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Home » About » MISSIONS » GRACE

GRACE Documentation

General Documentation
GRACE Product Specification Document
GRACE 327-720

Revision: 4.6
Author: S. Bettadpur
Date: May 29, 2012

Provides a detailed description of data products at all levels for the GRACE mission.
Level 1B Documentation
GRACE Level 1B Data Product User Handbook JPL D-22027
GRACE 327-733

Revision: 1.3
Authors: K. Case, G. Kruizinga, and S.C. Wu
Date: March 24, 2010

Provides a comprehensive description of the content and format of the Level 1B data.
AOD1B Product Description Document
GRACE 327-750

Revision: 6.1
Author: Henryk Dobslaw, Inga Bergmann-Wolf, Robert Dill, Lea Poropat, Frank Flechtner
Date: October 19, 2017

Describes the atmospheric and ocean de-aliasing product (AOD1B) and the barotropic ocean model output (OCN1B).
Algorithm Theoretical Basis Document for GRACE Level 1B Data Processing
GRACE 327-741

Revision: 1.2
Authors: S.C. Wu, G. Kruizinga, W. Bertiger
Date: May 9, 2006

Describes the algorithms producing the main quantities on the Level 1B data.
Level 2 Documentation
GFZ Level-2 Processing Standards Document for Product Release 06
GRACE 327-743

Revision: 0.0
Author:  C. Dahle, et al.
Date: August 3, 2018

Describes the processing standards, models, and parameters adopted for the Level-2 Product Release 06 generated at GFZ.
CSR Level-2 Processing Standards Document for Product Release 06
GRACE 327-742

Revision: 5.0
Author: S. Bettadpur
Date: May 01, 2018

Describes the processing standards, models, and parameters adopted for the Level-2 Product Release 06 generated at CSR.
JPL Level-2 Processing Standards Document for Product Release 06
GRACE 327-744

Revision: 6.0
Authors: Dah-Ning Yuan
Date: June 1, 2018

Describes the processing standards, models, and parameters adopted for the Level-2 Product Release 06 generated at JPL.
Level-2 Gravity Field Product User Handbook
GRACE 327-734

Revision: 4.0
Author: S. Bettadpur
Date: April 25, 2018

Provides a description of the Earth gravity field estimates provided by the Level 2 processing.
Ancillary Documentation
An Analysis of Gravity-Field Estimation Based on Inter-satellite
Dual One-Way Biased Ranging
JPL Publication 98-15

Author: J.B. Thomas
Date: May 1999

Describes a dual one-way approach for extracting "high-rate" k-band intersateliite biased range measurements.
Optimal combination of quaternions from multiple star cameras
JPL Internal Memorandum

Author: L.J. Romans
Date: May 2003

Describes a procedure for optimally combining quaternions measured simultaneously from different aligned star cameras.
L1 and L2 Release Notes
Release Notes for CSR RL06 GRACE L2 products

Author: S. Bettadpur

Gives additional information on CSR RL06 GRACE L2 products (not contained in CSR RL05 processing standards document).
Release Notes for GFZ RL06 GRACE L2 products

Author: C. Dahle

Gives additional information on GFZ RL06 GRACE L2 products (not contained in GFZ RL05 processing standards document).
Release Notes for JPL RL06 GRACE L2 products

Author: Christopher M. McCullough, David N. Wiese, & Dah-Ning Yuan

Gives additional information on JPL RL06 GRACE L2 products (not contained in JPL RL05 processing standards document).
Technical Notes
GRACE Technical Note #01: Sequence of Events (SOE) File

Updated Daily

Provides a record of changes of the state of a specific satellite sensor or satellite event, which may alter the processing parameters used for the L1B processing. This file is updated on a daily basis.
GRACE Technical Note #02: ACC blases

Author: S. Bettadpur
Date: June 17, 2009

Provides recommendations for a-priori bias & scale parameters for Level 1B ACC data.
GRACE Technical Note #03: Sequence of Events (SOE) format description

Author: G. Kruizinga
Date: October 20, 2004

Provides a detailed description and format information on how the SOE file is organized.
GRACE Technical Note #04: Usage guidelines for GFZ RL03 and JPL RL02 GRACE gravity fields & atmosphere/ocean background models

Authors: S. Bettadpur, F. Flechtner, R. Schmidt
Date: May 9, 2006

Provides detailed guidelines for usage on GFZ RL03 and JPL RL02 GRACE models.
GRACE Technical Note #06: Impact of change in AOD1B on RL04 monthly GSM

Author: S. Bettadpur
Date: Feburary 21, 2008

Discusses the impact on GRACE level 2 products of the reprocessing of June 2006 through September 2007 GRACE AOD1B data. It is recommended that the following products be replaced with the re-processed ones: AOD1B, GSM-2, GAC-2, and GAD-2.
GRACE Technical Note #11:  Monthly estimates of C20 from 5 satellites based on GRACE RL06 models

Authors: M. Cheng and J.Ries
Date: Jan. 19, 2020

Use these estimates to replace the C20 values from the GSM files of the GRACE RL06 products only. These estimates are not intended to be used with the GRACE RL05 or earlier products.
GRACE Technical Note #12: Convert Global Mean OBP -> Global Mean Ocean Mass This calculation uses AOD1B 'GAC' fields, and integrates over the ocean-area only; due to the definition of 'GAC' (see AOD1B handbook for further details), the resulting mean value effectively represents 'mean atmospheric mass over the global ocean' for each time step.

GRACE Technical Note #13a: degree-1 (geocenter) gravity coefficients from CSR RL06

GRACE Technical Note #13a: degree-1 (geocenter) gravity coefficients from CSR RL06.1

This file contains monthly estimates of degree-1 gravity coefficients for the GRACE Release-06 data, based on ocean and atmospheric models and GRACE coefficients for degrees 2 and higher. 
GRACE Technical Note #13b: degree-1 (geocenter) gravity coefficients from GFZ RL06

GRACE Technical Note #13b: degree-1 (geocenter) gravity coefficients from GFZ RL06.1

This file contains monthly estimates of degree-1 gravity coefficients for the GRACE Release-06 data, based on ocean and atmospheric models and GRACE coefficients for degrees 2 and higher. 
GRACE Technical Note #13c: degree-1 (geocenter) gravity coefficients from JPL RL06

GRACE Technical Note #13c: degree-1 (geocenter) gravity coefficients from JPL RL06.1

 

 

This file contains monthly estimates of degree-1 gravity coefficients for the GRACE Release-06 data, based on ocean and atmospheric models and GRACE coefficients for degrees 2 and higher. 

GRACE Technical Note #14: NASA GSFC SLR C20 and C30 solutions

Authors: B.D. Loomis and K.E. Rachlin

This file contains SLR-derived C20 and C30 values for replacing GRACE/GRACE-FO GSM  Values prior to MJD 56006 use 5 satellites: LAGEOS-1/2, Stella, Starlette, AJISAI Values beginning on MJD 56006 use 7 atellites: LARES and Larets added C30 values are not provided prior to MJD 56006 Estimated parameters for both 5 and 7-satellite configurations: 5x5+C61,S61
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