| DATA_SET_DESCRIPTION |
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_NOTE |
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.
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