PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2017-10-24 INTERCHANGE_FORMAT = ASCII NOTE = "Readme file for Cassini ISS Cartographic Map Volumes DVDs" END_OBJECT = TEXT END CASSINI IMAGING SCIENCE SUBSYSTEM CARTOGRAPHIC MAP VOLUMES COISS_3006 VOLUME 6: CASSINI ISS CARTOGRAPHIC MAP OF MIMAS AAREADME CONTENTS ----------------- 1. Introduction 2. DVD Format 3. DVD Contents 4. File Formats 5. Contact Information 6. Cognizant Persons & Acknowledgments --------------------------------------------------------------------- 1. Introduction Complementing the collection of raw Experiment Data Record (EDR) volumes and calibration volumes available from the Cassini Imaging Science Subsystem (ISS), this set of cartographic map products were generated by the ISS team members as an archivable second-order product. The Cassini ISS consists of two framing cameras. The narrow angle camera is a reflecting telescope with a focal length of 2000 mm and a field of view of 0.35 degrees. The wide angle camera is a refractor with a focal length of 200 mm and a field of view of 3.5 degrees. Each camera is outfitted with a number of spectral filters which, taken together, span the electromagnetic spectrum from 0.2 to 1.1 micrometers. At the heart of each camera is a charged coupled device (CCD) detector consisting of a 1024 square array of pixels, each 12 microns on a side. The camera system allows many options for data collection,including choices for on-chip summing and data compression. The Saturnian system has 47 (and counting) satellites of different sizes. However, these Cassini ISS cartographic mapping volumes include only include the medium-sized icy satellites Mimas, Enceladus, Tethys, Dione, Rhea, Iapetus, and Phoebe. One of the objectives of the ISS team is to obtain global coverage for all medium-sized icy satellites with a resolution better than 1 km/pixel and obtain high-resolution images. This goal is being achieved with image sequences obtained during close flybys supplemented by images from greater distances to complete the coverage. Close flybys of all medium-sized satellites except Mimas are planned during the nominal mission of the Cassini spacecraft. Table I below shows the actual dates and flyby altitude: Satellite Flyby Date Flyby Altitude [km] --------------------------------------------------- Phoebe 2004 JUN 11 2070 Iapetus 2004 DEC 31 123400 Enceladus 2005 FEB 17 1260 Enceladus 2005 MAR 09 500 Enceladus 2005 JUL 14 170 Mimas 2005 AUG 02 61150 Tethys 2005 SEP 24 1500 Hyperion 2005 SEP 26 500 Dione 2005 OCT 11 500 Rhea 2005 NOV 26 500 Iapetus 2007 SEP 10 1200 (planned) Enceladus 2008 MAR 12 100 (planned) Table I: Cassini flybys in 2004-2007 The cartographic maps were created from images taken by Cassini with a very small number of images from Voyager-1 and Voyager-2 used to fill in any gaps. Only images taken with CL1, CL2, and GRN filters were used. Images taken from all three missions are available online from the Planetary Data System (PDS) Imaging Node [http://pdsimaging.jpl.nasa.gov]. Imaging of the medium-sized icy satellites is ongoing and will continue until the end of the Cassini mission, making it possible to improve the image mosaics during the tour. The Cassini spacecraft will continue imaging throughout the tour mission. Satellite close flybys are scheduled for Tethys, Dione, Rhea, Iapetus, and Enceladus within the nominal tour mission ending in 2008. These data will be used to further improve the existing semi-controlled mosaics and maps and also to update or calculate initial global geodetic control networks of the Saturnian satellites for controlled orthophoto mosaics. The following labeling conventions are found on these mapping volumes: DATA_SET_ID = "CO-S-ISSNA/ISSWA-5-MIDR-V1.0" DATA_SET_NAME = "CASSINI ORBITER SATURN ISSNA/ISSWA 5 MIDR VERSION 1.0" VOLUME_SERIES_NAME = "MISSION TO SATURN" VOLUME_SET_NAME = "CASSINI ISS CARTOGRAPHIC MAP VOLUMES" VOLUME_SET_ID = USA_NASA_PDS_COISS_3XXX (where 3 = map and xxx = sequential numbering of the volumes) VOLUMES = 7 VOLUME_FORMAT = "UDF_ISO-9660_BRIDGE" MEDIUM_TYPE = "DVD-R" MISSION_NAME = "CASSINI-HUYGENS" SPACECRAFT_NAME = "CASSINI ORBITER" STANDARD_DATA_PRODUCT_ID = ISS_MIDR The data contained within these mapping volumes is considered CODMAC Level 5 processed (as indicated in DATA_SET_NAME). The definition for CODMAC Level 5 processing is described as: CODMAC Level 5 and NASA Level 2 - Geophysical parameters, generally derived from Level 1 data, and located in space and time commensurate with instrument location, pointing and sampling. CODMAC Level 5 and NASA Level 3 - Geophysical parameters mapped onto uniform space-time grids. GETTING STARTED To begin using the ISS cartographic map archive collection one should become familiar with the contents of the ROOT and DOCUMENT directories. These directories include files that provide important detailed descriptive information on the ISS instrument and the archive files and formats. For more information related specifically to the ISS EDR images, see the documentation provided on the ISS EDR volumes archived with the PDS. The files contained in the ROOT and DOCUMENT directories are found in various formats. File formats are described below in section 4. The 'data' directory contains the cartographic map sheets, the processed tile images used to create the cartographic map sheets, and a simple cyclindrical global mosaic image. See the file 'datainfo.txt' in the data directory for a description of the directory contents and naming conventions. For a detailed description of the processing used in creating these maps, see the file 'cartods.cat' in the catalog directory. For a detailed description of the map projections used in creating these maps, see the file 'dsmap.cat' in the catalog directory. Finally, the PDS Discipline Nodes are chartered to assist users with using the datasets they curate. Contact them for assistance if you find you have questions on getting started with using the Cassini image archive. --------------------------------------------------------------------- 2. DVD Format This DVD has been formatted so that a variety of computer systems may access the data. Specifically, it is formatted according to the ISO-9660 Level 2 Interchange Standard. For further information, refer to the ISO-9660 Standard Document: RF#ISO 9660-1988, April 15, 1988. VOLUME_FORMAT = UDF_ISO-9660_BRIDGE --------------------------------------------------------------------- 3. DVD Contents Files found on these ISS cartographic archive DVDs are organized into a series of subdirectories below the top-level directory. FILE CONTENTS -------------------- --------------------------- [ROOT] (Top level directory) |- aareadme.txt The file you are now reading. |- errata.txt Known anomalies and errors. |- voldesc.cat Contents description of this DVD volume. | |- [catalog] Directory with PDS catalog information about | | the Cassini ISS datasets. | |- catinfo.txt Description of files in the catalog directory. | |- cartods.cat Cartographic map dataset description. | |- dsmap.cat Description of map projections used. | |- issna_inst.cat Cassini ISS narrow angle camera description. | |- isswa_inst.cat Cassini ISS wide angle camera description. | |- insthost.cat Cassini Orbiter description catalog object. | |- mission.cat Mission description catalog objects. | |- person.cat Cassini Imaging personnel objects. | |- projref.cat Cassini project reference objects. | |- cartoref.cat Cassini project reference objects. | |- [data] Contains the EDR image data files and labels. | |- datainfo.txt Description of files in the data directory. | - [maps] Directory containing map sheets | - [images] Directory containing tile images and global mosaic. | |- [document] Directory containing document files. | |- docinfo.txt Description of files in document directory. | |- mapping_iss.pdf Mapping publication released by ISS Team (PDF). | |- mapping_iss.html Mapping publication released by ISS Team (HTML). | |- mapping_iss.lbl PDS detached label for mapping_iss document. | |- cartosis.lbl PDS detached label for the mapping SIS. | |- cartosis.pdf PDF version of the mapping SIS. | |- cartosis.txt TXT version of the mapping SIS | - [mapping_iss_images] Directory containing images for mapping_iss.html. | |- [index] Directory containing index files. | |- indxinfo.txt Description of files in the index directory. | |- img_cumindex.tab Cumulative index for /data/images/ PDS image files. | |- img_cumindex.lbl PDS label for the img_cumindex.tab. | |- img_index.tab Volume index for /data/images/ PDS image files. | |- img_index.lbl PDS label for the img_index.tab. | |- map_cumindex.tab Cumulative index for /data/maps/ PDF maps. | |- map_cumindex.lbl PDS label for the map_cumindex.tab | |- map_index.tab Volume index for /data/maps/ PDF maps. | |- map_index.lbl PDS label for the map_index.tab. | |- [label] Directory containing labels and include files. | |- labinfo.txt Description of label directory files. | |- vicar2.txt Description of VICAR Label. --------------------------------------------------------------------- 4. File Formats This section describes the file formats used for the types of files found on these cartographic map volumes: ASCII Text Files (.txt) ----------------------- A flat, human-readable ASCII text version of each document must be included on the volume. Also, adhering to PDS recommendations, plain text files have line lengths restricted to 78 characters or fewer in order to accommodate printing and display on standard devices. Each line is terminated by the two-character carriage-return/linefeed sequence, (ASCII decimal character codes 13 and 10, respectively), for a maximum total line length of 80 characters. Document .txt files are flat ASCII text files which may have embedded PDS labels (see PDS Label Formats below). PDF Files (.pdf) ---------------- The full cartographic mapping product for a particular target body consists of one or more cartographic map sheets. A map sheet will contain one or more images of different projections of the body. Also included on the map sheet is text information describing the index of original images used to make the map, image processing used, a summary of the map projections, references, and contact information. These map sheets are stored as PDF (Portable Document Format) files. Portable Document Format (PDF) is a proprietary format of Adobe Systems Incorporated that is frequently used for distributing documents. Adobe offers a free downloadable reader, Acrobat Reader, from their website at http://www.adobe.com. Be sure to download the latest version of Acrobat Reader to view the PDF files on the this volume. PDS VICAR Files (.IMG) ----------------------------- All tile images and the global mosaic image in the /data/images/ directory are in JPL/MIPS VICAR (Video Image Communication And Retrieval) image format. (See 'Software' section below for more information.) Each VICAR image file has an attached ASCII PDS label file. The label consists of ASCII 'keyword=value' pairs describing the important characteristics of the image. Index Files (.tab) ------------------ The index table files contain keyword information about each data product (images and maps) on the volume. This file consists of fixed-length records in ASCII character format. Each line is a record containing all the keywords for a particular data product on the volume. Fields in a record are delimited by commas. Non-numeric fields are enclosed in quotes and left-justified, whereas numeric fields are not enclosed by any characters and are right-justified. Multi-valued fields are enclosed in brackets and each item in that field is separated by a comma. The corresponding label files for each index file details the keyword name, data type, start byte, number of bytes, and format so that keywords can be easily referenced and the file can be properly read into a database. Catalog Files (.cat) -------------------- Catalog files (suffix .cat) exist in the catalog directory. They are text files formatted in an object-oriented structure consisting of sets of 'keyword=value' declarations. Each line is terminated by the two-character carriage-return/linefeed sequence, (ASCII decimal character codes 13 and 10, respectively). PDS recommends catalog files have line length restricted to 72 characters or fewer, including the , to accommodate PDS data ingestion requirements set forth by their internal catalogs and databases. --------------------------------------------------------------------- 5. Contact Information For questions concerning the Cassini ISS maps on this volume, contact: PDS Imaging Node Susan K. LaVoie M/S 168-514 Jet Propulsion Laboratory 4800 Oak Grove Drive Pasadena, CA 91109-8099 (818) 354-5677 WWW Site: http://pds-imaging.jpl.nasa.gov/ E-mail: feedback@pds-imaging.jpl.nasa.gov For questions related to the Cassini Imaging Experiment and related data analysis contact: Dr. Carolyn Porco Space Sciences Institute 4750 Walnut Street Suite 205 Boulder, CO 80301 WWW Site: http://www.ciclops.org E-mail: cpcomments@ciclops.org For general information related to the PDS, contact: Planetary Data System, PDS Operator M/S 202-101 Jet Propulsion Laboratory 4800 Oak Grove Drive Pasadena, CA 91109-8099 (818) 354-4321 WWW Site: http://pds.jpl.nasa.gov/ E-mail: pds_operator@jpl.nasa.gov --------------------------------------------------------------------- 6. Cognizant Persons & Acknowledgments This cartographic map archive volumes are being produced at the Cassini Imaging Central Laboratory for Operations (CICLOPS) located at Space Sciences Institute in Boulder, Colorado. The map data are being processed at the Institute of Planetary Research, German Aerospace Center (DLR), Berlin, Germany and the Remote Sensing of the Earth and Planets, Freie Universitat Berlin, Germany. Special thanks to R. Kirk (USGS) for the helpful discussions about the cartographic standards to use in the Cassini mapping activities and for reviewing the Voyager and Cassini maps. Also, special thanks to Chris Isbell (USGS) for his early-on useful discussions on 'how to' archive cartographic mapping products.