR products, see the SHADR Data Product SIS. about SHBDR products, see the SHBDR Data Product SIS. DOI: 10.17189/1519386
GRAGOD	Goddard gravity data consist of the Spherical Harmonics ASCII Data Record (SHADR) and the Spherical Harmonics Binary Data Record (SHBDR). The files containing the spherical harmonic coefficients of the Moon's gravity field (GLGM3150, LPE200) are in tabular (ASCII) and array (BINARY) format, with each row in the table containing the degree index m, the order index n, the coefficients Cmn and Smn, and the uncertainties in Cmn and Smn. The binary array file is a little-endian, row ordered upper triangular matrix.	urn:nasa:pds:lp_rs_goddard_gravity_derived	about RSS GRAGOD products, see the Data Set Catalog File. about SHADR products, see the SHADR Data Product SIS. about SHBDR products, see the SHBDR Data Product SIS. DOI: 10.17189/1519387

RSS Derived GRAJPL products have the following file names:

Jttnnnvv.xxx (with detached PDS labels for each product)

where:

tt = type of data represented

BL = Bouguer anomalies

GL = free air gravity field

GU = free air gravity field errors

OL = geoid anomalies

OU = geoid anomaly errors

nnn = degree and order of gravitational model

vv = version identifier

xxx = file extension

IMG = digital map

DAT = ASCII data

SHA = spherical harmonic data, in ASCII

SHB = spherical harmonic data, in binary

RSS Derived GRAGOD products have the following file names:

gglp_sssssmmm_sh*.xxx (with detached PDS labels for each product)

where:

sssss = type of model used for data processing

glgm3 = GLGM-3 spherical harmonic model

lpe = LPE200 gravity model

mmm = 150, 200 or null (complete to 150x150 or 200x200, default of null value is 150x150)

* = data type

A = spherical harmonic data, in ASCII

B = spherical harmonic data, in binary

xxx = file extension

TAB = ASCII table

DAT= Binary tables

In ODE, GRAJPL products have the following product IDs:

JTTNNNVV.XXX

GRAGOD products have the following product IDs:

GGLP_GLGM3_SHB

GGLP_GLGM3150_SHA

GGLP_LPE200_SHA

More information about the RSS GLGM-3 model and LPE200 model can be found in below papers:

• Mazarico, E., F.G. Lemoine, Shin-Chan Han, and D.E. Smith, GLGM-3: A degree-150 lunar gravity model from the historical tracking data of NASA Moon orbiters, J. Geophys. Res., 115, E05-001, 14 PP., 2010.

• Han, S.-C., E. Mazarico, D. Rowlands, F. Lemoine, S. Goossens, New analysis of Lunar Prospector radio tracking data brings the nearside gravity field of the Moon with an unprecedented resolution, Icarus, 215, 455-459, doi:10.1016/j.icarus.2011.07.020, 2011.