PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT NOTE = "Comments on GRAIL: DERIVED GRAVITY DATA archive." PUBLICATION_DATE = 2023-05-30 END_OBJECT = TEXT END COMMENTS ON "GRAIL: DERIVED GRAVITY DATA" ARCHIVE VOLUME GRAIL_1001: 2023-05-30 1. Minor updates have been made to the GSFC GRAIL sha and shb PDS3 and PDS4 labels. The file comment regarding the principal axis frame has been revised. ---------------------------------------------------------------------------- 2021-03-30 1. Addition of a spherical model GRGM1200L, part of Goossens LDAP 2014. New files are gggrx_1200l_bouguer_sha and gggrx_1200l_sha in the SHADR directory. Additional files have also been added to the EXTRAS/GEOTIFF directory (see grgm1200l_description.txt). More information can be found in lgrs_rdr_ds.cat. ---------------------------------------------------------------------------- 2020-07-08 1. Addition of a spherical model GRGM1200B, part of Goossens LDAP 2014. New files are gggrx_1200b_lambda1_sha and gggrx_1200b_sha; the former does not follow naming convention. More information can be found in lgrs_rdr_ds.cat. ---------------------------------------------------------------------------- 2016-05-06, GRAIL Release 7 1. A new spherical harmonic model, GRGM1200A, is released from the GSFC GRAIL team. Data from both the primary and extended missions are included. The release includes the spherical harmonics coefficients for the field, GGGRX_1200A_SHA.TAB, and for the topography-corrected Bouguer field, GGGRX_1200A_BOUGUER_SHA.TAB. The covariance matrix of GRGM1200A was computed and truncated at various degrees (L=50, L=180, L=420, L=660, and L=900). The archive now also contains various gravity map products, such as gravity anomalies, gravity anomaly errors, gravity disturbances, and gravity Bouguer disturbances. Several of each map type are available, expanded or computed to different truncation degree (L=50, L=180, L=420, L=660, L=900, and L=1200). Maps of geoid heights (L=660) and of the gravity field degree strength are also archived. In addition to the standard IMG format, those maps are available in the GeoTIFF format in the EXTRAS/GEOTIFF directory. 500 clone fields of GRGM1200A are also available in ASCII format in EXTRAS/CLONES. Those clone fields are alternate gravity fields, equivalent to GRGM1200A in terms of their covariance, including the error calibration performed at GSFC. The new file, DSMAP_1200A.CAT, contains map projection information for the GRGM1200A RSDMAP data. ---------------------------------------------------------------------------- 2016-02-29, GRAIL Release 6 1. A new spherical harmonic model, GL1500E, is released from the JPL GRAIL team. Data from both the primary and extended missions are included. Only the field solution, jggrx_1500e_sha.tab, is archived; the covariance matrix has not been updated. ---------------------------------------------------------------------------- 2014-07-01, GRAIL Release 5 1. New spherical harmonic models are released from the Goddard and JPL GRAIL teams. Data from both the primary and extended missions are included. 2. All SPK data products have been revised. Data from both the primary and extended missions are now included. 3. Labels for GGGRX_0660PM_ANOM_L320.IMG and JGGRX_0660B_ANOM_L320.IMG have been revised. 4. The Goddard 0900C SHBDR data products will be added to the archive at a later date. 5. 3 documents have been revised. Revised files include: ARCHSIS.*, DPSIS.*, and RSDMAP.*. 6. Several files have been added to the EXTRAS directory. Please see extrinfo.txt for more information. ---------------------------------------------------------------------------- 2014-04-01, GRAIL Release 4 A couple documentation files have been revised. Please see the Change Logs for more information. Revised files include: ARCHSIS.* ATBD.* DPSIS.* The BLACKJACKDLP.* document has been cleared for public release. ---------------------------------------------------------------------------- 2013-10-30 3 SHBDR data products have been added to the archive volume: GGGRX_0660PM_SHB_L180.DAT GGGRX_0660PM_SHB_L420.DAT GGGRX_0660PM_SHB_L660.DAT ---------------------------------------------------------------------------- 2013-10-11, GRAIL Release 3 First release of GRAIL RDR archive volume. ----------------------------------------------------------------------------