PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = "2009-03-18" NOTE = "AAREADME.TXT describes this archive product." END_OBJECT = TEXT END Volume MGS_MAG_HIGH_RES Mars Global Surveyor Magnetometer MAG High-Resolution (Detail) Data Planetary Plasma Interactions Discipline Node of the Planetary Data System ============================================================================== Introduction ============================================================================== This data volume contains a subset of the High-Resolution (Detail) data from the Mars Global Surveyor (MGS) Magnetometer (MAG) instrument, submitted to the Planetary Data System (PDS). Users are encouraged to provide comments back to the PPI Node of the PDS if errors or omissions are found either in data or in documentation. Please send comments by e-mail or U.S. mail to PDS Operator as defined at the end of this document. Questions regarding data content, processing, or quality should be sent to Dr. J.E.P. Connerney jack.connerney@nasa.gov NASA Goddard Space Flight Center Code 695 Greenbelt, MD 20771 ============================================================================== Brief Volume Description ============================================================================== This volume contains MGS MAG high time resolution (Detail) data from the premapping and mapping periods of the MGS mission. The mapping data here cover the prime mission Mapping phase and part of the period of the Extended Missions. All data files are stored in the "DATA" branch of the directory tree. All data are stored in ASCII tables with attached MAG team headers. The documentation for this volume is located in the CATALOG directory. The data set is documented as part of the archive (*DS.CAT); so are the MAG and ER instruments (*INST.CAT), the MGS mission (MISSION.CAT) and spacecraft (MGS_HOST.CAT), the MAG/ER team, and useful literature references. All data files in this volume are described by detached PDS labels (.LBL) and format files (.FMT). Metadata are stored as text files with the data. Information on the particular form of metadata used in the PDS catalog can be found in the CATALOG directory. ============================================================================== Volume Format Information ============================================================================== At present, these data are stored on hard disk for online delivery. ============================================================================== File Formats ============================================================================== The data files on this volume are ASCII text files. All data files are described by detached PDS labels. A detached label file has the same name as the data file that it describes, but with the extension .LBL. All documents, detached PDS labels, and HTML files (if any) are stream format files, with a carriage return (ASCII 13) and a line feed character (ASCII 10) at the end of the record. This allows the files to be read by MacOS, DOS, Windows, UNIX, and VMS operating systems. UNIX system users may see an unnecessary carriage return character (^M) at the end of each line. Mac users may see an unnecessary line feed character (^J) at the start of each line. PDS labels are object-oriented. The object to which the label refers (e.g., SERIES, TABLE, etc.) is denoted by a statement of the form: ^object = location in which the caret character (^, also called a pointer in this context) indicates that the object starts at the given location. For an object in the same file as the label, the location is an integer representing the starting record number or byte of the object (the first record/byte in the file is 1). For an object located outside the label file, the location denotes the name of the file containing the object, along with the starting record or byte number. For example: ^SERIES = ("20903684.DAT", 3) indicates that the SERIES object begins at record 3 of the file 20903684.DAT, in the same directory as the detached label file. Below is a list of the possible formats that use the ^object keyword. ^object = n ^object = n ^object = ("filename.ext",n) ^object = ("[dirlist]filename.ext",n) ^object = ("filename.ext",n) ^object = ("[dirlist]filename.ext",n) where n is the starting record or byte number of the object, counting from the beginning of the file (record 1, byte 1); default is record number. indicates that number given is in units of bytes. filename upper-case file name. ext upper-case file extension. dirlist* period-delimited path-list of parent directories, in upper case, that specifies the object file directory (used only when the object is not in the same directory as the label file). * All PDS labels on this volume are located in the same directory as the file they describe so this construct is not used here. In cases where many files of the same format or structure are present, the structure description component may optionally be detached from the primary label. This minimizes repeating information which does not vary from file to file. In these cases, a format file (.FMT) contains the file structure information and the base label (.LBL) describes the parameters which generally do vary from file to file (number of records, file name, start/stop time, etc.). When a format file is used within the PDS label, the syntax is: ^STRUCTURE = filename Example: ^STRUCTURE = "EDRHDR.FMT" Syntactically, the contents of the format file can be inserted directly into the base label such that the entire file contents replace the single line ^STRUCTURE = filename. ============================================================================== Errata ============================================================================== There is a file called ERRATA.TXT found at the root level of this volume which contains a list of known deficiencies or caveats associated with data on this volume. This file will be updated if any new changes or errors are found. If you find an error on this volume, please report the error to the PDS Operator at the PPI Node of the PDS. Internet pds_operator@igpp.ucla.edu Telephone (310) 206-6073 U.S. Mail PDS Operator c/o Dr. Raymond Walker UCLA - IGPP Los Angeles, CA 90095-1567 Only through support and feedback of the users of these data can an effective errata list be maintained. ============================================================================== Software ============================================================================== There is no software provided with these data at this time. ============================================================================== Volume Contents and Structure ============================================================================== This section describes the volume structure and naming conventions. Below is a tree diagram of the volume, followed by a description of the directory function and key files in each directory. MGS_MAG_HIGH_RES (root directory) | |- AAREADME.TXT Describes volume contents, organization and volume use | (this file). | |- ERRATA.TXT Describes known deficiencies or caveats in the data or | on this volume. | |- VOLDESC.CAT High-level description of volume contents. | |- [CATALOG] Information on the data set and how it is processed | and produced. Also contains information regarding | Mars Global Surveyor, the MAG instrument, personnel | involved, and pertinent literature references. | |- [DATA] Contains all data in a branching tree structure of | | subdirectories corresponding to mission subphases | | or other convenient time periods. | | (New subdirectories will be added as the PDS | | acquires more data; hence the DATA directory may | | contain more subdirectories than are shown here.) | | | |- [AB1] | | | |- [SPO1] | | | |- [SPO2] | | | |- [AB2_AND_TTM] | | | |- [MAP1] | | | | ... ============================================================================== Contacts ============================================================================== For questions or problems regarding this volume, please contact the PDS/PPI PDS operator: Internet pds_operator@igpp.ucla.edu Telephone (310) 206-6073 U.S. Mail PDS Operator c/o Dr. Raymond Walker 3845 Slichter Hall UCLA - IGPP Los Angeles, CA 90095-1567 For questions regarding PDS Standards or other data available from the PDS, please contact PDS Operator at the PDS Engineering Node (at JPL): Internet pds_operator@jpl.nasa.gov Telephone (818) 354-4321 U.S. Mail Planetary Data System, PDS Operator Jet Propulsion Laboratory Mail Stop 168-400 4800 Oak Grove Dr. Pasadena, CA 91109-8099 The PDS, and the Planetary Plasma Interactions (PPI) Node in particular, assume no legal liability for errors on this volume. All users are encouraged to verify the "correctness" of the data prior to submitting any publications or other work based on these data. Errors on this volume should be reported back to the PPI Node of the PDS through the ERRATA reporting procedures described above.