Index of /volume/nmcru1_0001
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aareadme.txt 04-May-2002 03:23 31K
errata.txt 04-May-2002 03:23 5.4K
voldesc.cat 04-May-2002 03:23 4.7K [PDS catalog file]
PDS_VERSION_ID = PDS3
RECORD_TYPE = STREAM
OBJECT = TEXT
PUBLICATION_DATE = 2002-03-30
NOTE = "AAREADME.TXT describes this archive product."
END_OBJECT = TEXT
END
Volume NMCRU1_0001
Near Earth Asteroid Rendezvous
Magnetometer
Uncalibrated (EDR) Data Archive
CRUISE1 Phase
Planetary Plasma Interactions Discipline Node
of the
Planetary Data System
==============================================================================
Introduction
==============================================================================
This disk contains the CRUISE1 phase uncalibrated data (Experiment Data
Record) from the Near Earth Asteroid Rendezvous (NEAR) Magnetometer
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.
For questions regarding data content, processing, or quality, please see
the contact information at the end of this document.
==============================================================================
Brief Disk Description
==============================================================================
This volume contains NEAR MAG data from the CRUISE1 phase of the
mission. This phase began on 02-20-1996 and ended on 06-24-1997.
The data are described by the file /CATALOG/MAGDATASET.CAT on this disk.
All data files are stored in the /DATA branch of the directory tree.
Each data file is located in the /DATA directory or in a subdirectory
beneath it. All data are stored in tables in FITS format, with attached
FITS headers.
The primary documentation for this volume is located in the CATALOG
directory. The data set is documented as part of the archive
(MAGDATASET.CAT); so are the instrument (MAGINST.CAT), the NEAR
mission (NEARMISSION.CAT), the NEAR spacecraft (NEARINSTHOST.CAT),
relevant personnel (PERSON.CAT), and useful literature references
(REF.CAT).
All data files on this CD-ROM are described by detached PDS labels
(*.LBL). Each detached label file contains information about the
corresponding data file, including descriptions of the columns if the
data file is tabular. 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 Set Information
==============================================================================
NEAR data sets contain data from only one instrument and one mission
phase. Mission phases for data sets are defined in the table below.
Each data set contains the data from a range of days, along with
supporting documentation for those data. In general, a data set may
span one or more volumes, but NEAR MAG EDR data sets span one volume
each.
Mission Phase Parameters (Planned Values; Feb. 2000)
--------------------------------------------------------------------
Segment Start (Year, End (Year, Length
Phase Name (Phase Abbrv) Day Of Year) Day Of Year) (Days)
--------------------------------------------------------------------
CRUISE1 CRU1 1996-051 1997-175 491
MATHILDE MATH 1997-176 1997-178 3
CRUISE2 CRU2 1997-179 1998-022 209
EARTH ERTH 1998-023 1998-026 4
CRUISE3 CRU3 1998-027 1998-356 330
EROS/FLY/BY ERFB 1998-357 1998-357 1
CRUISE4 CRU4 1998-358 2000-010 383
EROS/ORBIT EROS 2000-011 2001-043 399
EROS/SURFACE ERSF 2001-044 2001-059 16
--------------------------------------------------------------------
The NEAR Science Data Center (SDC) archives NEAR uncalibrated science
data at the Small Bodies Node (SBN) of the Planetary Data System (PDS),
as specified in the NEAR Project Archive Generation, Validation and
Transfer Plan (February 1998).
The data set on this disk is a part of the NEAR level 1b data set
delivery as described by the NEAR PDS Data Archive Plan. The Plan also
describes the higher level data products, which will become separate
PDS data sets.
The February 1998 Plan document is in the DOCUMENT subdirectory of this
data set, in the file PDSARCHIVEPLAN, in text (.TXT) and rich text
(.RTF) formats. The included plan is dated February 1998. It is expected
to be updated with final definitions of higher level products. The
revised plan will be included in later time periods of this data set.
==============================================================================
Volume Format Information
==============================================================================
The disk is organized into a hierarchical directory structure. The
disk is formatted according to the ISO-9660 Level 2 Interchange
Standard. This volume does not contain any Extended Attribute Records
(XAR). Thus, VAX/VMS users may have some problems accessing files on
this volume.
==============================================================================
File Formats
==============================================================================
The data files on this volume are in FITS format. 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. For example, the file MAG01050.FIT would be accompanied by the
detached label file MAG01050.LBL in the same directory. File names
within this archive conform with the ISO-9660 Level 2 standard.
All documents, detached PDS labels, and HTML files 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 will see an unnecessary carriage return character
(^M) at the end of each line. Mac users will see an unnecessary line
feed character (^J) at the start of each line.
ASCII tabular data files (*.TAB), including index files, are formatted
so that they may be read directly into many database management systems
(DBMS) or spreadsheet programs on various computers. All fields are of
fixed length and are separated by white space (blank characters or
commas). Character fields are left justified, and numeric fields are
right justified. The "start byte" and "bytes" values listed in a PDS
label do not include the white space between fields. The records are
of fixed length, and the last two bytes of each record contain the
ASCII carriage return and line feed characters. This allows a table
to be treated as a fixed length record file on computers that support
this file type and as a normal text file on other computers.
The document and PDS label files on this volume can be viewed with a
Web browser. Note that to view these files, the browser may need to
be configured to recognize files with extensions of .LBL and .TAB as
text files. Users with Web browsers also can navigate the disk via
the HTML file AAREADME.HTM in the disk's root directory and the HTML
files in the EXTRAS directory.
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 = ("MAG01050.FIT", 3)
indicates that the SERIES object begins at record 3 of the file
MAG01050.FIT, 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<BYTES>
^object = ("filename.ext",n)
^object = ("[dirlist]filename.ext",n)
^object = ("filename.ext",n<BYTES>)
^object = ("[dirlist]filename.ext",n<BYTES>)
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.
<BYTES> 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 is 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 at the time this CD was published. Any changes or
errors that are found on this or any NEAR MAG EDR CD-ROM after the
production of this volume can be found on a PPI Node errata Web page
(http://www.igpp.ucla.edu/public/pds/ERRATA/NEAR/EDR/ERRATA.TXT).
If you find an error on this disk, 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 are tree diagrams for the CD-ROMs, followed by descriptions of the
directory functions and of key files in each directory. Note that the
directory structures are different depending on whether the CD is the
first volume for a data set or is a subsequent (second, third,...)
volume. Because NEAR MAG EDR data sets span only one volume each,
each NEAR MAG EDR volume has the structure of the first volume for a
data set.
See the *INFO.TXT file in each directory for specific information on the
files in that directory.
Directory structure of the first volume for a data set:
|-AAREADME.TXT The text version of the AAREADME file.
|-ERRATA.TXT Text information describing data errors/anomalies.
|-VOLDESC.CAT Description of the contents of this volume.
|-CATALOG--
|-DATA-----
|
| |-INSTRUMENT-|-CALPAPER---
|-DOCUMENT-|
| |-MISSION----|-OVERVIEW---
| |-TECHDIGEST-
|-GEOMETRY-
|-INDEX----
Directory structure of later volumes for a data set:
|-DATA-----
|-INDEX----
Directory Name Description
-----------------------------
CATALOG Templates for the mission, instrument host, instrument,
and data set.
DATA Instrument FITS data files and data labels. The data file
parameter definitions are in the
/DOCUMENT/INSTRUMENT/MAGDEFINITIONS.TXT file.
DOCUMENT Articles from the Johns Hopkins APL Technical Digest
documenting the NEAR mission, the NEAR MAG instrument,
and the NEAR command and data handling system.
Documentation of the MAG data file parameter definitions
in ASCII text format. Documentation of the PDS archive
plan for the NEAR MAG data. Documentation of FITS format.
GEOMETRY This directory contains only a GEOMINFO.TXT file.
A separate GEOMETRY volume contains all of the SPICE kernels
in text transfer format for the mission phase and the
supporting documentation.
INDEX Index tables for this CD and the volume set describing times
and key data file properties.
In a multi-volume data set, only the first volume contains a DOCUMENT
directory. The GEOMETRY data containing the SPICE ephemerides, attitude
and other files are delivered in a separate data set covering the same
phase.
==============================================================================
Driver and Hardware Information
==============================================================================
This disk has been formatted according to the ISO standard for CD-ROM
production (9660) with level 2 compliance. Any system which complies
with this standard should be able to access this disk.
==============================================================================
Contacts
==============================================================================
Questions regarding data content, processing, or quality may be directed
to:
NEAR Science Data Center:
Douglas B. Holland
The Johns Hopkins University
Applied Physics Laboratory
11100 Johns Hopkins Road
Laurel MD 20723
Email: Douglas.Holland@jhuapl.edu
Howard W. Taylor
The Johns Hopkins University
Applied Physics Laboratory
11100 Johns Hopkins Road
Laurel MD 20723
Email: Howard.Taylor@jhuapl.edu
For questions or problems regarding this CD-ROM, please contact the PPI
Node 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
PPI Node personnel who may be aware of issues related to this CD-ROM
include Dr. Mark Sharlow, Mr. Steven Joy, and Dr. Raymond Walker.
For questions regarding PDS Standards or other CD-ROM's available from
the PDS, please contact PDS Operator at the PDS Central 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 202-101
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 disk. 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 disk
should be reported back to the PPI Node of the PDS through the ERRATA
reporting procedures described above.