Data Set Information
DATA_SET_NAME VG1/VG2 JUPITER IMAGING SCIENCE SUBSYSTEM PROCESSED V1.0
DATA_SET_ID VG1/VG2-J-ISS-2/3/4/6-PROCESSED-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : This is a regeneration of the Voyager 1 and 2 images from Jupiter, in multiple versions including decompressed raw, cleaned, calibrated and geometrically corrected forms. It has been derived from the earlier PDS data set VG1/VG2-J-ISS-2-EDR-V1.0, which appeared on volumes VG_0006, VG_0007, VG_0008 and VG_0013 to VG_0025. The information covers Voyager 1 and 2 at Jupiter (1979), including the planet, its satellites and rings. Pointing information is not included in this data set. The data set is organized chronologically for each Voyager encounter. Volumes VGISS_5101-5120 contain the Voyager 1 images; volumes VGISS_5201-5214 contain the Voyager 2 images. For each Voyager image, the following files are included: RAW - The decompressed raw image. RESLOC - A table of reseau locations. GEOMA - A table of tiepoints describing the geometric correction of the image. CLEANED - The raw image with various spikes, blemishes and reseau markings removed. CALIB - The calibrated image, in which data numbers are directly proportional to reflectivity. GEOMED - The geometrically corrected version of the calibrated image. All images and binary tables are provided in VICAR format, as defined by JPL's Multimission Instrument Processing Laboratory (MIPL). A VICAR file begins with an ASCII header describing the structure of the file. ASCII text versions of the binary tables are also included. Processing Level Id : {2, 3, 4, 6} Software Flag : N Processing Start Time : 2011-05-01 Processing Stop Time : 2012-05-01 Overview of the Data Set from the Original DATASET.CAT ------------------------------------------------------ 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 initial collection includes all of the images acquired by Voyager 2 as it passed by the planet Uranus, and selected near-encounter images of Jupiter, Saturn, and their satellites taken by both spacecraft. The current Voyager archive resides on eight CDROM volumes. Each volume contains approximately 2500 images stored in individual files. The Uranus volumes, (volumes one through three), store the entire image collection acquired during Voyager 2's encounter with Uranus. The Saturn volumes, (volumes four and five), and the Jupiter volumes, (volumes six through eight), contain the best nearest-encounter images for the respective planets and their moons. In addition to the images, supplemental information exists on the CDROMs. This includes documentation providing a user with information 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 all the images stored in the archive. The set of images on the CDROMs are raw; no processing has been performed other than organizing the original telemetry into raster-formatted files and compressing the image data using a Huffman encoding algorithm. To make full scientific use of the image collection, it is necessary to understand the radiometric and geometric properties of the camera system and perform corrections to the data. Media/Format : The archival data set is written on CD-ROM media. The CD-ROM volumes conform to ISO 9660 standards. Processing Level Id : 2 Software Flag : N Processing Start Time : 1979-02-01 Processing Stop Time : 1980-04-01 Parameters : Data Set Parameter 'DATA NUMBER' -------------------------------- Data Number is an integer expressing the digital value of each pixel in an image. Sampling Parameter Name : PIXEL Data Set Parameter Name : DATA NUMBER Data Set Parameter Unit : DIMENSIONLESS Data Set Parameter 'PIXEL COORDINATE' -------------------------------- Pixel coordinate is a real value expressing the horizontal or vertical location in an image. Coordinates are numbered in units of image pixels, beginning at one. Sampling Parameter Name : PIXEL Data Set Parameter Name : PIXEL COORDINATE Data Set Parameter Unit : DIMENSIONLESS 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 : VG1/VG2-J-ISS-2-EDR-V1.0 Software : VGRCDCOPY Product Data Set ID : RAW IMAGE Source Data Set ID : RAW IMAGE Software : VGRFILLIN Product Data Set ID : VGRFILLIN IMAGE Source Data Set ID : VGRFILLIN IMAGE Software : RESLOC Product Data Set ID : {RESEAU TABLE, TIEPOINT TABLE} Source Data Set ID : {VGRFILLIN IMAGE, RESEAU TABLE, BLEMISH TABLE} Software Name : RESSAR77 Product Data Set ID : RESSAR77 IMAGE Source Data Set ID : RESSAR77 IMAGE Software Name : DESPIKE Product Data Set ID : CLEANED IMAGE Source Data Set ID : {CLEANED IMAGE, DARK CURRENT IMAGE, CALIBRATION MODEL} Software Name : FICOR77 Product Data Set ID : CALIBRATED IMAGE Source Data Set ID : {CALIBRATED IMAGE, TIEPOINT TABLE} Software Name : GEOMA Product Data Set ID : GEOMETRICALLY CORRECTED IMAGE Software 'VGRCDCOPY' -------------------- VICAR routine VGRCDCOPY decompresses a raw, EDR image as archived in PDS data set VG1/VG2-J-ISS-2-EDR-V1.0. It creates the RAW version of the image with a VICAR header. Source Data Set ID : COMPRESSED RAW IMAGE Software Name : VGRCDCOPY Product Data Set ID : RAW IMAGE Software Type : N/A Software Release Date : UNK Node ID : IMAGING Cognizant Engineer : SUSAN K. LAVOIE Software Access Description : MIPL Software 'VGRFILLIN' -------------------- VICAR routine VGRCDCOPY fills in incomplete lines with the average of the adjacent lines. Source Data Set ID : RAW IMAGE Software Name : VGRFILLIN Product Data Set ID : VGRFILLIN IMAGE Software Type : N/A Software Release Date : UNK Node ID : IMAGING Cognizant Engineer : SUSAN K. LAVOIE Software Access Description : MIPL Software 'RESLOC' ----------------- VICAR routine RESLOC locates the reseau markings within the Voyager image. Source Data Set ID : VGRFILLIN IMAGE Software Name : RESLOC Product Data Set ID : {RESEAU TABLE, TIEPOINT TABLE} Software Type : N/A Software Release Date : UNK Node ID : IMAGING Cognizant Engineer : SUSAN K. LAVOIE Software Access Description : MIPL Software 'RESSAR77' ------------------- VICAR routine RESSAR77 erases reseau markings and blemishes by replacing them with an average of the adjacent images. Source Data Set ID : {VGRFILLIN IMAGE, RESEAU TABLE, BLEMISH TABLE} Software Name : RESSAR77 Product Data Set ID : RESSAR77 IMAGE Software Type : N/A Software Release Date : UNK Node ID : IMAGING Cognizant Engineer : SUSAN K. LAVOIE Software Access Description : MIPL Software 'DESPIKE' ------------------- VICAR routine DESPIKE erases spikes in the images by replacing them with an average of the adjacent images. Source Data Set ID : RESSAR77 IMAGE Software Name : DESPIKE Product Data Set ID : CLEANED IMAGE Software Type : N/A Software Release Date : UNK Node ID : IMAGING Cognizant Engineer : SUSAN K. LAVOIE Software Access Description : MIPL Software 'FICOR77' ------------------ VICAR routine FICOR77 subtracts a dark current and rescales the image into calibrated values. Source Data Set ID : {CLEANED IMAGE, DARK CURRENT IMAGE, CALIBRATION MODEL} Software Name : FICOR77 Product Data Set ID : CALIBRATED IMAGE Software Type : N/A Software Release Date : UNK Node ID : IMAGING Cognizant Engineer : SUSAN K. LAVOIE Software Access Description : MIPL Software 'GEOMA' ------------------ VICAR routine GEOMA resamples a Voyager image to remove its intrinsic geometric distortion. Source Data Set ID : {CALIBRATED IMAGE, TIEPOINT TABLE} Software Name : GEOMA Product Data Set ID : GEOMETRICALLY CORRECTED IMAGE Software Type : N/A Software Release Date : UNK Node ID : IMAGING Cognizant Engineer : SUSAN K. LAVOIE Software Access Description : MIPL
DATA_SET_RELEASE_DATE 2013-10-25T00:00:00.000Z
START_TIME 1978-12-11T12:00:00.000Z
STOP_TIME 1979-04-14T12:00:00.000Z
MISSION_NAME VOYAGER
MISSION_START_DATE 1972-07-01T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME SKY
VEGA
J RINGS
CALLISTO
IO
DARK
AMALTHEA
EUROPA
SCORPIUS
GANYMEDE
ADRASTEA
THEBE
ARCTURUS
ORION
METIS
JUPITER
TARGET_TYPE CALIBRATION
STAR
RING
SATELLITE
PLANET
INSTRUMENT_HOST_ID VG2
VG1
INSTRUMENT_NAME IMAGING SCIENCE SUBSYSTEM - NARROW ANGLE
IMAGING SCIENCE SUBSYSTEM - WIDE ANGLE
INSTRUMENT_ID ISSN
ISSW
INSTRUMENT_TYPE CAMERA
VIDICON CAMERA
NODE_NAME Planetary Rings
ARCHIVE_STATUS LOCALLY ARCHIVED
CONFIDENCE_LEVEL_NOTE Overview : This data set represents a complete collection of images from Voyager 1 & 2 Saturn encounters beginning with the Observatory Phase. The image processing history represents our best understanding of the cameras circa the early 1990's. The programs used to process the images have not been updated in any significant way since the Voyager 2 Neptune encounter in 1989. Absolute calibration is probably accurate to the level of 5-10%; relative calibration of images through the same camera and filter is better. Absolute calibration of the Voyager 2 data set is probably somewhat more accurate due to results from the subsequent Uranus and Neptune encounters. NOTE: No calibration model is available for filters NAD (sodium) and CH4_JS on the Voyager 1 wide angle camera. For these images, the Voyager 2 models are substituted. However, the cameras have different gains so these images are not photometrically accurate in absolute terms. Zero values in the images are based on a dark current subtraction; these values are probably accurate to the level of a few data numbers. Comparison of reference dark current images taken close in time can be used to estimate the systematic variations.
CITATION_DESCRIPTION Showalter, M.R., Gordon, M.K., andD. Olson, VG1/VG2 JUPITER IMAGING SCIENCE SUBSYSTEM PROCESSED V1.0,VG1/VG2-J-ISS-2/3/4/6-PROCESSED-V1.0, 2013.
ABSTRACT_TEXT This data set contains all of the Voyager images from Jupiter incleaned, calibrated and geometrically corrected forms. It is derivedfrom data set VG1/VG2-J-ISS-2-EDR-V1.0.
PRODUCER_FULL_NAME MARK R. SHOWALTER
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