PDS_VERSION_ID = PDS3
RECORD_TYPE = FIXED_LENGTH
RECORD_BYTES = 80
OBJECT = TEXT
INTERCHANGE_FORMAT = ASCII
PUBLICATION_DATE = 2004-12-08
NOTE = "N/A"
END_OBJECT = TEXT
END
Mars Global Surveyor Radio Science Team
Science Data Products Archive
(MGS-M-RSS-5-SDP-V1.0)
AAREADME.TXT
R.A. Simpson
Stanford University
==============================================================================
INTRODUCTION
==============================================================================
This compact disc contains archival radio science results from the Mars
Global Surveyor (MGS) mission. This is one of several such discs -- issued at
three to six month intervals -- containing results from radio occultation,
gravity, and participating scientist investigations carried out by members of
the MGS Radio Science Team (RST). The archive was prepared under standards
of the Planetary Data System (PDS).
Radio measurements were made using the MGS spacecraft and Earth-based
stations of the NASA Deep Space Network (DSN). Radio tracking data were
collected for use in generating high-resolution gravity field models.
Measurements of the amplitude and phase of the radio signal were used to
infer the density and structure of Mars' atmosphere and ionosphere and the
reflecting properties of Mars' surface.
Data are organized in approximately chronological order. Delay in
receipt of ancillary files required for processing (or reprocessing of data
with different ancillary files, parameters, or algorithms) results in some
files being out of strict chronological order. And processing priorities may
result in deviations from strict chronological order. A table of contents is
included with each volume, listing each file in the volume; a separate table
of contents shows all files within the data set.
The table immediately below lists the individual volumes (CDs) created
to date and (very briefly) their respective contents. More detail is
provided in the section Summary of Volume Contents.
VOLUME_ID Start Date End Date Notes
--------- ------------------- ------------------- -------------------------
MORS_1001 1998-01-24 (98/024) 1998-04-28 (98/118) First occultation season
MORS_1002 1998-04-29 (98/119) 1998-09-30 (98/273) Gravity data through SPO
MORS_1003 1998-10-01 (98/274) 1999-03-31 (99/090) Early Mapping results
MORS_1004 1999-04-01 (99/091) 1999-11-08 (99/312) 7 months of Mapping
MORS_1005 1999-03-09 (99/068) 1999-03-27 (99/076) Fixed HGA occultations
MORS_1006 1999-03-09 (99/068) 2000-03-27 (00/087) Mapping
MORS_1007 1998-12-24 (98/358) 1999-05-29 (99/149) AB-2 EDS and Mapping SRx
MORS_1008 1999-05-06 (99/126) 2000-02-29 (00/060) GMM2B grav; 1999 TPS,SRx
MORS_1009 1998-03-28 (98/087) 2000-09-29 (00/273) MGS75E gravity
MORS_1010 1999-03-09 (99/068) 2000-02-07 (00/038) ionosphere, atmos occns
MORS_1011 2000-11-01 (00/306) 2000-12-31 (00/366) ion/atm occns Nov-Dec 00
MORS_1012 1999-12-19 (99/353) 2000-01-31 (00/031) AB-2 SRx
MORS_1013 2000-02-01 (00/032) 2000-03-31 (00/091) Mapping SRx
2000-08-01 (00/214) 2000-10-31 (00/305) Mapping TPS (ingress)
MORS_1014 2001-01-01 (01/001) 2001-03-31 (00/090) Mapping SRx
MORS_1015 1999-05-06 (99/126) 2001-07-21 (01/202) MGS85F, MGM1025, EDS, TPS
MORS_1016 SRA; revised TPS; egr TPS
MORS_1017 1999-12-20 (99/354) 2000-05-31 (00/152) TPS 0/04-5; SRA thru 0/38
MORS_1018 2001-01-01 (01/001) 2001-06-20 (02/171) TPS 1/02-6; SRA 1/01-3
MORS_1019 1998-03-28 (98/087) 2002-04-14 (02/104) TPS 1/06-7; EDS; SHA 85H2
MORS_1020 2000-02-08 (00/039) 2000-02-29 (00/060) TPS Early Beta Supplement
2002-03-14 (02/073) 2002-05-17 (02/137) TPS
MORS_1021 1997-10-13 (97/285) 2002-05-27 (02/147) MGM1041C; TPS
MORS_1022 2002-05-18 (02/138) 2002-07-15 (02/196) TPS pre-solar conjunction
MORS_1023 2000-11-04 (00/306) 2002-10-31 (02/304) 2000 EDS, 2002 TPS
MORS_1024 1998-03-28 (98/087) 2003-11-09 (03/313) 2 SHA, 1225 TPS, 840 EDS
MORS_1025 2003-03-22 (03/081) 2003-06-10 (03/161) Mar-June 2003 TPS
MORS_1026 2003-06-18 (03/169) 2003-09-10 (03/253) Jun-Sep TPS
MORS_1027 2002-09-30 (02/273) 2003-08-18 (03/230) TPS (egress campaigns)
2002-11-01 (02/305) 2002-12-31 (02/365) EDS (ingress)
MORS_1028 2003-09-11 (03/254) 2003-10-18 (03/291) TPS
2003-01-01 (03/001) 2003-03-21 (03/080) EDS (ingress)
MORS_1029 2003-11-16 (03/315) 2004-01-19 (04/019) TPS (egress)
2003-03-22 (03/081) 2003-06-04 (03/155) EDS ingress)
==============================================================================
VOLUME SET INFORMATION
==============================================================================
This disc is one of several which contain reduced data from MGS radio
science investigations. Each archive volume has the general structure
illustrated in the diagram below. Not all directories or files will be
present on every disc, however. For example, only four data directories are
included on the first two volumes (MORS_1001 and MORS_1002). In cases where
the directory contains no files, the directory itself has been omitted from
the CD-WO volume. More information on the organization of the CD can be
found in the Software Interface Specification (SIS) for the data set in the
DOCUMENT directory (file RSADCSDP.TXT).
Data types from radio occultation observations include atmospheric
temperature-pressure profiles at both standard (data type TPS) and high
resolution (TPH), occultation summary files for standard (OCS) and high-
resolution (OCH) data, and electron density profiles at both standard (EDS)
and high resolution (EDH). Data types from radio-tracking observations
include spherical harmonic models of the gravity field in ASCII (SHA) and
binary (SHB) formats, maps and images based on spherical harmonic models
(IMG), and line-of-sight acceleration profiles (LOS). Data types from
Participating Scientist investigations include Surface Reflection Tables
(SRT), Surface Reflection Images (SRI), Surface Reflection Geometry (SRG)
and Surface Reflection Antenna (SRA) files. Files in the browse directory
(BRO), if included, are snapshots of other products included in this volume.
The diagram below shows the organization of this volume, starting from
the root of the compact disc.
root
|
|- AAREADME.TXT
|- ERRATA.TXT
|- VOLDESC.CAT
|
|- CATALOG
| |
| |- CATINFO.TXT Streamlined PDS catalog files
| |- MISSION.CAT for mission, host, instrument,
| |- INSTHOST.CAT references, personnel, data
| |- INST.CAT set, target, and data set map
| |- REF.CAT projection (files evolve as
| |- PERSON.CAT the mission progresses).
| |- DATASET.CAT
| |- TARGET.CAT
| |- DSMAP2.CAT
| `- DSMAP3.CAT
|
|- DOCUMENT
| |
| |- DOCINFO.TXT Overview of directory
| |- RSADCSDP.TXT SIS document for the data set
| |- RSTP.TXT SIS for TPS and TPH file types
| |- OCCSUM.TXT SIS for OCS and OCH file types
| |- LOSAPDR.TXT SIS for LOS file type
| |- SHADR.TXT SIS for SHA file type
| |- SHBDR.TXT SIS for SHB file type
| |- RSDMAP.TXT SIS for IMG file type
| |- EDS.TXT SIS for data types EDH and EDS
| |- SRX.TXT SIS for data types SRA, SRG, SRI, and SRT
| |- OCCLOGM4.TAB Data acquisition parameters (2001-2004)
| `- OCCLOGM4.LBL Detached PDS label for OCCLOGM4.TAB
|
|- INDEX
| |
| |- INDXINFO.TXT Overview of directory
| |- INDEX.LBL Label to INDEX.TAB
| |- INDEX.TAB List of data file contents, this volume
| |- CUMINDEX.LBL Label to CUMINDEX.TAB
| `- CUMINDEX.TAB List of data file contents, all volumes
|
|
| DATA DIRECTORIES
|
|- EDS Electron Density Profiles
| |
| |- ydddHmmN.TPS Nth solution for data beginning year y,
| |- ydddHmmN.LBL day ddd, hour H, minute mm; PDS label
| |- ... (repeated for 526 profiles)
| `- ... ...
|
|- OCS Occultation Summary File
| |
| |- 209308AA.OCS Summary of TPS files from Sept 2002
| `- 209308AA.LBL to August 2003; PDS label
|
`- TPS Occultation Temperature-Pressure Profiles
|
|- ydddHmmN.TPS Nth solution for data beginning year y,
|- ydddHmmN.LBL day ddd, hour H, minute mm; PDS label
|- ... (repeated for 84 profiles)
`- ... ...
To locate specific data files within the volume set, users should consult
CUMINDEX.TAB in the INDEX directory of the highest numbered volume available.
All files appearing in data directories (e.g., IMG, SHA) will be listed in
INDEX.TAB for the volume and in CUMINDEX.TAB for the volume set. For purposes
of indexing, BRO files are considered data and will appear in these files.
Files in other directories (e.g., CATALOG, DIRECTORY) generally appear on many
volumes. They are described in a *INFO.TXT file within their directory; they
do not appear in INDEX.TAB or CUMINDEX.TAB.
==============================================================================
ERRATA
==============================================================================
A cumulative list of errors and changes is maintained in the file
ERRATA.TXT at the root level of each volume. ERRATA.TXT in higher numbered
volumes (or higher version numbers) will have errors for earlier volumes.
==============================================================================
DISC FORMAT
==============================================================================
The disc is organized according to the PDS standard for "one data set,
many volumes." This file (AAREADME.TXT), a PDS volume object definition
(VOLDESC.CAT), and the listing of errors and changes (ERRATA.TXT) are
included at the root level. The following directories of descriptive
material are also at the root level:
CATALOG contains descriptive files for cataloging the data
on this disc.
DOCUMENT contains a plain text Software Interface Specification
(SISs) for the data set and for each component file
type, a table of data acquisition parameters, and other
documentation.
INDEX contains index information (table of contents) on each of
the data files included in this disc; it also includes a
cumulative index to all files in this set of discs.
The remaining directories at the root level contain data files and detached
PDS labels.
==============================================================================
FILE FORMAT
==============================================================================
All data files on the disc are accompanied by detached PDS labels, which
describe their contents. PDS TEXT objects have attached labels.
Detached labels have the same file name as the data file except that the
label name has the suffix "LBL". The label fully describes the format and
content of its associated file. Detached labels use pointers to reference
the data file -- for example,
^IMAGE = "JGM50C01.IMG"
points to JGM50C01.IMG, which contains the actual image described by the
label. Some data files contain more than one structure. For example,
^RSTP_HDR_TABLE = ("8028D38A.TPS",1)
^RSTP_TABLE = ("8028D38A.TPS",4)
are pointers to the file 8028D38A.TPS which contains two tables, one
beginning at record 1 and one beginning at record 4. Additional documentation
on all data file types is available in Software Interface Specifications in
the DOCUMENT directory.
Text files, including data files of ASCII text and all labels (*.LBL
files) and tables (*.TAB files), are delimited with carriage-return (ASCII 13)
line-feed (ASCII 10) pairs at the end of each line. PostScript (*.PS and
*.PS1 files) and TeX files (*.TEX files) also have records delimited by
carriage-return line-feed pairs. Detached labels and text files (*.TXT file
names) have fixed length records of 80 bytes to facilitate their use as either
fixed-length record files or as stream files with carriage-return line-feed
delimiters. Catalog files (*.CAT files) have fixed length records of 72 bytes
ending with a carriage-return line-feed pair. The VOLDESC.CAT file in the
root is an exception; it has 80 byte fixed-length records.
==============================================================================
SUMMARY OF VOLUME CONTENTS
==============================================================================
MORS_1029 contains 436 atmospheric profiles from November 2003 through
January 2004. During the course of these measurements, signal-to-noise was
decreasing; opposition was in August 2003. Profiles are in the TPS directory.
The one file in the OCS directory contains summary information. MORS_1029
also contains 630 electron density profiles for the ionosphere; data were
collected during March-June 2003.
==============================================================================
SOFTWARE
==============================================================================
No software is included with this data set.
==============================================================================
CITATIONS
==============================================================================
Users wishing to cite products in this volume should use the following
volume information:
Authors: G.L. Tyler, G. Balmino, D.P. Hinson, W.L. Sjogren,
D.E. Smith, R. Woo, J.W. Armstrong, F.M. Flasar,
R.A. Simpson, S. Asmar, A. Anabtawi, and P. Priest
Editor: R.A. Simpson
Volume Set Name: MGS RST Science Data Products
Volume: USA_NASA_JPL_MORS_1029
Data Set ID: MGS-M-RSS-5-SDP-V1.0
Publisher: NASA Planetary Data System
Year: 2004
==============================================================================
ACKNOWLEDGMENTS
==============================================================================
These data were collected under auspices of the Mars Global Surveyor
Project. G. Leonard Tyler of Stanford University was the Radio Science Team
Leader. Members of the Team and its support elements involved in data
acquisition and validation included Patricia Priest, Sami Asmar, Aseel
Anabtawi, Elias Barbinis, Tim Smith, Paula Eshe, William Sjogren, Frank
Lemoine, and Joe Twicken. At PDS the assistance of Joel Wilf, Lyle Huber,
and Ed Guinness was appreciated.
==============================================================================
DISCLAIMER
==============================================================================
Although considerable care has gone into making this volume set, errors
are possible. Reports of errors or difficulties would be appreciated. Please
contact one of the persons listed below.
==============================================================================
COGNIZANT PERSONNEL
==============================================================================
The person most directly responsible for construction and release of
this volume set was Dick Simpson, Experiment Engineer for the Mars Global
Surveyor Radio Science Team and Radio Science Advisor to the Planetary Data
System. Although many people contributed to the volume set, any faults in
the product are his alone. G. Leonard Tyler was the Leader of the MGS Radio
Science Team.
Richard A. Simpson
Center for Radar Astronomy
Packard Building - Room 332
350 Serra Mall
Stanford University
Stanford, CA 94305-9515
Tel: 650-723-3525
FAX: 650-723-9251
rsimpson@magellan.stanford.edu
G. Leonard Tyler
Center for Radar Astronomy
Packard Building - Room 331
350 Serra Mall
Stanford University
Stanford, CA 94305-9515
Tel: 650-723-3535
FAX: 650-723-9251
len.tyler@stanford.edu
==============================================================================
ACRONYMS AND ABBREVIATIONS
==============================================================================
CD Compact Disc
BRO Browse directory
DSN Deep Space Network
EDH Electron Density Profile (high resolution) (directory and files)
EDS Electron Density Profile (standard resolution) (directory and files)
HGA High-Gain Antenna
IMG Radio Science Digital Map (RSDMAP Product)
IPS Intensity Power Spectra (directory and files)
MGS Mars Global Surveyor
OCH Occultation Summary File (high resolution products)
OCS Occultation Summary File (standard resolution products)
PDS Planetary Data System
RSS Radio Science Subsystem
RST Radio Science Team
SDP Science Data Products
SHA Spherical Harmonic Model (ASCII format)
SHB Spherical Harmonic Model (binary format)
SIS Software Interface Specification
SRA Surface Reflection Antenna (directory and files)
SRG Surface Reflection Geometry (directory and files)
SRI Surface Reflection Image (directory and files)
SRT Surface Reflection Table (directory and files)
TPH Temperature-Pressure Profile (high resolution processing)
TPS Temperature-Pressure Profile (standard resolution)
WO Write Once