Data Set Overview : This data set has been generated by NASA's Galileo Project in order to distribute the images acquired by the Solid State Imaging (SSI) camera to the scientists and later to the Planetary Data System (PDS). The collection resides on volumes GO_0007 thru GO_0015 and consists of all images acquired by the Galileo spacecraft during the Gaspra and the second encounter with the Earth (Earth2). Included are images of Gaspra, the Earth's Moon and the Earth taken during the 1991 and 1992 encounters (SCLK 99757945 through 166324700), as well as additional star and calibration data.   Parameters : The Galileo SSI camera acquires data in a digital raster-format containing 800 scan lines and 800 samples per scan line. Each picture element (pixel) in the two dimensional image array is represented as an 8-bit value between 0 and 255, proportional to the amount of light detected at that point (with 0 being the least amount of light and 255 being the greatest amount of light). The camera is equipped with seven color filters and a clear filter such that images taken through complementary filters can be combined during ground processing to produce color images. To make full scientific use of the image collection, the radiometric and geometric properties of the camera system should be understood.  The ancillary disc, GO_0001, will provide calibration files and technical documentation necessary for the understanding of the images produced by the SSI camera. Presently, calibration files and software are available through the VICAR software system at MIPS and SPICE files are available through the Galileo Science Data Team.   Processing : REDR Processing:  The Raw Experiment Data Records (REDRs) were produced by the Multimission Image Processing Subsystem (MIPS) at the Jet Propulsion Laboratory using several Video Image Communications and Retrieval (VICAR) programs. The processing included the following steps:  --The original telemetry data was processed into raster-formatted files (GLLTELEMPROC) --Multiple versions of each data file obtained from separate downlinks or playbacks were merged together to create the best version of the data (SSIMERGE) --The VICAR label was updated to reflect the most recent pointing information (CATLABEL) --Bad data value information was then added to the Telemetry Header (BADLABELS) --Missing line gaps of two lines or less were filled in, as specified by the SSI Team. (GLLFILLIN) --The PDS Index table and detached PDS label files were generated. (CDGEN) --The VICAR files and PDS files were premastered onto a WORM CD-ROM which was validated. --The WORM CD-ROM was sent to a vendor and CD-ROM's were generated. --A final CD-ROM was compared bit-by-bit with the original data to ensure the quality of the vendor product.   Data : Each volume contains approximately 800 images stored as VICAR files. A detached PDS label has been included for each image. Documentation files have been provided which inform the user about the organization and contents of the disc, and the definition of the labels. An index files have also been provided which contain information about the images in the data set.  The REDR data are generated by MIPS using procedures specifically developed or adapted for Galileo. The files are generated on a VAX and are written in VAX compatible (LSByte first) format.   REDR File Format : The Galileo REDR format (WHITE1993) was originally reserved for SSI calibration data or data which should not be radiometrically corrected. The SSI Team recently decided that the REDR format will be used to archive all raw SSI data.  Each REDR file consists of a VICAR label, the telemetry header, the bad-data value header records (if there are any), and the Image Data which is preceded by a Binary Prefix. There are 800 line records of image data. All records are fixed length. The line record length is 1000 bytes; 200 bytes of a binary line prefix and 800 bytes of 8 bit pixel data. (Note, for the AI8 format or summation mode, the record length is still 1000, but the data is placed in the first 400 pixel samples and 400 lines only.) There will be a one-to-one correspondence between line records and image lines. Data not received will be zero-filled.  The BINARY HEADER is composed of a Telemetry header and a Bad-Data Value Header containing ancillary information specific to the image. The TELEMETRY HEADER is split into two physical records. The first 1000 bytes are placed in the first physical record after the VICAR label, and the last 800 bytes are placed in the next physical record. The last 200 bytes are zero filled. The BAD-DATA VALUE HEADER is composed of records describing several types of bad data values. Each record describes only one type and depending on the number of bad pixels, they may span over several physical records. Each record is identified by the Record IDS field which is located at byte 0.    Ancillary Data : All document files and detached label files contain a carriage return character (ASCII 13) and a line feed character (ASCII 10) at the end of each record. This allows the files to be read by the MacOS, DOS, Unix, and VMS operating systems. Tabular files are also described by a detached PDS label. The PDS label file has the same name as the data file it describes, with the extension .LBL; for example, the file IMGINDEX.TAB is accompanied by the detached label file IMGINDEX.LBL in the same directory. The detached PDS labels for REDR images contain information pertaining to the image.  Tabular files are formatted so that they may be read directly into many database management systems on various computers. All fields are separated by commas, and character fields are enclosed in double quotation marks. Character fields are left justified, and numeric fields are right justified. The start byte and bytes values listed in the labels do not include the commas between fields or the quotation marks surrounding character fields. The records are of fixed length, and the last two bytes of each record contain the ASCII carriage return and line feed characters. This allows a table to be treated as a fixed length record file on computers that support this file type and as a normal text file on other computers.  Software : The following CD-ROM copy, display and processing software has been successfully tested using the Galileo SSI data:   Copy Software ------------- --DCL COPY (VMS) - available with VMS --VICAR Copy (VMS and UNIX) - Available with VICAR package from COSMIC.   Display Software ---------------- --VICAR JDISP (VMS and UNIX) - Available with VICAR package from COSMIC. --PIXEL PUSHER (Apple Macintosh) - Available from COSMIC. --NIH IMAGE (Apple Macintosh) - A public domain program available from the National Institute of Health. --CDBROWSE (UNIX/Motif) - Software may be obtained from richard@ben.jpl.nasa.gov on the internet. --IMDISP (IBM PC) - Program and information about this program are available from PDS.   Processing Software ------------------- --VICAR (VMS and UNIX) - Available from COSMIC --ISIS (VMS and UNIX) - Available through the USGS in Flagstaff   Media/Format : Each CD-ROM disc has been formatted such that a variety of computer systems may access the data. Specifically, the discs are formatted according to the ISO 9660 level 1 Interchange Standard, and file attributes are specified by Extended Attribute Records (XARs). Formats are based on standards for archive EDR CD-ROM products established by PDS.

Confidence Level Overview : The SSI REDRs contain raw data as received from Galileo telemetry. All of the images received were processed and are contained on these volumes Included in the limitations section are explanations of the VICAR and PDS keywords and values, as well as a description of a problem found with one frame in the data set. This data set contains all of the data acquired during the Gaspra and Earth 2 period, the processing has been verified, and is currently in use by science team members in their analysis   Review : The SSI REDRs are reviewed prior to archiving by the SSI team. Data received is compared with data expected, and replays of missing data is requested. The status and validity information on the REDRs themselves is examined. Format and documentation of the CD-ROM archive volume is reviewed by PDS and is documented in WAINIO1992. The mastered and replicated CD-ROM volumes received from the vendor are compared bit-by-bit with the original data to ensure the quality of the product.   Data Coverage and Quality : Sequences and Objectives For Gaspra   OPNAV ----- Optical Navigation frames taken during approach to fine-tune spacecraft approach vectors.   GAPSLTCRV --------- This observation is part of the final rotation Gaspra movie and lightcurve. Each segment of the total lightcurve covers 30 degrees of rotation of Gaspra. Every third segment is through four filters to give data on the color of Gaspra. The remaining segments are through a single filter.   GAPS6FILTR ---------- This observation is the only six filter coverage of Gaspra. It is a 2x2 mosaic, 58 minutes from closest approach. The mosaic is required to cover the error ellipse.   GAPSTWKINS ---------- This observation is designed to cover the untweaked error ellipse. It is a 4x4 mosaic taken through one filter at 44 minutes before the closest approach.   GAPS4FILT --------- This observation is the highest resolution, four color observation of Gaspra. It requires 3x3 mosaic through 4 filters. It takes place 35 to 29 minutes before the closest approach to Gaspra.   GAPSHIPHAS ---------- This observation provides high phase and the highest resolution images of Gaspra. A 51 image mosaic is required to cover the error ellipse and it was taken 17 to 7 minutes before the closest approach to Gaspra.   Sequences and Objectives For Earth/Moon 2 ----------------------------------------- In this series of observations the instrument is taking calibration images of the Photometric Calibration Target (PCT) located on the spacecraft.  E2NSPCTCAL01 - calibration flat fields E2NSPCTCAL02 - calibration flat fields & signal vs. noise E2NSPCTCAL03 - calibration flat fields in the summation mode E2NSPCTCAL04 - calibration backup PCT observation E2HPTSTARS02 - boresight alignment calibration and dark frames E2HNNSTAR_01 - cooperative images for NIMS of star calibrations and dark frames E2HUUSTAR_01 - cooperative image for UVS star calibrations E2NSDARKHI02 - calibration dark frames taken in the high mode E2NSDRKSUM01 - calibration dark frames taken in the summation mode  In this series of observations the instrument is taking calibration images of a variety of different stars for instrument calibration purposes.  E2HSSTRCAL01 : photometric, point spread & shutter offset of Tau Cet E2HSSTRCAL02 : starcal & photometric of Tau Cet E2HSSTRCAL03 : photometric&point spread Zet Peg E2HSSTRCAL04 : photometric Alp Hya E2HSSTRCAL05 : photometric & point spread Alp Hya E2HSSTRCAL06 : photometric & point spread Del Psc E2HSSTRCAL07 : photometric & linearity Del Psc E2HSSTRCAL08 : photometric & point spread Alp Car E2HSSTRCAL09 : point spread, & cte calibration using the Pleiades E2HSSTRCAL10 : summation mode cte and point spread calibration of the Pleiades E2HSSTRCAL11 : summation mode gain ratio calibration using Bet Ari E2HSSTRCAL12 : photometric & point spread calibration using Bet Ari E2HSSTRCAL13 : back-up starcal of Bet Ari E2HSSTRCAL14 : back-up starcal of the Pleiades  E2HSOPNAV_01 : starcal, opnav and geometric calibration of the Pleiades E2JSOPNAV_01 : optical navigation 2x2 mosaic of the Jovian satellites E2JSSTRCAL_01 : scattered light observation of Jupiter E2NSBMSCAT01 : observe light scattering by the booms on spun portion of spacecraft E2HUUSTAR_02 : cooperative image for UVS star calibration E2LN4GAIN_01 : cooperative images for NIMS for gain calibration  These observations are color mosaics of the Earth's Moon, taken over the northern polar region in a variety of phase and view angles.  E2LSLUNMOS01 : photometric mapping coverage _ 120 degree phase angle, 7 filters E2LSLUNMOS02 : photometric mapping coverage _ 113 degree phase angle, 7 filters E2LSLUNMOS03 : photometric mapping coverage _ 95 degree phase angle, 7 filters E2LSLUNMOS04 : photometric mapping coverage _ 75 degree phase angle, 6 filters E2LSLUNMOS05 : photometric mapping coverage _ 55 degree phase angle, 6 filters E2LSLUNMOS06 : photometric mapping coverage _ 42 degree phase angle, 7 filters E2LSLUNMOS07 : photometric mapping coverage _ 18 degree phase angle, 6 filters E2LSLUNMOS08 : 7 filters, for calibration with LUNMAP11 from the Earth I encounter E2LSLUNMOS09 : 7 filters, for calibration with MAPCAL01 from the Earth I encounter   E2LULNRLMB01 : cooperative images for UVS lunar limbs and terminator E2LNHIRES_01 : cooperative images for NIMS high resolution E2LPFOVMAP01 : cooperative imaging for PPR field of view map E2HSRADMOD01 : Van Allen belts radiation event noise modeling E2WSANDES_01 : Andes multispectral mosaic E2WSHAWAUR01 : darkside Hawaii/Aurora E2WNANTAR_01 : cooperative imaging for NIMS Antarctica E2WSLTNING_01 : lightening search over southeast Asia and Indonesia before dawn E2WNAUSIE_01 : cooperative imaging for NIMS Australia E2WNINDO_01 : SSI/NIMS Indonesia/east Asia mosaic E2WNGMOS_01 : cooperative imaging for NIMS global mosaic E2WPBUDLIT01 : cooperative imaging for PPR earth radiation budget  This series of images of the Earth were taken in 7 filters at different distances from the Earth in order to generate the Earth zoom movie.  E2WSZOOMMV01 : mosaic/zoom movie pt 1 (from +15 hrs 06 min. to +20 hrs 03 min.)  E2WSZOOMMV02 : mosaic/ zoom movie pt 2 (from +23 hrs 07 min. to +1 day 03 hrs 00 min.)  E2WSZOOMMV03 : mosaic/ zoom movie pt 3 (from +1 day 05 hr 19 min. to +1 day 19 hrs 55 min.)  E2WSZOOMMV04 : mosaic/ zoom movie pt 4 (from +2 day 02 hr 13 min. to +2 day 09 hrs 20 min.)  E2WSZOOMMV05 : mosaic/ zoom movie pt 5 (from +2 day 10 hr 17 min. to +2 day 15 hrs 03 min.)  E2WSGOPEX_01 : GLL Optical experiment 1 with multispectral Earth mosaic  E2WSGOPEX_02 : GLL Optical experiment 2 with multispectral Earth mosaic  E2WSGOPEX_03 : GLL Optical experiment 3 E2WSGOPEX_04 : GLL Optical experiment 4 E2WSGOPEX_05 : GLL Optical experiment 5 E2WSGOPEX_06 : GLL Optical experiment 6 E2WSGOPEX_07 : GLL Optical experiment 7  E2LSLUNCAL01 : Lunar calibration MTF(Modulation Transfer Function)  E2LSLUNCAL02 : MTF and scattered light calibration  E2HUSYSCAN_01 : cooperative imaging for UVS to measure earth's geocorona and search for any UV emissions in vicinity of the Moon  E2WSEMCONJ01 : Periodic 3-filter image of Earth and Moon during conjunction period to produce color time-lapse movie sequence.   Limitations : This memo documents the currently known information about the Gaspra and Earth II data sets. For the purpose of this memo CD's refers to the nine Earth II SSI REDR CD-ROM's GO_0007 through GO_0015. Information will be provided covering: general information, new targets, bad images and known artifacts, Reed-Solomon Overflows, VICAR Labels, PDS Labels and PDS Index Table. Additional information regarding the Venus/Earth I REDR data set has also been provided.   General Information : This data set was processed the same way for each file and not based on the processing codes of the activity identification like the Venus/Earth I data set (GO_0002 - GO_0006). These data were produced on the Multimission Image Processing Subsystem (MIPS) using several Video Image Communications and Retrieval (VICAR) programs. The processing included the following steps. Multiple versions of each data file were merged together to create the best version of the data (SSIMERGE). The VICAR label was updated to reflect the most recent pointing information (CATLABEL). Bad data value information was then added to the Telemetry Header (BADLABELS). Then the PDS Index table and detached PDS label files were generated (CDGEN). The VICAR files and PDS files were premastered onto a WORM CD-ROM which was validated. The WORM CD-ROM was sent to a vendor and CD-ROM's were generated. A vendored CD-ROM was compared bit-by-bit with the original data to ensure the quality of the vendor product.  The data on the CD's can be broken into smaller encounters or special events. These smaller subsets of data have been identified and their starting and ending SCLK's provided along with special information needed to better understand the sets.   Gaspra Approach OPNAV --------------------- 99757945 106128945 - - No SPICE C info available - VICAR/PDS labels incomplete due to lack of SPICE info. - Activity id not in standard format   GASPRA ------ 107271600 107318513 - SPICE info available   PRE-EARTH CALIB --------------- 163288400 164953745 - No SPICE SP available - 7 images without any SPICE C info available.   EARTH II/MOON ------------- 164997300 166318700 - SPICE available except no SP available for the BLACK_SKY frames   EARTH/MOON CONJUNCTION ---------------------- 166236100 166318700 - SPICE available except no SP available for the BLACK_SKY frames   POST-EARTH CALIB ---------------- 166323200 166324700 - No SPICE SP available  The above encounters and events can be also be broken down into observation sequences. These sequences can be found by looking at the Activity Id within the label or in the PDS Index Table. A short description of the observation objectives has been provided in Appendix A for the Gaspra encounter and in Appendix B for the Earth II encounter.   New Targets : There are two new targets defined in this data set that were not previously seen on the Earth I data set. These are GOPEX and the Earth/Moon Conjunction.   GOPEX ----- On GO_0012, GO_0014 and GO_0015 there is a subdirectory (or folder) called GOPEX. This subdirectory contains the series of observation that were acquired as part of the Galileo OPtical EXperiment (GOPEX). In this experiment laser pulses were sent from two ground sites located in the western U.S. and were successfully detected in the frames taken by the SSI subsystem. The GOPEX frames are mainly black sky with a saturated earth limb present on the one edge of the frame. The laser pulses can be seen as a series of small, bright dots which occur in two vertical lines in the dark portion of the image. Additional information about this experiment can found by reading:  Wilson, K. E. , Lesh, J. R. & Yan, T. Y., (1993). GOPEX: A Laser Uplink to the Galileo Spacecraft on Its Way to Jupiter. In Proceedings of the SPIE- T he International Society for Optical Engineering Free-Space Laser Communications Technologies V, 1866, 138.  Wilson, K. E. & Lesh, J. R.,(1993).,Results from the Galileo Uplink: A JPL demonstration of Deep-space Optical Communications, In Proceedings of the 16th Annual Meeting and the 20th Day of Scientific Lectures of the National Society of Black Physicists, 63-74.  It should be noted that not all of the data acquired as part of the GOPEX data set and present in the GOPEX directory were actually part of GOPEX. Approximately one out of every six frame was the limb frame used for the GOPEX experiment. The other five frames contain images of the Earth in which no GOPEX data is present. (See Appendix B for more information on which activity id's were involved in this type of observation.)   Earth/Moon Conjunction (EMCONJ) ------------------------------- On GO_0015 there is a subdirectory (or folder) labeled EMCONJ. This subdirectory contains the series of multispectral observations in which the Moon passes in front of the Earth. These images were used to produce a color time-lapse movie.   Saturated Images ---------------- Within this data set there are a series of images which are saturated (i.e. data numbers are very high and image looks white). Appendix D contains the listing of all known saturated files. These files are generally part of the instrument calibration sequences such as the PCT calibration. The intent of these images is to help map out the cone/clock of bright sources on the spacecraft. This data is also of interest for scattered light calibrations.   Reed-Solomon Overflow --------------------- The Earth II Movie sequence files, Activity id's E2WSZOOMMV02 and E2WSZOOMMV03 or SCLK's 165233900 - 165165394700, contain more Reed-Solomon overflows than normally seen. This is due to interference in the radio link from the spacecraft low-gain antenna to Earth caused by the spinning spacecraft booms. After this period the downlink was sent from a different low gain antenna aboard the spacecraft and image quality returned to normal.  A Reed-Solomon overflow may occur in compressed images which were Reed-Solomon encoded by the Galileo spacecraft. If the Reed-Solomon decoder was unable to completely decode the data, this overflow feature is present in the data. Reed-Solomon overflows were not removed from this data set. Most of the overflows have been identified in the Binary Line Prefix of the VICAR label. Due to a known anomaly, a small percentage of the Reed-Solomon errors failed to be flagged in the Binary Prefix.  A Reed-Solomon overflow feature may be identified by the following criteria. It is present on a single line or series of lines. It starts about midway through a line and always continues through sample 800. The data numbers (dn's) can shift between white, black or shades of gray. In some cases, the dn's may be just a few dn brighter or darker than the surrounding lines. Reed-Solomon overflows should not be confused with the data gaps caused by the decompression of data. Decompression gaps are usually at the extreme right of an image, they always have a dn:0 (black) and they are clearly identified in the VICAR Binary Prefix.  Additional Limitations Discovered in the Gaspra/Earth 2 data set:  a) On GO_0008, in the VOLDESC.SFD, the LAST_SCET is incorrect and should be 9223391609.  b) On GO_0014 in the VOLDESC.SFD, the VOLUME_ID is incorrect and should be GO_0014.  c) It was recently discovered that all REDR XCM images obtained throughout the entire cruise period are shifted up by 1 line. There is a new VICAR program, XCMFIX, which will correct this problem.  d) When validating the CD's, the VICAR label of one of the images was found to be wrong. This frame (165242700 ) was reprocessed and placed in the REDO directory located on GO_0015.  e) Appendix C contains a list of the observations that were planned but not received on Earth due to downlink problems.   VICAR Labels : Definitions for VICAR field names can be found in WHITE1993  A) The RAD field (ring radius at frame center) within the VICAR label was not applicable and is equal to 0.0, for the entire set of CD's.  B) The following fields in the VICAR label were not implemented for the entire set of CD's.  HRA -999.0 SMEAR -999.0 SMRAZ 0.0 SOLRANGE Calib. frames only 7.779091  C) If no SPICE C information is available the following pointing fields in the VICAR label are not available. See the CATSTAT.TXT file located in the DOCUMENTS directory on all the CDs for more detailed information. There were 11 frames in this data set with no C kernel information. Those 11 frames were identified and NAIF was informed. Those frames are 99757945, 102786545, 105025645, 106128945, 163288400, 163288445, 163288600, 163288645, 163288700, 163288745, 163288800.  RA : 0.0 DEC : 0.0 TWIST : 0.0  D) For targets other than a planetary body or asteroid (e.g. black sky, stars, calibration etc.) most pointing information is not available. A listing of the missing fields is provided below. More detailed information can be found in the CATSTAT.TXT file which located in the DOCUMENTS directory on all of the CD's. These fields are also missing if no corresponding SPICE SP information is available for an image.  EMA -999.0 PHA 0.0 INA -999.0 LAT 0.0 LON 0.0 TCA closest time' HSCL -999.0 VSCL 0.0 PLRANGE 0.0 SLRANGE 0.0 SUNAZ 0.0 NORAZ 0.0 SCAZ 0.0 SOLRANGE 7.779091  E) PLRANGE is now always equivalent to the spacecraft central body range.   PDS Labels : Definitions for PDS field name can be found in CRIBBS1992  A) The following PDS fields were not applicable for the entire set of CD's .  BLEMISH_FILE_NAME : 'N/A' CENTER_RING_RADIUS : 0.0 DARK_CURRENT_FILE_NAME :' N/A' EDR_FILE_NUMBER :' N/A' EDR_TAPE_ID : 'N/A' MEAN_RADIANCE : 'N/A' MEAN_REFLECTANCE : 'N/A' ORBIT_NUMBER : 'unk' or 12869 or 16711 RADIANCE_SCALING_FACTOR : 'N/A' REFLECTANCE_SCALING_FACTOR : 'N/A' SHUTTER_OFFSET_FILE_NAME : 'N/A' SLOPE_FILE_NAME : 'N/A' UNEVEN_BIT_WEIGHT_CORR_Flag : 'N/A'  B) SPICE_FILE_NAME was changed to SOURCE_PRODUCT_ID. If the kernel was not available, it was identified as N/A. Several images were found to have NA in the I kernel identification location.  C) The following PDS fields were not implemented for the entire set of CD's.   LOCAL_HOUR_ANGLE : 'unk' SMEAR_AZIMUTH : 0.000 SMEAR_MAGNITUDE : 'unk' SOLAR_DISTANCE Calibration Only : 7.779091  D) If the SPICE C information is unavailable the following pointing fields in the PDS label are not available.  DECLINATION : 0.000 RIGHT_ASCENSION : 0.000 TWIST_ANGLE : 0.000  E) For targets other than a planetary body or asteroid (e.g. black sky, stars, calibration etc.) or if the SPICE SP information is missing, the following pointing information is not available in the PDS labels .  A_AXIS_RADIUS : 'unk' B_AXIS_RADIUS : 'unk' C_AXIS_RADIUS : 'unk' CENTER_LATITUDE : 0.00000 CENTER_LONGITUDE : 0.00000 CENTRAL_BODY_DISTANCE : 0.00000 EMISSION_ANGLE : 'unk' HORIZONTAL_PIXEL_SCALE : 0.00000 INCIDENCE_ANGLE : 'unk' NORTH_AZIMUTH : 0.000 PHASE_ANGLE : 'unk' SATELLITE_TIME_FROM_CLST_APR : 'unk' SLANT_DISTANCE : 0.00000 SUB_SOLAR_AZIMUTH : 0.000 SUB_SOLAR_LATITUDE : 'unk' SUB_SOLAR_LONGITUDE : 'unk' SUB_SPACECRAFT_AZIMUTH : 0.000 SUB_SPACECRAFT_LATITUDE : 'unk' SUB_SPACECRAFT_LINE : 'unk' SUB_SPACECRAFT_LINE_SAMPLE : 'unk' SUB_SPACECRAFT_LONGITUDE : 'unk' TARGET_CENTER_DISTANCE : 'unk' TIME_FROM_CLOSEST_APPROACH : 'unk' VERTICAL_PIXEL_SCALE : 0.00000  F) ORBIT_NUMBER for frames between 99757945 through 165033613 incorrectly reads 16711 or 12869 instead of UNK.  G) A few new keywords were added. They are POSITIVE_LONGITUDE_ DIRECTION, ^LINE_PREFIX_TABLE, INTERCHANGE_FORMAT in the Vicar Image Header Object, and TYPE in the Bad Data Value Header Object   PDS Index Table : A) The following fields in the PDS Index table were not applicable for the entire set of CD's, .  CENTER_RING_RADIUS : 0.0 MEAN_RADIANCE : 'N/A' MEAN_REFLECTANCE : 'N/A' ORBIT_NUMBER : 'unk' or 128 or 167 RADIANCE_SCALING_FACTOR : 'N/A' REFLECTANCE _SCALING_FACTOR : 'N/A'  B) The following fields in the PDS Index table were not implemented for the entire set of CD's.  LOCAL_HOUR_ANGLE :'unk' SMEAR_AZIMUTH : 0.000 SMEAR_MAGNITUDE : 'unk' SOLAR_DISTANCE Calibration only : 7.779091  C) When SPICE C information is unavailable the following pointing fields in the Index table are not available.  DECLINATION : 0.000 RIGHT_ASCENSION : 0.000 TWIST_ANGLE : 0.000  D) For targets other than a planetary body or asteroid (e.g. black sky, stars, calibration etc.) or the corresponding SPICE SP information is missing, some pointing information is not available. A listing of the missing fields is provided below.  CENTER_LATITUDE : 0.00000 CENTER_LONGITUDE : 0.00000 CENTRAL_BODY_DISTANCE : 0.00000 EMISSION_ANGLE : 'unk' HORIZONTAL_PIXEL_SCALE : 0.00000 INCIDENCE_ANGLE : 'unk' NORTH_AZIMUTH : 0.000 PHASE_ANGLE : 'unk' SATELLITE_TIME_FROM_CLST_APR : ' unk' SLANT_DISTANCE : 0.00000 SUB_SOLAR_AZIMUTH : 0.000 SUB_SOLAR_LATITUDE : 'unk' SUB_SOLAR_LONGITUDE : 'unk' SUB_SPACECRAFT_LATITUDE : 'unk' SUB_SPACECRAFT_LINE : 'unk' SUB_SPACECRAFT_LINE_SAMPLE : 'unk' SUB_SPACECRAFT_LONGITUDE : 'unk' TARGET_CENTER_DISTANCE : 'unk' TIME_FROM_CLOSEST_APPROACH : 'unk' VERTICAL_PIXEL_SCALE : 0.00000  E) When TARGET_CENTER_DISTANCE or CENTER _BODY_DISTANCE are equal to UNK, the right double quote is no longer missing in the index table.  F) In the TARGET field of the index file, there is a limitation to 10 characters which caused NON_SCIENCE to appear as NON_SCIENCE. The PDS labels contain the full target name.  G) When numerical fields in the Index Table have an unknown value, UNK has been entered into the table. This may cause problems with some databases which do not expect the in a numerical field.