PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2010-08-05 NOTE = "AAREADME.TXT describes this archive product." END_OBJECT = TEXT END Volume MGS_ER_MARS_MAP Electron Reflectometry Map of Mars based on data from Mars Global Surveyor Planetary Plasma Interactions Discipline Node of the Planetary Data System ============================================================================= Introduction ============================================================================= This data volume contains an electron reflectometry map of the Martian magnetic field, derived from data from the Electron Reflectometer (ER) instrument aboard the Mars Global Surveyor (MGS) spacecraft. 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. ============================================================================= Brief Volume Description ============================================================================= The electron reflectometry map is an ASCII tabular file. It is stored in the "DATA" directory. 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 ER instrument (ER_INST.CAT), the MGS mission (MISSION.CAT) and spacecraft (MGS_HOST.CAT), relevant personnel, and useful literature references. The data file in this volume is described by a detached PDS label (.LBL), which is stored with the data file. 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 file on this volume is an ASCII text file. The data file is described by a detached PDS label. 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. ============================================================================= Errata ============================================================================= There may be 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. Email 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. ============================================================================= 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. (File present if needed.) | |- 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 ER instrument, personnel | involved, and pertinent literature references. | |- [DATA] Contains all data. ============================================================================= Contacts ============================================================================= For questions or problems regarding this volume, please contact the PDS/PPI PDS operator: Email 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): Email 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.