Release Notes for GRACE L-2 products - version UTCSR RL-04 Last Product List Update: 2007-06-07 - Products for March 2007, 1 field, added -------------------------------------------------------------------------- Note Date 2007-06-07 0) This note supersedes (replaces) all previous Release Notes pertaining to the UTCSR-RL04 Level-2 products. 1) UTCSR-RL03 Level-2 products do not exist. The UTCSR-RL02 Level-2 products are now defunct. The UTCSR-RL01 Level-2 products will continue to be created in parallel, until further notice. 2) The list of RL-04 product files being made available to the users as of the date of this Release Note is given at the bottom of this message. Approximately once every month, one additional product set for the latest month is added, and the list is updated. 3) For each calendar month, in general four product files are available. For example, for the month of April 2005, the available products are: GSM-2_2005091-2005120_0030_UTCSR_0060_0004 GAC-2_2005091-2005120_0030_UTCSR_0000_0004 GAD-2_2005091-2005120_0030_UTCSR_0000_0004 GSM-2_2005091-2005120_0030_UTCSR_0060_0004.txt 3.1) The product file GSM-2_2005091-2005120_0030_UTCSR_0060_0004 contains the coefficients for the Earth gravity field for the indicated span. * The monthly gravity field solutions are completely UNCONSTRAINED. * In contrast to previous practice, coefficients are supplied to only degree and order 60. This is the highest degree that was solved from the data for each month. * The use of a suitable truncation or smoothing technique is recommended. Examples are available in the literature. The selection of the smoothing technique and the highest degree are left to the user's discretion. * ONLY the formal error standard deviations (sigmas) of the estimated geopotential harmonics are contained in the GSM-2* products. * Users desirous of replacing the C20 values of the GSM file with improved estimates are offered the option of using SLR-determined C20 values given in GRACE Technical Note - 05. Users should keep in mind that RL-04 Level-2 processing used different background models than the SLR data processing. Please see the CSR-L2 Proc Stds Doc and TN-05 for further information. 3.2) The product file GAC-2_2005091-2005120_0030_UTCSR_0000_0004 contains the average of the Release-04 AOD1B product for the same span as was used in creating the monthly solution. * Although this file contains the degree 0 and degree 1 harmonics for completeness, these harmonics were NOT used in Level-2 data processing. * The averaging is carried out over a whole number of days - regardless of whether full or partial day's data were used in creating the GRACE monthly solution. * ERRATA: Due to a programming quirk, the span of validity of a coefficient within the GRCOF2 record appears to be different in the GAC file when compared to the same record in the GSM file - the span in GSM file is correct. * GAD-2_2005091-2005120_0030_UTCSR_0000_0004: This is an ancillary product that represents the mean ocean bottom pressure. Please review the AOD1B Product Description Document for its complete definition and usage guidelines. Over the oceans, maps of GAC and GAD products will look the same only if degree 0 and degree 1 terms are included while drawing both the maps. Note, however, that degree-0 and degree-1 of the AOD products (from which GAC is derived) were not used in Level-2 data processing. The GAD* products were not used in GRACE data processing, and are provided only as a service to the user community. 3.3) The product file GSM-2_2005091-2005120_0030_UTCSR_0060_0004.txt contains the calibrated error standard deviations for the geopotential coefficient in the corresponding GSM-2_* file. * For each degree/order pair, the square-root of the error variance (the diagonal element of the error covariance matrix) is provided, in the same convention as the coefficients themselves. * These error estimates are calibrated using standard methods including sub-set and inter-month comparisons. These error estimates remain "best-guess" and can (& will) be refined as we receive feedback from data product users, or as the error calibration techniques improve. 4) MEAN FIELDS: At this time, no new mean gravity fields are provided. Mean fields GGM01 and GGM02 have already been made available - please see the RL01 Release Notes for further details. ------------------------------------------------------------------------------ LIST OF AVAILABLE PRODUCTS: (see date of last update on Line-2 of this file) GAC-2_2002102-2002120_0018_UTCSR_0000_0004 GAD-2_2002102-2002120_0018_UTCSR_0000_0004 GSM-2_2002102-2002120_0018_UTCSR_0060_0004 GSM-2_2002102-2002120_0018_UTCSR_0060_0004.txt GAC-2_2002121-2002139_0019_UTCSR_0000_0004 GAD-2_2002121-2002139_0019_UTCSR_0000_0004 GSM-2_2002121-2002139_0019_UTCSR_0060_0004 GSM-2_2002121-2002139_0019_UTCSR_0060_0004.txt GAC-2_2002213-2002243_0029_UTCSR_0000_0004 GAD-2_2002213-2002243_0029_UTCSR_0000_0004 GSM-2_2002213-2002243_0029_UTCSR_0060_0004 GSM-2_2002213-2002243_0029_UTCSR_0060_0004.txt GAC-2_2002244-2002273_0020_UTCSR_0000_0004 GAD-2_2002244-2002273_0020_UTCSR_0000_0004 GSM-2_2002244-2002273_0020_UTCSR_0060_0004 GSM-2_2002244-2002273_0020_UTCSR_0060_0004.txt GAC-2_2002274-2002304_0027_UTCSR_0000_0004 GAD-2_2002274-2002304_0027_UTCSR_0000_0004 GSM-2_2002274-2002304_0027_UTCSR_0060_0004 GSM-2_2002274-2002304_0027_UTCSR_0060_0004.txt GAC-2_2002305-2002334_0027_UTCSR_0000_0004 GAD-2_2002305-2002334_0027_UTCSR_0000_0004 GSM-2_2002305-2002334_0027_UTCSR_0060_0004 GSM-2_2002305-2002334_0027_UTCSR_0060_0004.txt GAC-2_2002335-2002365_0030_UTCSR_0000_0004 GAD-2_2002335-2002365_0030_UTCSR_0000_0004 GSM-2_2002335-2002365_0030_UTCSR_0060_0004 GSM-2_2002335-2002365_0030_UTCSR_0060_0004.txt GAC-2_2003001-2003031_0028_UTCSR_0000_0004 GAD-2_2003001-2003031_0028_UTCSR_0000_0004 GSM-2_2003001-2003031_0028_UTCSR_0060_0004 GSM-2_2003001-2003031_0028_UTCSR_0060_0004.txt GAC-2_2003032-2003059_0026_UTCSR_0000_0004 GAD-2_2003032-2003059_0026_UTCSR_0000_0004 GSM-2_2003032-2003059_0026_UTCSR_0060_0004 GSM-2_2003032-2003059_0026_UTCSR_0060_0004.txt GAC-2_2003060-2003090_0030_UTCSR_0000_0004 GAD-2_2003060-2003090_0030_UTCSR_0000_0004 GSM-2_2003060-2003090_0030_UTCSR_0060_0004 GSM-2_2003060-2003090_0030_UTCSR_0060_0004.txt GAC-2_2003091-2003120_0030_UTCSR_0000_0004 GAD-2_2003091-2003120_0030_UTCSR_0000_0004 GSM-2_2003091-2003120_0030_UTCSR_0060_0004 GSM-2_2003091-2003120_0030_UTCSR_0060_0004.txt GAC-2_2003121-2003141_0021_UTCSR_0000_0004 GAD-2_2003121-2003141_0021_UTCSR_0000_0004 GSM-2_2003121-2003141_0021_UTCSR_0060_0004 GSM-2_2003121-2003141_0021_UTCSR_0060_0004.txt GAC-2_2003182-2003212_0031_UTCSR_0000_0004 GAD-2_2003182-2003212_0031_UTCSR_0000_0004 GSM-2_2003182-2003212_0031_UTCSR_0060_0004 GSM-2_2003182-2003212_0031_UTCSR_0060_0004.txt GAC-2_2003213-2003243_0031_UTCSR_0000_0004 GAD-2_2003213-2003243_0031_UTCSR_0000_0004 GSM-2_2003213-2003243_0031_UTCSR_0060_0004 GSM-2_2003213-2003243_0031_UTCSR_0060_0004.txt GAC-2_2003244-2003273_0029_UTCSR_0000_0004 GAD-2_2003244-2003273_0029_UTCSR_0000_0004 GSM-2_2003244-2003273_0029_UTCSR_0060_0004 GSM-2_2003244-2003273_0029_UTCSR_0060_0004.txt GAC-2_2003274-2003304_0031_UTCSR_0000_0004 GAD-2_2003274-2003304_0031_UTCSR_0000_0004 GSM-2_2003274-2003304_0031_UTCSR_0060_0004 GSM-2_2003274-2003304_0031_UTCSR_0060_0004.txt GAC-2_2003305-2003334_0029_UTCSR_0000_0004 GAD-2_2003305-2003334_0029_UTCSR_0000_0004 GSM-2_2003305-2003334_0029_UTCSR_0060_0004 GSM-2_2003305-2003334_0029_UTCSR_0060_0004.txt GAC-2_2003335-2003365_0031_UTCSR_0000_0004 GAD-2_2003335-2003365_0031_UTCSR_0000_0004 GSM-2_2003335-2003365_0031_UTCSR_0060_0004 GSM-2_2003335-2003365_0031_UTCSR_0060_0004.txt GAC-2_2004001-2004013_0013_UTCSR_0000_0004 GAD-2_2004001-2004013_0013_UTCSR_0000_0004 GSM-2_2004001-2004013_0013_UTCSR_0060_0004 GSM-2_2004001-2004013_0013_UTCSR_0060_0004.txt GAC-2_2004035-2004060_0026_UTCSR_0000_0004 GAD-2_2004035-2004060_0026_UTCSR_0000_0004 GSM-2_2004035-2004060_0026_UTCSR_0060_0004 GSM-2_2004035-2004060_0026_UTCSR_0060_0004.txt GAC-2_2004061-2004091_0031_UTCSR_0000_0004 GAD-2_2004061-2004091_0031_UTCSR_0000_0004 GSM-2_2004061-2004091_0031_UTCSR_0060_0004 GSM-2_2004061-2004091_0031_UTCSR_0060_0004.txt GAC-2_2004092-2004121_0030_UTCSR_0000_0004 GAD-2_2004092-2004121_0030_UTCSR_0000_0004 GSM-2_2004092-2004121_0030_UTCSR_0060_0004 GSM-2_2004092-2004121_0030_UTCSR_0060_0004.txt GAC-2_2004122-2004152_0028_UTCSR_0000_0004 GAD-2_2004122-2004152_0028_UTCSR_0000_0004 GSM-2_2004122-2004152_0028_UTCSR_0060_0004 GSM-2_2004122-2004152_0028_UTCSR_0060_0004.txt GAC-2_2004153-2004182_0030_UTCSR_0000_0004 GAD-2_2004153-2004182_0030_UTCSR_0000_0004 GSM-2_2004153-2004182_0030_UTCSR_0060_0004 GSM-2_2004153-2004182_0030_UTCSR_0060_0004.txt GAC-2_2004183-2004213_0031_UTCSR_0000_0004 GAD-2_2004183-2004213_0031_UTCSR_0000_0004 GSM-2_2004183-2004213_0031_UTCSR_0060_0004 GSM-2_2004183-2004213_0031_UTCSR_0060_0004.txt GAC-2_2004214-2004244_0031_UTCSR_0000_0004 GAD-2_2004214-2004244_0031_UTCSR_0000_0004 GSM-2_2004214-2004244_0031_UTCSR_0060_0004 GSM-2_2004214-2004244_0031_UTCSR_0060_0004.txt GAC-2_2004245-2004274_0030_UTCSR_0000_0004 GAD-2_2004245-2004274_0030_UTCSR_0000_0004 GSM-2_2004245-2004274_0030_UTCSR_0060_0004 GSM-2_2004245-2004274_0030_UTCSR_0060_0004.txt GAC-2_2004275-2004305_0031_UTCSR_0000_0004 GAD-2_2004275-2004305_0031_UTCSR_0000_0004 GSM-2_2004275-2004305_0031_UTCSR_0060_0004 GSM-2_2004275-2004305_0031_UTCSR_0060_0004.txt GAC-2_2004306-2004335_0030_UTCSR_0000_0004 GAD-2_2004306-2004335_0030_UTCSR_0000_0004 GSM-2_2004306-2004335_0030_UTCSR_0060_0004 GSM-2_2004306-2004335_0030_UTCSR_0060_0004.txt GAC-2_2004336-2004366_0028_UTCSR_0000_0004 GAD-2_2004336-2004366_0028_UTCSR_0000_0004 GSM-2_2004336-2004366_0028_UTCSR_0060_0004 GSM-2_2004336-2004366_0028_UTCSR_0060_0004.txt GAC-2_2005001-2005031_0031_UTCSR_0000_0004 GAD-2_2005001-2005031_0031_UTCSR_0000_0004 GSM-2_2005001-2005031_0031_UTCSR_0060_0004 GSM-2_2005001-2005031_0031_UTCSR_0060_0004.txt GAC-2_2005032-2005059_0028_UTCSR_0000_0004 GAD-2_2005032-2005059_0028_UTCSR_0000_0004 GSM-2_2005032-2005059_0028_UTCSR_0060_0004 GSM-2_2005032-2005059_0028_UTCSR_0060_0004.txt GAC-2_2005060-2005090_0028_UTCSR_0000_0004 GAD-2_2005060-2005090_0028_UTCSR_0000_0004 GSM-2_2005060-2005090_0028_UTCSR_0060_0004 GSM-2_2005060-2005090_0028_UTCSR_0060_0004.txt GAC-2_2005091-2005120_0030_UTCSR_0000_0004 GAD-2_2005091-2005120_0030_UTCSR_0000_0004 GSM-2_2005091-2005120_0030_UTCSR_0060_0004 GSM-2_2005091-2005120_0030_UTCSR_0060_0004.txt GAC-2_2005121-2005151_0031_UTCSR_0000_0004 GAD-2_2005121-2005151_0031_UTCSR_0000_0004 GSM-2_2005121-2005151_0031_UTCSR_0060_0004 GSM-2_2005121-2005151_0031_UTCSR_0060_0004.txt GAC-2_2005152-2005181_0030_UTCSR_0000_0004 GAD-2_2005152-2005181_0030_UTCSR_0000_0004 GSM-2_2005152-2005181_0030_UTCSR_0060_0004 GSM-2_2005152-2005181_0030_UTCSR_0060_0004.txt GAC-2_2005182-2005212_0031_UTCSR_0000_0004 GAD-2_2005182-2005212_0031_UTCSR_0000_0004 GSM-2_2005182-2005212_0031_UTCSR_0060_0004 GSM-2_2005182-2005212_0031_UTCSR_0060_0004.txt GAC-2_2005213-2005243_0031_UTCSR_0000_0004 GAD-2_2005213-2005243_0031_UTCSR_0000_0004 GSM-2_2005213-2005243_0031_UTCSR_0060_0004 GSM-2_2005213-2005243_0031_UTCSR_0060_0004.txt GAC-2_2005244-2005273_0030_UTCSR_0000_0004 GAD-2_2005244-2005273_0030_UTCSR_0000_0004 GSM-2_2005244-2005273_0030_UTCSR_0060_0004 GSM-2_2005244-2005273_0030_UTCSR_0060_0004.txt GAC-2_2005274-2005304_0031_UTCSR_0000_0004 GAD-2_2005274-2005304_0031_UTCSR_0000_0004 GSM-2_2005274-2005304_0031_UTCSR_0060_0004 GSM-2_2005274-2005304_0031_UTCSR_0060_0004.txt GAC-2_2005305-2005334_0030_UTCSR_0000_0004 GAD-2_2005305-2005334_0030_UTCSR_0000_0004 GSM-2_2005305-2005334_0030_UTCSR_0060_0004 GSM-2_2005305-2005334_0030_UTCSR_0060_0004.txt GAC-2_2005335-2005365_0026_UTCSR_0000_0004 GAD-2_2005335-2005365_0026_UTCSR_0000_0004 GSM-2_2005335-2005365_0026_UTCSR_0060_0004 GSM-2_2005335-2005365_0026_UTCSR_0060_0004.txt GAC-2_2006001-2006031_0031_UTCSR_0000_0004 GAD-2_2006001-2006031_0031_UTCSR_0000_0004 GSM-2_2006001-2006031_0031_UTCSR_0060_0004 GSM-2_2006001-2006031_0031_UTCSR_0060_0004.txt GAC-2_2006032-2006059_0028_UTCSR_0000_0004 GAD-2_2006032-2006059_0028_UTCSR_0000_0004 GSM-2_2006032-2006059_0028_UTCSR_0060_0004 GSM-2_2006032-2006059_0028_UTCSR_0060_0004.txt GAC-2_2006060-2006090_0029_UTCSR_0000_0004 GAD-2_2006060-2006090_0029_UTCSR_0000_0004 GSM-2_2006060-2006090_0029_UTCSR_0060_0004 GSM-2_2006060-2006090_0029_UTCSR_0060_0004.txt GAC-2_2006091-2006120_0030_UTCSR_0000_0004 GAD-2_2006091-2006120_0030_UTCSR_0000_0004 GSM-2_2006091-2006120_0030_UTCSR_0060_0004 GSM-2_2006091-2006120_0030_UTCSR_0060_0004.txt GAC-2_2006121-2006151_0031_UTCSR_0000_0004 GAD-2_2006121-2006151_0031_UTCSR_0000_0004 GSM-2_2006121-2006151_0031_UTCSR_0060_0004 GSM-2_2006121-2006151_0031_UTCSR_0060_0004.txt GAC-2_2006152-2006181_0029_UTCSR_0000_0004 GAD-2_2006152-2006181_0029_UTCSR_0000_0004 GSM-2_2006152-2006181_0029_UTCSR_0060_0004 GSM-2_2006152-2006181_0029_UTCSR_0060_0004.txt GAC-2_2006182-2006212_0031_UTCSR_0000_0004 GAD-2_2006182-2006212_0031_UTCSR_0000_0004 GSM-2_2006182-2006212_0031_UTCSR_0060_0004 GSM-2_2006182-2006212_0031_UTCSR_0060_0004.txt GAC-2_2006213-2006243_0031_UTCSR_0000_0004 GAD-2_2006213-2006243_0031_UTCSR_0000_0004 GSM-2_2006213-2006243_0031_UTCSR_0060_0004 GSM-2_2006213-2006243_0031_UTCSR_0060_0004.txt GAC-2_2006244-2006273_0030_UTCSR_0000_0004 GAD-2_2006244-2006273_0030_UTCSR_0000_0004 GSM-2_2006244-2006273_0030_UTCSR_0060_0004 GSM-2_2006244-2006273_0030_UTCSR_0060_0004.txt GAC-2_2006274-2006304_0031_UTCSR_0000_0004 GAD-2_2006274-2006304_0031_UTCSR_0000_0004 GSM-2_2006274-2006304_0031_UTCSR_0060_0004 GSM-2_2006274-2006304_0031_UTCSR_0060_0004.txt GAC-2_2006305-2006334_0030_UTCSR_0000_0004 GAD-2_2006305-2006334_0030_UTCSR_0000_0004 GSM-2_2006305-2006334_0030_UTCSR_0060_0004 GSM-2_2006305-2006334_0030_UTCSR_0060_0004.txt GAC-2_2006335-2006365_0028_UTCSR_0000_0004 GAD-2_2006335-2006365_0028_UTCSR_0000_0004 GSM-2_2006335-2006365_0028_UTCSR_0060_0004 GSM-2_2006335-2006365_0028_UTCSR_0060_0004.txt GAC-2_2007001-2007031_0026_UTCSR_0000_0004 GAD-2_2007001-2007031_0026_UTCSR_0000_0004 GSM-2_2007001-2007031_0026_UTCSR_0060_0004 GSM-2_2007001-2007031_0026_UTCSR_0060_0004.txt GAC-2_2007032-2007059_0028_UTCSR_0000_0004 GAD-2_2007032-2007059_0028_UTCSR_0000_0004 GSM-2_2007032-2007059_0028_UTCSR_0060_0004 GSM-2_2007032-2007059_0028_UTCSR_0060_0004.txt GAC-2_2007060-2007090_0031_UTCSR_0000_0004 GAD-2_2007060-2007090_0031_UTCSR_0000_0004 GSM-2_2007060-2007090_0031_UTCSR_0060_0004 GSM-2_2007060-2007090_0031_UTCSR_0060_0004.txt