DATA_SET_DESCRIPTION |
Data Set Overview
=================
The TES-TSDR data product contains the raw and calibrated
thermal IR radiance spectra, the visual and thermal bolometric
radiance measurements, and several atmospheric and surface
properties derived from this data. Also included are the
parameters that describe each observations, some downlinked
diagnostic information, and the pointing and positional
information derived from the project's SPICE kernels.
The TES data is divided into 10 tables (OBS, RAD, BOL, GEO,
POS, TLM, IFG, CMP, SRF, LMB). Each table is stored in a
separate file as a PDS TABLE structure, using fixed-length
binary records, with extensions to handle the variable length
spectra. Every record is stored with the spacecraft time, and
related records can be retrieved from each table using time as
a common key. In some tables, up to 6 records can be stored
for a given time, one for each detector. In these cases the
records also include a field named 'detector', which with the
time field, uniquely identifies the record.
The data products on this volume may be reprocessed at the end
of the Mapping Phase of the mission.
Data
====
Each table is stored in a PDS TABLE structure using
fixed-length binary records sorted time-sequentially. Each
table file is prefixed with an ASCII header that describes the
contents and format of the table, and a pointer that indicates
where the binary table data starts. The description identifies
each column in the table, detailing its name, starting position
(in bytes), size (in bytes), data type, description and scaling
factors if applicable. In some cases the column being
described is a fixed-length array of related, homogeneous
values, in which case the column description also includes the
number of items in the array, and the size of each item.
Four tables (RAD, SRF, CMP, IFG) store variable length data.
These variable length records are stored in a file separate
from the fixed length records, and are addressed from the
fixed-length records with a pointer column. Pointer columns
contain the position of the variable length data, in bytes,
from the start of the file it is in.
Fixed-length records are stored in files with a .DAT extension.
The variable length records that are referenced by an
individual .DAT file are found in a file with the same name,
but with a .VAR extension.
Coordinate System
=================
Mars areocentric, west positive
Software
========
The TES project has produced a software tool that not only
reads the PDS table and variable length records, but is also
capable of joining the related records among multiple tables.
This piece of software is called 'vanilla', and is provided
on this cd.
'Vanilla' is also available via anonymous ftp from
ftp://east.la.asu.edu/pub/software/vanilla/vanilla.tar.Z. The
vanilla program works on UNIX machines with integers in
MSB_INTEGER format and on PC platforms.
Media/Format
============
CD-ROM
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