Name Last modified Size Description
Parent Directory -
browse/ 28-Mar-2005 13:09 -
aareadme.txt 28-Mar-2005 13:09 15K
PDS_VERSION_ID = PDS3
RECORD_TYPE = FIXED_LENGTH
RECORD_BYTES = 80
SPACECRAFT_NAME = NEAR
OBJECT = TEXT
PUBLICATION_DATE = 2000-09-06
NOTE = "AAREADME.TXT File for data set:
NEAR-A-MSI-2-EDR-EROS/ORBIT-V1.0"
END_OBJECT = TEXT
END
NEAR Mission MULTISPECTRAL (MSI) IMAGER Data Set
========================================================================
Introduction
============
This document provides an overview of this volume of this Near Earth
Asteroid Rendezvous (NEAR) Uncalibrated Data Set, including a summary
of the volume contents.
The NEAR Science Data Center (SDC) archives NEAR uncalibrated science
data to 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).
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 and all supporting directories.
The data sets may span multiple volumes. Only the first volume in the set
contains the /DOCUMENT directory. The GEOMETRY data containing the SPICE
ephemerides, attitude and other files are delivered in a separate data set
covering the same phase.
This data set 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
=============
This volume has been formatted according to the ISO-9660 level 2
Interchange Standard.
This volume does not contain any Extended Attribute Records (XAR).
Thus, some VAX/VMS users may have problems accessing files on this
volume.
File Formats
============
The data files are presented in both the PDS and FITS form. In the
latter case, a FITS to PDS translator program (F2P) has been used to
create the detached PDS labels for each corresponding FITS file. All
document files and most labels contain an 80-byte fixed length record,
with a carriage return (ASCII 13) and line feed (ASCII 10) as the 79th
and 80th byte respectively. This allows the files to be read by
MS-DOS/Windows, Unix, and VMS operating systems. All the tabular files
in the INDEX and DOCUMENT directory are formatted according to PDS
standards. It should be noted that the index tables are formatted so
that they may be read directly into many database management systems.
All fields are separated by commas, and character fields are inclosed in
double quotes (").
Volume Contents
===============
Files on this volume are organized into a set of subdirectories
below the top-level directory. The following table shows the
structure of these directories. See the *INFO.TXT files in each directory
in each directory for specific information on the files in the directory.
Volume 1 directory structure:
|-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.
|-CALIB----|-MSIBANDPASS-
|-CATALOG--
|
| |-INSTRUMENT--|-MSIPLANS---
|-DOCUMENT-|
| |-MISSION-----|-OVERVIEW---
| |-TECHDIGEST-
|
|-GEOMETRY-
|-INDEX----
Volume 2-n directory structure
|-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.
|-BROWSE----
|-DATA-----
|-INDEX----
Directory Name Description
-----------------------------
BROWSE The directory will contain subdirectories YYYY/DOY which will
contain the .GIF files for that day. These files are made up of
up to 54 "thumbnail", reduced-size, geometrically rectified
images scaled in brightness from the minimum to maximum value in
the image. This provides at a glance an overview of the images
taken on that day. If more than 54 images were taken, there will
be multiple .GIF files, depending on the number of images.
The corresponding labels are also found in these subdirectories.
CALIB Calibration tables and corresponding labels for the instrument
when available.
CATALOG Templates for the mission, instrument host, instrument,
and data set.
DATA Instrument FITS data files and data labels. The data files
parameter definitions are in the
/DOCUMENT/INSTRUMENT/MSIDEFINITIONS.TXT file.
DOCUMENT Documentation of the instrument and SPICE in
ASCII text, PostScript, and PDF format. Documentation of the
NEAR mission including an overview in ASCII text, PostScript,
MS/Word, and PDF format. Articles from the Johns Hopkins
APL Technical Digest for the NEAR mission in PDF format. The
instrument subdirectory contains documentation describing the
instrument and the calibration of instrument data.
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 parameter values.
Mission Phase Parameters
----------------------------------------------------------------------
Phase Name Segment Start Year, End Year, Length (days)
(Phase DayOf Year DayOf Year
Abbrv)
----------------------------------------------------------------------
CRUISE1 CRU1 1996051 1997175 491
MATHILDE MATH 1997176 1997178 3
CRUISE2 CRU2 1997179 1998022 209
EARTH ERTH 1998023 1998026 4
CRUISE3 CRU3 1998027 1998356 330
EROS/FLY/BY ERFB 1998357 1998357 1
CRUISE4 CRU4 1998358 2000010 383
EROS/ORBIT EROS 2000011 2001043 399
EROS/SURFACE ERSF 2001044 2001059 16
----------------------------------------------------------------------
Whom to Contact for Information
===============================
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