/* VG1/VG2 SATURN IMAGING SCIENCE SUBSYSTEM EDITED EDR V2.0 */ OBJECT = DATA_SET DATA_SET_ID = "VG1/VG2-S-ISS-2-EDR-V2.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "VG1/VG2 SATURN IMAGING SCIENCE SUBSYSTEM EDITED EDR V2.0" START_TIME = 1980-09-28 STOP_TIME = 1981-08-22 DATA_OBJECT_TYPE = "IMAGE" DATA_SET_RELEASE_DATE = 1988-05-01 PRODUCER_FULL_NAME = "SUSAN K. LAVOIE" PRODUCER_INSTITUTION_NAME = "JET PROPULSION LABORATORY" DETAILED_CATALOG_FLAG = "N" DATA_SET_COLLECTION_MEMBER_FLG = "N" DATA_SET_DESC = " Data Set Overview ================= This Voyager 1 & 2 Saturn data set is available on CD-ROM. NASA's Voyager Project and the Planetary Data System (PDS) have created an archive of planetary digital images acquired by the twin Voyager spacecraft (Voyager 1 and Voyager 2). This Voyager dataset encompasses a subset of the Experiment Data Record (EDR) files from the Saturn encounters. The information covers Voyager 1 and 2 at Saturn (1981), including the planet, its satellites and rings. Important to note is the fact that while geometry information and calibration exists for this data set, they do not exist in the EDR data set, but both are available separately through the Imaging Node. Neither does the data set include starfields, calibrations, Plasma Radio Astronomy (PRA) or Plasma Wave Spectrometer (PWS) image-formatted information. These too are available separately through the Imaging Node. The complete Voyager 1 & 2 Saturn data set resides on magnetic tape in EDR format (reference VG1/VG2-S-ISS-2-EDR-V1.0). (No processing has been performed other than organizing the original telemetry into raster-formatted files. The set of images on CD-ROM are also raw, however they have been compressed using a Huffman encoding algorithm.) Detail Target Clarification: There are two targets which may prove to be confusing for the unfamiliar user; PLAQUE and CAL LAMPS, both are used as calibration targets. PLAQUE is an image of a flat piece of metal illuminated by the sun. CAL LAMPS are lamps inside the camera used for illumination. The target DARK is a dark current image when the camera mode is BODARK and the exposure is zero. DARK SKY and SKY are shuttered images, non-zero exposures looking at dark sky. SCAT LIGHT images are used to measure how much light is scattered in a particular direction. In addition to the images, supplemental information exists on the CD-ROMs. This includes documentation about the organization and contents of the disk. Software source code is included to provide programmers with tools to process the image files. There are browse images, sub-sampled versions of the full-resolution images, which allow users to rapidly view the archive collection with their interactive display. Finally, there are image index files containing information about the images stored in the archive. Definition Clarification: Planetodetic latitude of a point on the planet surface is the angle between the surface normal and the equatorial plane. For a spherical body, the latitude is incidental to the planetocentric latitude. The p5 point is one of 6 static points on all images. It is the point located in the center of the image. The p1 point is located in the top left corner, p2 top right corner, p3 bottom left corner, p4 bottom right corner, p5 center, p6 center right edge. If the target is not on the p5 point then tat point does not have latitude and longitude coordinates associated with it nor does the target have a p5 point. The spacecraft coordinate system is a coordinate system defined by the spacecraft structure. The antenna points along the +z axis, the booms are along the +y and -y axes, creating a unique coordinate system for each spacecraft. The Canopus coordinate system is the coordinate system defined by one axis pointing at Canopus, one pointing at the Sun and one pointing somewhere else. These systems are not used for describing images or points on images. Because our interest is in where the pixels lie, not relative to the spacecraft or stars but relative to the target's own system. Processing Level Id : 2 Software Flag : N Processing Start Time : 1988-12-01 Processing Stop Time : 1989-03-31 Parameters ========== Sampling Parameter Name : PIXEL Data Set Parameter Name : DATA NUMBER Data Set Parameter Unit : DIMENSIONLESS Description ----------- Data Number is an integer expressing the digital value of an experiment's telemetry data. Source Instrument Parameters ============================ Instrument Host ID : VG1 Data Set Parameter Name : DATA NUMBER Instrument Parameter Name : RADIANCE Important Instrument Parameters : 1 Instrument Host ID : VG2 Data Set Parameter Name : DATA NUMBER Instrument Parameter Name : RADIANCE Important Instrument Parameters : 1 Processing ========== Processing History ------------------ Source Data Set ID : FRAMSINK Software : VIMBUILD Product Data Set ID : UNPROCESSED DATA RECORD Source Data Set ID : UNPROCESSED DATA RECORD Software : MERGE Product Data Set ID : RAW DATA RECORD Source Data Set ID : RAW DATA RECORD Software : EDRGEN Product Data Set ID : VG1/VG2-S-ISS-2-EDR-V2.0 Software 'VIMBUILD' ------------------- The functions of VIMBUILD include: 1) to receive, reconstruct, and format high rate telemetry data into 'images' 2) decompress data and fill edited data as required, and 3) extract and store selected spacecraft and sensor engineering data from telemetry. Source Data Set ID : FRAMSINK Software Name : VIMBUILD Product Data Set ID : UNPROCESSED DATA RECORD Software Type : N/A Software Release Date : 1985-10-01 Node ID : IMAGING Cognizant Engineer : SUSAN K. LAVOIE Software Access Description : NOT ACCESSIBLE THROUGH PDS CATALOG - CONTACT NODE. Software 'MERGE' ---------------- The MERGE program creates a new Voyager image from all version of a specified image. This program is part of the VICAR system (see VICAR). Source Data Set ID : UNPROCESSED DATA RECORD Software Name : MERGE Product Data Set ID : RAW DATA RECORD Software Type : N/A Software Release Date : 1989-09-01 Node ID : IMAGING Cognizant Engineer : SUSAN K. LAVOIE Software Access Description : NOT ACCESSIBLE THROUGH PDS CATALOG - CONTACT NODE. Software 'EDRGEN' ----------------- The EDRGEN program generates Voyager EDR formatted tapes. This program is a part of the VICAR system (see VICAR). Source Data Set ID : RAW DATA RECORD Software Name : EDRGEN Product Data Set ID : VG1/VG2-S-ISS-2-EDR-V2.0 Software Type : N/A Software Release Date : 1989-09-01 Node ID : IMAGING Cognizant Engineer : SUSAN K. LAVOIE Software Access Description : NOT ACCESSIBLE THROUGH PDS CATALOG - CONTACT NODE. " CONFIDENCE_LEVEL_NOTE = " Overview ======== This data set represents a collection of raw images from Voyager 1 & 2 Saturn encounters beginning with the Observatory Phase. To make full scientific use of the image collection, it is necessary to understand and obtain (from the Imaging Node) the radiometric and geometric properties of the camera system and perform corrections to the data. Geometry and basic pointing information is included for all Image Observation Types including Calibration, Stars and very small Satellites (or 'Rocks'). Non major planetary bodies, like rocks may have geometry that refers to the primary planetary bodies (SATURN, MIMAS, ENCELADUS, TETHYS, DIONE, RHEA, TITAN, HYPERION, IAPETUS, and PHOEBE). We recommend obtaining a copy of the 'Software Interface Specification, ISS PI SEDR Processor, Rev.b, SIS 4-7008-2', an internal JPL document available from the JPL vellum files, for reference while using this data set. This document will clarify some questions which may arise when using the geometry data, particularly for non primary planetary bodies. For example; the original predict Supplemental Experiment Data Records (SEDRs) had a target for each image. Some targets have been changed as information about that particular image has been refined. However the geometry still refers to the original target from the SEDR. We suggest contacting the Imaging Node for more information, clarification or assistance. The values for emissions and incidence angles contain errors and were received that way on the original set of SEDR tapes. We intend to update these values when the entire set of SEDR tapes are regenerated. While using more than one Voyager data set some confusion can occur due to duplications in the Flight Data System (FDS) counts (a.k.a. spacecraft clock times). This is due first to the fact that Voyager 1 and 2 flew concurrently, so there is inter-spacecraft duplication, and second because of spacecraft clock resets and rollovers that occurred, causing duplication within data sets. Users are cautioned therefore, that the FDS count is not a unique identifier for an image. A unique query must include the spacecraft ID, the FDS count, and the target. There are two targets which may cause some confusion; ROCK and SYSTEM. Most ROCKs have names but some were potential satellites that never came to fruition or which may be named sometime in the future. The target SYSTEM indicates a image of the Saturn System or a section of that which will be used in conjunction with other sections to create a mosaic. The target DARK is a dark current image when the camera mode is in bodark and the exposure is zero. " END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_TARGET TARGET_NAME = CALYPSO END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = DARK END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = DIONE END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = "DIONE B" END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = ENCELADUS END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = EPIMETHEUS END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = HELENE END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = HYPERION END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = IAPETUS END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = JANUS END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = MIMAS END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = PANDORA END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = PHOEBE END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = RHEA END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = ROCK END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = "S RINGS" END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = SATURN END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = SYSTEM END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = TELESTO END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = TETHYS END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = TITAN END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = VG1 INSTRUMENT_ID = ISSN END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = VG1 INSTRUMENT_ID = ISSW END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = VG2 INSTRUMENT_ID = ISSN END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = VG2 INSTRUMENT_ID = ISSW END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "BARROS1988" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "BENESH1978" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "DANIELSONETAL1981" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "JGRV88" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "JPL D-2468" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "JPL D-498" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "MARTINETAL1985" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "NAVE1980" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "SCIENCEV212N4491" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "SCIENCEV215N4532" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "SIS4-7008-2" END_OBJECT = DATA_SET_REFERENCE_INFORMATION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "SNYDER,L1979" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END