PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM DATA_SET_ID = "RO-C-VIRTIS-5-67P-MAPS-V1.0" DATA_SET_NAME = "ROSETTA-ORBITER 67P VIRTIS 5 MAPS V1.0" OBJECT = TEXT PUBLICATION_DATE = 2019-10-03 NOTE = "General overview of the ROSETTA VIRTIS Derived Data data set" END_OBJECT = TEXT END VIRTIS STANDARD DATA ARCHIVE 1. Overview This volume contains VIRTIS Derived Data Products from the elaboration of the Team of the Visual Infrared Thermal Imaging Spectrometer (VIRTIS) on ESA Rosetta mission Team during all the phases of the mission. More details can be found in DATASET.CAT, TARGET.CAT. The Data directory is structured as the following schema: /DATA |- MAP |- VIRTIS_M: contains maps derived from VIRTIS-M data cubes |- VIRTIS_H: contains maps derived from VIRTIS-H data cubes (not used) 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 and TABLEs A complete description of each file format is available in the DOCUMENT/RO_VIRTIS_MAP_EAICD in the 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_MAP_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 ) 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 ^object = "filename.ext" ^object = ("filename.ext",n) ^object = ("[dirlist]filename.ext",n) ^object = ("filename.ext",n) ^object = ("[dirlist]filename.ext",n) where n is the starting record or byte number of the object, counting from the beginning of the file (record 1, byte 1), 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 Derived Data are stored in PDS TABLE objects as defined in the PDS Standards Reference [2003]. A TABLE is an object in which the record is the raw and the field is the cell. The information is stored in ASCII format. Each file have a peculiare structure and the description of each record and field is reported in the header. 3. Applicable Software VIRTIS Derived Data are in ASCII standard format with field in fixed length. In particular the data format is a CSV. Data can be read using any text editor or from spread sheet that support the CSV file format. 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 | ------ CATALOG | | ----- CATINFO.TXT | | ----- INST.CAT | | ----- INSTHOST.CAT | | ----- MISSION.CAT | | ----- PERSON.CAT | | ----- REF.CAT | | ----- SOFTWARE.CAT | | ----- TARGET.CAT | | ----- DATASET.CAT | ------ DATA | | ----- MAP | |----- VIRTIS_M | |-- xxxxx.TAB | |-- xxxxx.LBL | ------ DOCUMENT | | ----- RO_VIRTIS_MAP_EAICD.LBL | | ----- RO_VIRTIS_MAP_EAICD.PDF | | ----- DOCINFO.TXT | | ----- RO_VIRTIS_MAP_EAICD.ASC | ------ INDEX | | ----- INDXINFO.TXT | | ----- INDEX.LBL | | ----- INDEX.TAB 5. Whom to Contact for Information For questions concerning this data set: Romolo Politi INAF - IAPS Area Ricerca Tor Vergata via del Fosso del Cavaliere, 100 00133 Roma, Italy Electronic mail address: romolo.politi@inaf.it APPENDIX A. File Extensions ASC - Document in standard ASCII format; CAT - PDS3 catalog file in ASCII format; CSV - Comma Separated Values file format; LBL - Detached label file; PDF - Document in Portable Document Format file format; PNG - Portable Network Graphics image format; TAB - Data in ASCII Table format; TXT - Document in text format;