GRACE Documentation

General Documentation
GRACE Science Data System Development Plan GRACE 327-710 Revision: C Authors: M. Watkins, T. Gruber, S. Bettadpur Date: August 2, 2004	Defines the GRACE Science Data System (SDS) and describes the data flow and roles and responsibilities of each SDS component.
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.
GRACE Monthly SDS Newsletter Revision: N/A Author: F. Flechtner	Monthly newletter provided by the GRACE Science Data System describing science relevant events on the GRACE spacecrafts and statistics on L0, L1 and L2 product generation.
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: 3.1 Author: F. Flechtner Date: April 13, 2007	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 05 GRACE 327-743 Revision: 1.1 Author: C. Dahle Date: January 30, 2013	Describes the processing standards, models, and parameters adopted for the Level-2 Product Release 05 generated at GFZ.
CSR Level-2 Processing Standards Document for Product Release 05 GRACE 327-742 Revision: 4.0 Author: S. Bettadpur Date: May 29, 2012	Describes the processing standards, models, and parameters adopted for the Level-2 Product Release 05 generated at CSR.
JPL Level-2 Processing Standards Document for Product Release 05 GRACE 327-744 Revision: 5.0 Authors: M. Watkins. D. Yuan Date: March 17. 2012	Describes the processing standards, models, and parameters adopted for the Level-2 Product Release 05 generated at JPL.
GRACE Gravity Field Solution Data Format GRACE 327-732 Revision: 1.1 Author: F. Flechtner Date: November 27, 2003	Describes the Level-2 GRACE gravity data formats.
Level-2 Gravity Field Product User Handbook GRACE 327-734 Revision: 3.0 Author: S. Bettadpur Date: May 29, 2012	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.
Relative Time and Frequency Alignment between Two Low Earth Orbiters *GRACE, Proceedings of IEEE,* FCS, Tampa, FL Authors: W. Bertiger, C. Dunn, I. Harris, G. Kruizinga, L. Romans, M. Watkins, and S.C. Wu Date:** May 2003	Describes the validation of the relative clock accuracy.
L1 and L2 Release Notes
Release Notes for GRACE L1B products Author: G. Kruizinga	Gives additional information on GRACE L1B products (not contained in other L1 documents).
Release Notes for CSR RL05 GRACE L2 products Author: S. Bettadpur
Release Notes for GFZ RL05 GRACE L2 products Author: C. Dahle	Gives additional information on GFZ RL05 GRACE L2 products (not contained in GFZ RL04 processing standards document).
Release Notes for JPL RL05 GRACE L2 products Author: D. Yuan	Gives additional information on JPL RL05 GRACE L2 products (not contained in JPL RL04 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 #05: Monthly estimates of C20 from 5 SLR satellites Authors: M. Cheng and J. Ries	Provides C20 estimates obtained from SLR analysis which may be used when analyzing CSR RL04 L2 products.
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 #07: Monthly estimates of C20 from 5 satellites based on GRACE RL05 models Authors: M. Cheng and J.Ries Date: Routinely updated	Provides RL05-compatible values of SLR-drived C20 harmonics to replace those found in CSR/JPL-RL05 GSM files.

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GRACE Documentation