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PDS_VERSION_ID = PDS3
RECORD_TYPE = STREAM
DATA_SET_ID = "RO-C-VIRTIS-2-PRL-MTP007-V1.0"
OBJECT = TEXT
PUBLICATION_DATE = 2016-05-27
NOTE = "General overview of the ROSETTA VIRTIS
PRL-MTP007 data set"
END_OBJECT = TEXT
END
VIRTIS STANDARD DATA ARCHIVE
1. Overview
This volume contains VIRTIS Standard Data Products from observations
acquired by the Visual Infrared Thermal Imaging Spectrometer (VIRTIS)
on Rosetta during the Prelanding phase of the mission.
More details can be found in DATASET.CAT, TARGET.CAT.
The VIRTIS (Visible Infra Red Thermal Imaging Spectrometer) instrument
combines a double capability: (1) high-resolution visible and infrared
imaging in the 0.25-5 micron range at moderate spectral resolution
(VIRTIS-M channel) and (2) high-resolution spectroscopy in the 2-5 micron
range (VIRTIS-H channel). The two channels will observe the same comet
areas in combined modes to take full advantage of their
complementarities.
VIRTIS-M (named -M in the following) is characterized by a single optical
head consisting of a Shafer telescope combined with an Offner imaging
spectrometer and by two two-dimensional FPAs: the VIS (0.25-1 micron)
and IR (1-5 micron). VIRTIS-H (-H) is a high-resolution infrared
cross-dispersed spectrometer using a prism and a grating. The 2-5 micron
spectrum is dispersed in 8 overlapping orders on a focal plane detector
array.
There is only one type of product for each channel, raw records (EDR),
stored as multi-spectral data QUBES with attached labels. Measurements
are provided as DN per spectral channel in the Qube objects, with
housekeeping parameters in the sideplanes. Data from the three focal
planes are stored in separate files. The logical object Qube is composed
of a data area and an attached label. The data area is composed of a
3-dimension matrix containing science measurements (the core) and a
sideplane containing the housekeepings.
Calibration files and all the relevant information on the calibration
process is also provided in the data set.
The VIRTIS Data directory is split into three subdirectories, one for
each focal plane:
/data/VIRTIS_M_VIS: contains VIRTIS-M VIS channel cubes
/data/VIRTIS_M_IR: contains VIRTIS-M IR channel cubes
/data/VIRTIS_H: contains VIRTIS-H channel cubes
Data products archived in this volume are copies of files maintained
and released by the VIRTIS team. Supporting documentation and labels
conform to the Planetary Data System (PDS) Standards Reference, Version
3.6, Jet Propulsion Laboratory (JPL) document JPL D-7669 (8/03/2003)
and the Planetary Science Data Dictionary, JPL document JPL D-7116,
(7/27/2001).
2. File Formats
This section provides a brief description of the files and data
objects available on the VIRTIS archive volumes: text files, PDF
files, and PDS objects such as LABELs, QUBEs,and TABLEs. A complete
description of each file format is available in the DOCUMENT/RO_VIRTIS_EAICD
on each archive volume.
All text and detached PDS label 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 MS-DOS/Windows,
Unix, and VMS operating systems.
Documents that contain formatting and figures that cannot be rendered
as ASCII text are provided as PDF files. The PDF (Portable Document
Format) file is a proprietary format of Adobe Systems Incorporated that
can be viewed using the free Acrobat Reader software.
A PDS label, whether embedded or detached from its associated file,
provides descriptive information about the associated file. All PDS
labels in the VIRTIS Standard Data Archive conform to PDS standards
[Planetary Science Data Dictionary, 2005; PDS Standards Reference, 2003].
For examples of the PDS labels used with each type of data product, see
the DOCUMENT/RO_VIRTIS_EAICD text on each archive volume. In general, the
PDS label is an object-oriented structure consisting of sets of 'keyword
= value' declarations; the object which the label refers is denoted by
a statement of the form:
^object = location
in which the carat character (^, also called a pointer in this context)
indicates where to find the object. In an embedded label, the location
is an integer representing the starting record number of the object (the
first record in the file is record 1). In a detached label, the location
denotes the name of the file containing the object, along with the
starting record or byte number, if there is more than one object in the
file. For example:
^HEADER = ("F01.IMG",1)
^TABLE = ("T01.TAB",1025 <BYTES>)
indicates that the TABLE object begins at byte 1025 of the file T01.TAB,
in the same directory as the detached label file. Below is a list of the
possible formats for the ^object definition.
^object = n
^object = n<BYTES>
^object = "filename.ext"
^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), <BYTES> indicates that
the number given is in units of bytes, filename is up to 8 characters,
alphanumeric upper-case file name, ext is the 3 character upper-case file
extension, and dirlist is a 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). The list begins at the directory level below the root directory.
'[dirlist]' may be omitted when the object being described is located
either in the same directory as the detached label or in a subdirectory
named LABEL that is located in a higher level of the directory tree
(typically root itself).
VIRTIS raw records are stored in PDS QUBE objects as defined in the PDS
Standards Reference [2003]. A QUBE is a three-dimensional array of
binary data values in two spatial dimensions (samples and lines) and one
spectral dimension (bands). VIRTIS QUBEs always include an attached PDS
label and SUFFIX data planes.
3. Applicable Software
VIRTIS qubes can be read and managed with an IDL package written and
maintained by S. Erard that can be found in the directory DOCUMENT. In
the same directory can be found a manual explaining how to use this
package (VIRTIS_PDS_IDL_SW_MANUAL).
4. Volume Contents
Files on the VIRTIS archive volume are organized into a series of
subdirectories below the top-level directory. See the xxxxINFO.TXT files
in each directory for specific information on the files in the directory.
The following table shows the generalized structure and contents of the
VIRTIS archive volumes. In this table, lowercase s's and n's used as
placeholders for spacecraft clock reset number and integer part of
acquisition spacecraft clock start count.
Top-level directory
| ------ AAREADME.TXT
| ------ VOLDESC.CAT
| ------ ERRATA.TXT
| ------ CALIB
| | ----- DEADPIXELMAP.DAT
| | ----- VIRTIS_M_VIS_RESP_10_V1.DAT
| | ----- VIRTIS_M_IR_RESP_10_V1.DAT
| | ----- VIRTIS_M_HRES_SPECAL_10_V1.TAB
| | ----- VIRTIS_M_NRES_SPECAL_10_V1.TAB
| | ----- VIRTIS_H_SPECTRAL_COEF_V1.TAB
| | ----- VIRTIS_H_SPECTRAL_WIDTH_V1.TAB
| | ----- VIRTIS_H_TRANSFERT_FCT_V1.TAB
| | ----- VIRTIS_RESAMPLED_IR_HIGH.TAB
| | ----- VIRTIS_RESAMPLED_VIS_HIGH.TAB
| | ----- VIRTIS_RESAMPLED_IR_NOM.TAB
| | ----- VIRTIS_RESAMPLED_VIS_NOM.TAB
| | ----- HSOLEILROS2014.TAB
| | ----- DEADPIXELMAP.LBL
| | ----- VIRTIS_M_VIS_RESP_10_V1.LBL
| | ----- VIRTIS_M_IR_RESP_10_V1.LBL
| | ----- VIRTIS_M_HRES_SPECAL_10_V1.LBL
| | ----- VIRTIS_M_NRES_SPECAL_10_V1.LBL
| | ----- VIRTIS_H_SPECTRAL_COEF_V1.LBL
| | ----- VIRTIS_H_SPECTRAL_WIDTH_V1.LBL
| | ----- VIRTIS_H_TRANSFERT_FCT_V1.LBL
| | ----- VIRTIS_RESAMPLED_IR_HIGH.LBL
| | ----- VIRTIS_RESAMPLED_VIS_HIGH.LBL
| | ----- VIRTIS_RESAMPLED_IR_NOM.LBL
| | ----- VIRTIS_RESAMPLED_VIS_NOM.LBL
| | ----- HSOLEILROS2014.LBL
| | ----- CALIBINFO.TXT
| ------ CATALOG
| | ----- CATINFO.TXT
| | ----- INST.CAT
| | ----- INSTHOST.CAT
| | ----- MISSION.CAT
| | ----- PERSON.CAT
| | ----- REF.CAT
| | ----- SOFTWARE.CAT
| | ----- TARGET.CAT
| | ----- DATASET.CAT
| ------ DATA
| | ----- VIRTIS_M_VIS
| | | ----- Vs_nnnnnnnn.QUB
| | ----- VIRTIS_M_IR
| | | ----- Is_nnnnnnnn.QUB
| | ----- VIRTIS_H_
| | | ----- Hs_nnnnnnnn.QUB
| | |----- Ss_nnnnnnnn.QUB
| | |----- Ts_nnnnnnnn.QUB
| ------ DOCUMENT
| | ----- RO_VIRTIS_EAICD.LBL
| | ----- RO_VIRTIS_EAICD.PDF
| | ----- DOCINFO.TXT
| | ----- RO_VIRTIS_EAICD.ASC
| | ----- VIR_M_CAL_UM.ASC
| | ----- VIRTIS_H_CALIBRATION.LBL
| | ----- VIRTIS_H_CALIBRATION.PDF
| | ----- VIRTIS_H_CALIBRATION.ASC
| | ----- VIR-IAS-TN-026_ISSUE1.LBL
| | ----- VIR-IAS-TN-026_ISSUE1.PDF
| | ----- VIR-IAS-TR-010_ISSUE2.LBL
| | ----- VIR-IAS-TR-010_ISSUE2.PDF
| | ----- VIR-IAS-TR-027_ISSUE1.LBL
| | ----- VIR-IAS-TR-027_ISSUE1.PDF
| | ----- VIRTIS_EXP_USER_MANUAL.LBL
| | ----- VIRTIS_EXP_USER_MANUAL.PDF
| | ----- VIRTIS_M_CALIBRATION_REPORT.ASC
| | ----- VIRTIS_M_CALIBRATION_REPORT.LBL
| | ----- VIRTIS_M_CALIBRATION_REPORT.PDF
| | ----- VIRTISROS_GEOMETRY.PDF
| | ----- VIRTIS_PDS_IDL_SW_MANUAL.LBL
| | ----- VIRTIS_PDS_IDL_SW_MANUAL.PDF
| | ----- IMAGE001.PNG
| | ----- IMAGE002.PNG
| | ----- IMAGE003.PNG
| | ----- IMAGE004.PNG
| | ----- IMAGE005.PNG
| | ----- IMAGE006.PNG
| | ----- IMAGE007.PNG
| | ----- IMAGE008.PNG
| | ----- IMAGE009.PNG
| | ----- IMAGE010.PNG
| | ----- IMAGE011.PNG
| | ----- IMAGE012.PNG
| | ----- IMAGE013.PNG
| | ----- IMAGE014.PNG
| | ----- IMAGE015.PNG
| | ----- IMAGE016.PNG
| | ----- IMAGE017.PNG
| | ----- IMAGE018.PNG
| | ----- IMAGE019.PNG
| | ----- IMAGE020.PNG
| | ----- IMAGE021.PNG
| | ----- IMAGE022.PNG
| | ----- IMAGE023.PNG
| | ----- IMAGE024.PNG
| | ----- IMAGE025.PNG
| | ----- IMAGE026.PNG
| | ----- IMAGE027.PNG
| ------ EXTRAS
| | ----- CODE
| | | ----- VIRTISPDS.LBL
| | | ----- VIRTISPDS.ZIP
| ------ INDEX
| | ----- INDXINFO.TXT
| | ----- INDEX.LBL
| | ----- INDEX.TAB
5. Whom to Contact for Information
For questions concerning this data set:
Maria Teresa Capria
INAF - IAPS
Area Ricerca Tor Vergata
via del Fosso del Cavaliere, 100
00133 Roma, Italy
Electronic mail address: mariateresa.capria@iaps.inaf.it
Romolo Politi
INAF - IAPS
Area Ricerca Tor Vergata
via del Fosso del Cavaliere, 100
00133 Roma, Italy
Electronic mail address: romolo.politi@iaps.inaf.it
Gianrico Filacchione
INAF - IAPS
Area Ricerca Tor Vergata
via del Fosso del Cavaliere, 100
00133 Roma, Italy
Electronic mail address: gianrico.filacchione@iaps.inaf.it
For questions concerning the IDL software:
Stephane Erard
LESIA - Observatoire de Paris-Meudon
Place J. Janssen
F-92 195 Meudon Cedex, France
Electronic mail address: stephane.erard@obspm.fr
6. Cognizant Persons
The data sets were prepared by M.T. Capria, R. Politi, and G. Filacchione,
all at INAF - Area di Ricerca di Tor Vergata, Rome, Italy. with the help of
F. Henry and S. Jacquinod at Observatoire de Paris, Meudon France