PDS_VERSION_ID = PDS3
DATA_SET_ID = "ODY-M-MAR-3-RDR-CALIBRATED-DATA-V1.0"
RECORD_TYPE = STREAM
OBJECT = TEXT
PUBLICATION_DATE = 2014-08-11
NOTE = "Errata: known errors/anomalies in volumes"
END_OBJECT = TEXT
END
Non-Standard Practices
The PDS standards do not specify where to store the required MD5 checksum
file for a volume. We have placed it in the root directory of the volume
with the file name "CHECKSUMS.TXT". This may be considered invalid by some
verifiers.
ERRATA.TXT - Contains text information describing errors and/or anomalies
found in the current dataset as well as errors and/or anomalies found in
previous volumes of a volume set.
Note 2022-02-23: The MARIE instrument stopped collecting data on October 28,
2003, probably as a result of particle radiation damage caused by a solar
radiation event.
Note 2014-08-11: Minor updates to the entire dataset, including changing
keyword SPACECRAFT_NAME to INSTRUMENT_HOST_NAME, correcting instrument value
in several labels from MARTIAN RADIATION ENVIRONMENT EXPERIMENT to
MARS RADIATION ENVIRONMENT EXPERIMENT and adding certification status to
VOLDESC.CAT.
Note 2009-02-06: The volumes named ODMA_* are the disk volumes on which the
MARIE data originally were archived. The present unified archive
contains data from both of these volumes. The original volumes
contained both the raw and the calibrated data; hence these errata
cover both of these data sets.
Volume Error/Variance Description
-----------------------------------------------------------------------
All IMPORTANT WARNINGS REGARDING TIME VALUES AND DATA FILE CONTENTS:
ODMA_0xxx
volumes Some of the raw (REDR) data files contain errors in the
time column. These errors include apparent reversals of
time sequence (due to out-of-sequence time tags), bad values
of the year, and instances in which the onboard clock did
not roll over to the next day at midnight. These errors
reflect known behaviors of the onboard clock; they are not
the results of any fault in data set preparation. In
addition, the data files may contain some blocks of records
with repeated data. Users who encounter a time reversal in the
data should be alert to the possibility that a repeated block
of data is beginning, though not all time reversals are
due to this cause.
To help users identify and work around these problems,
the following items have been placed in the reduced (RDR)
data files:
(1) A corrected time column. This is an altered version
of the original time column, which also is present in
the reduced data. The original time column is only
minimally corrected. The corrected time column represents
the result of efforts to compensate for known errors in
the original time column. The corrected time column is
not guaranteed to be entirely correct. Both time columns
should be used critically and with caution.
(2) A column of flag values describing problems in the
in the time tags or elsewhere in the data. Details
on this column are found in the *.FMT files that
accompany the data. The second digit of this flag
column indicates time reversals. If this digit is
1, then the record either has a time reversal, or
occurs within about 10 records after a record with
a time reversal. Note that there may be some problems
which these flag values do not indicate.
(3) Flag values that replace bad values of the year or day
in the uncorrected time. (See the *.FMT files
accompanying the data for further details.)
A few files may lack some of these features (see below).
The out-of-sequence time tags have been left in place in the
reduced data. This seemed the best policy, since correction
or removal of these records might lead to data loss. The
great majority of records are not time-reversed with respect
to the preceding record.
In time tags with flag values for the uncorrected year,
the rest of the time tag should be regarded as being of
unknown quality.
Because of the possibility of time tag problems, users should
exercise care when interpreting the time values and when
utilizing the time order of any data file or combination
of data files.
There may be a few files to which the time tag correction
and flagging was not applied, because of uncertainty about
the correct interpretation of the time tags. Such files
will be noted separately in this ERRATA file.
For further information, please see the file
/DATA/REDUCED/INFO.TXT.
OTHER IMPORTANT NOTICES REGARDING THE DATA AND THE DISKS:
Before the current release of the reduced data, there
were earlier releases, some of which had different
data formats, calibration, and file names. The present
release should not be confused with any earlier version of
the reduced data.
Please note that the formats of the reduced data files
(under /DATA/REDUCED) may not quite conform to the format
described in the DATASET.CAT and the VOLSIS.* document.
Specifically, these reduced data files contain a new
extra time column and a flag column, as described above.
These extra columns are explained in the text file
/DATA/REDUCED/INFO.TXT and in the EVT_RDR.FMT files
accompanying the data files. They also are explained
in /CATALOG/CALIBRATED_DATASET.CAT.
Some of the documents in the DOCUMENT directory exist in
a PDF version but not in an ASCII version. This exception
to PDS standards was permitted because of the infeasibility
of converting the original PDF documents to ASCII format.
The INDEX.TAB and MANIFEST.TAB files in the current online
volume may not be up to date or may be missing. They will
be updated in later releases of the disk.
The current release of the disk does not contain the raw
data reading software described in some documents on
the disk.
ODMA_0001 The raw and ancillary data directories in ODMA_0001 contain
a few data files whose names indicate dates in January 2003.
These files contain 2002 data, but have filenames indicating
2003 dates because of the file naming conventions for
raw and processed data. (See the INFO.TXT files under
the /DATA/RAW_DATA and /DATA/ANCIL directories for details on
these file naming conventions.) These files have been
placed in the 02_12DEC subdirectories with the December
2002 data.
ODMA_0001 A small number of raw and ancillary data files in the
and December 2002 subdirectories cover periods crossing
ODMA_0002 the 2002-2003 year boundary. These files have been
included on both disks (ODMA_0001 and ODMA_0002).
ODMA_0002 The time tags in the reduced data files EVN03247_000627.TAB,
EVN03248_000000.TAB, and EVN03249_000007.TAB (all located
in DATA/REDUCED/03_09SEP) have not been substantially
corrected or flagged. The time interval of the raw data file
from which these files originated appears to overlap the time
intervals of other files; the correct interpretation of
the time tags in these three files remains uncertain. In
these three files, the corrected time column still exists
but contains no (or few) corrections.
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