Name Last modified Size Description
Parent Directory -
calib/ 02-Aug-2004 10:20 -
aareadme.txt 02-Aug-2004 10:19 15K
PDS_VERSION_ID = PDS3
RECORD_TYPE = STREAM
SPACECRAFT_NAME = NEAR
OBJECT = TEXT
PUBLICATION_DATE = 2001-08-31
NOTE = "AAREADME.TXT File for data set:
NEAR-A-MSI-3-EDR-MATHILDE-V1.0"
END_OBJECT = TEXT
END
NEAR Mission MULTISPECTRAL IMAGER (MSI) Data Set
========================================================================
Introduction
============
This document provides an overview of this volume of this Near Earth
Asteroid Rendezvous (NEAR) Calibrated Data Set, including a summary
of the volume contents.
The NEAR Science Data Center (SDC) archives NEAR calibrated 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. The GEOMETRY data containing the
SPICE ephemerides, attitude and other files are delivered in a separate
data set.
This data set is a part of the NEAR level 2 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.
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
============
All text documents and other meta information files such as
descriptions, PDS object definitions and detached PDS labels have 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 MS-DOS/Windows, Unix,
and VMS operating systems. Data files are all FITS (definition/reference)
files.
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
for specific information on the files in the directory.
Volume 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--- (not on volume 1)
|-CALIB---- (only on volume 1)
|-CATALOG--
|-DATA----- (not on volume 1)
|-DOCUMENT-
|-GEOMETRY- (only on volume 1)
|-INDEX----
A more detailed directory structure appears below:
Volume 1 directory structure:
|-CALIB----|-MSIBANDPASS-
|-CATALOG--
|-DOCUMENT-|-INSTRUMENT------
| |-OBSERVATION_LOG-
|-GEOMETRY-
|-INDEX----
Volume 2-n directory structure
|-BROWSE---
|-CATALOG--
|-DATA-----
|-DOCUMENT-
|-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 The image data is provided in raw and calibrated versions.
The calibrated images are provided in either units of I/F
(images of resolved bodies) or radiance (images of point
or near-point sources) and have been corrected for dark
current and flat field. The data is organized by year,
day of year, and level of calibration.
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
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
Scott L. Murchie
The Johns Hopkins University
Applied Physics Laboratory
11100 Johns Hopkins Road
Laurel MD 20723
Email: scott.murchie@jhuapl.edu