INP=(PIC,REF,OLDPTS) Input images and optional tiepoint file. These are the image to be navigated (PIC), the reference image (REF), and any tiepoints previously acquired for this frame pair (OLDPTS). The input images may be Voyager or Galileo SSI flight images in byte format. Both geometrically corrected (object-space) and uncorrected (image-space) frames may be input.
SPICEMODE=LOCAL specifies that SPICE data is to be retrieved from local SPICE kernels. SPICEMODE=REMOTE specifies that SPICE data is to be retrieved via the SPICE server. If SPICEMODE is defaulted, the logical name (or environmental variable) DEFAULTSPICE is used to determine whether LOCAL or REMOTE is used. Note that if SPICE data is not found in LOCAL or REMOTE mode, the other mode is attempted.
CKNAME is a four character string specifying the C-kernel to be used: CKNAME C KERNEL -------- ------------- DAVI MIPS_DAVI.CK NAV MIPS_NAV.CK FARE MIPS_FARENC.CK NAV2 MIPS_NAV2.CK NEAR MIPS_NEAR.CK AMOS MIPS_AMOS.CK NAIF the best NAIF kernel is used If defaulted, the kernels are searched in the above order.
CKID is an alternative way to specify the prefered C-kernel (see CKNAME
parameter):
CKID CKNAME C KERNEL
---- -------- -------------
M906 DAVI MIPS_DAVI.CK
M905 NAV MIPS_NAV.CK
M904 FARE MIPS_FARENC.CK
M903 NAV2 MIPS_NAV2.CK
M902 NEAR MIPS_NEAR.CK
M901 AMOS MIPS_AMOS.CK
varies NAIF there are a large number of these files
Ex: CKID=M901 specifies the four character ID which uniquely identifies the
C-kernel MIPS_AMOS.CK.
A complete list of the C-kernel IDs is located in the ASCII file assigned the
logical name (or environmental variable) KERNELDB.
If specified, CKID overrides the CKNAME parameter.
USERID is a three character string which identifies the user who created the
camera pointing.
Ex: USERID=HBM identifies Helen Mortensen as the creator of the camera
pointing.
GROUPID is a three character string which identifies the group which created the camera pointing. Ex: GROUPID=040 identifies group 040 as the creator of the camera pointing.
INSTITUTE is a four character string identifying the facility which created the camera pointing. Ex: INSTITUTE=MIPS specifies that MIPS created the camera pointing.
PURPOSE is a four character string identifying the purpose of the observation or the purpose of processing. For example, PURPOSE=MOSA identifies the image as part of a mosaic sequence PURPOSE=COLO identifies the image as part of a color sequence
PROGRAM is the first six characters of the program creating the camera pointing. Ex: PROGRAM=FARENC specifies that FARENC created the camera pointing.
SPKID specifies the four character ID which uniquely identifies the SP kernel used to create the camera pointing. The SP-kernel IDs are located in the ASCII file assigned the logical name (or environmental variable) KERNELDB. Ex: SPKID=N015 specifies the SP kernel GLL_LONG_2.BSP
REQUNUM is a four character string identifying the IPL request number for which the camera pointing was created. Ex: REQNUM=3456 identifies (somewhat) request number R123456
Date and time the camera pointing was created in the form 'YEARMMDDHHMM'.
Ex: CDATE=199602291200 specifies that the pointing was created at noon
on February 29, 1996.
INTEGER - Length of correlation window in pixels.
The correlation window is of dimension NLW x NSW.
Entering NAVVEL will cause NAV2 to adjust for atmospheric motion when fitting the tiepoints. The user is prompted to specify the zonal and meridional components of each tiepoint. For Jupiter, the user may elect to have the program automatically compute the zonal velocities from a zonal-velocity profile (the meridional component is assumed to be zero). This command is valid for atmospheric planets only.
INTEGER - Size of window used to compute average DN values for tiepoints. Entering ZWIND=10 will cause a 10x10 window to be used for computing the average DN value centered on each tiepoint. This value is stored in the output tiepoint file.
INTEGER - Center display and zoom
Example: CZOOM=2
Center the display around the selected cursor position and magnify
the image to twice normal resolution.
Display entire image. The image may be displayed at reduced resolution to accomplish this.
KEYWORD - Overlay (in graphics plane) histogram of displayed image area. A logrithmic frequency scale is used.
INTEGER - Ex: SPIKES=n will scale the frequencies so that the n'th largest frequency corresponds to maximum scale.
INTEGER - Stretch the displayed image
Example: STRETCH=(25,100)
A hardware stretch (linear transformation) is applied to the displayed
image.
The STR1 and STR2 commands may be used to stretch the left and right image areas independently. Entering STR1=(10,128) will cause the left image area to be stretched as it is being written to the display. Note that these commands are independent of the hardware stretch, so that following these commands with STRETCH=(5,220) will result in further stretching of the stretched images.
Use planetographic latitudes
All input and output latitudes are reported as planetographic.
Note that this is the default for Voyager.
Use planetocentric latitudes
All input and output latitudes are reported as planetocentric.
REAL - Planet center (line,sample)
Example: PC=(433.2,315.3)
The camera pointing is updated so that the planet center is
located at (line,sample)=(433.2,315.3) in the image.
REAL - Planet center of VGR wide-angle frame. The input frame is assumed to be the narrow-angle frame of a WA-NA simultaneous exposure. WAPC permits input of the planet center (line,sample) of the corresponding wide-angle frame. The planet center for the narrow-angle frame is then derived using the known transformation between the to camera fields-of-view. EX: WAPC=(235.3,335.8)
REAL - North angle
Example: ANGLN=45.3
The camera pointing is updated so that the planet's projected
spin axis is oriented at a 45.3 degree angle, measured
clockwise from up in the image.
REAL - Spacecraft range (km).
Distance from spacecraft to planet center.
STRING - Target body name Example: TARGET=SATURN
KEYWORD - Save current navigation or orbital data.
KEYWORD - Restore previously saved navigation or orbital data. If no previous values were saved, initial values are retrieved.
KEYWORD - Retrieve navigation data from SEDR. This restores the nominal camera pointing.
STRING--OPTIONAL
Specifies the Voyager Reseau Location File. If defaulted, the program
automatically accesses the file for the planet-of-encounter as follows:
/project/vgr/resj.fil (jupiter)
/project/vgr/ress.fil (saturn)
/project/vgr/resu.fil (uranus)
/project/vgr/resn.fil (neptune)
Magnify or compress displayed area by an integral factor. ZOOM=2 magnifies the area by a factor of two. ZOOM=-4 compresses the area by a factor of four.