INIT_LITHOS.TXT

Description

This text file sets limits, definitions, and logicals for SPC.

Here is a sample to show the keywords used in INIT_LITHOS.TXT.

INIT_LITHOS_Keywords1.jpg

INIT_LITHOS_Keywords2.jpg

Operational settings for INIT_LITHOS.TXT. There are other options, but they are not needed or supported for the OSIRIS-REx mission

USR= '0'
USRMX=12
BODY='RQ36'
IDCODE=2101955
#BFRAME='RQ36_FIXED'
BFRAME='IAU_BENNU'
PCK='DATA/naif0011.tls'
PCK='DATA/bennu_v10.tpc'
UNIT='METER'
ASIG= 0.05
SSIG= 0.15
CHI0= 1.0
BLIM= 0.5
MXSLP=0.6
BLOOM=0.2
SEED= 1.3827453
#REFLECT= 'VESTA'
NEWLIM=.TRUE.       find new limbs in LITHOSP
SOFTEN=1
MAPONLY=.FALSE.
#GEOPIC='pict1.txt'
RENAME=.FALSE.
REGFLG=.FALSE.
REG='J0'
KB=1
RPLUSE=.TRUE.
RECVR=.FALSE.
#RECVR=.TRUE.
ALPAD=.TRUE.
NEWLIM=.TRUE.
DISTORT= 'M###########' 'OWEN'  6
0.00000D+00        0.00000D+00    0.0000000-06    0.00000D+00    0.00000D+00    0.000000D-05   0.0000000D-07
DISTORT= 'P###########' 'OWEN'  6
0.00000D+00        0.00000D+00    0.000000D-06    0.00000D+00    0.00000D+00    0.000000D-07   0.0000000D-06
#SHAPERF= 'SHAPEFILES/SHAPE00.TXT'
#SIGMARF= .05
LMKWTS= 1, 1, 1, 0      WB, WO, WL, WR
PICWTS= 1, 1, 0, 1, 0      WB, WL, WC, WS, WT
#POLE:
#LMKWTS= 1, 0, 0, 0      WB, WO, WL, WR
LPCORLM= 0.2
ALCORLM= 0.3
GDCORLM= 0.3
HTCORLM= 0.2
CORRFLG= 3         0:LAP, 1:ALB, 2:GRD, 3:L+A
RESLM= 4           PIXEL<RESLM*SCALE [SCALE>PIXEL/RESLM]
PICLM=2
NUMLM=200
SIZLM= 1.5        ^ LOWERS PIXEL/SCALE
END

The following table shows additional parameters that may be used in INIT_LITHOS.TXT:

USRMX

When running any batch script program (make_scriptP, make_scriptAP), this value defines the number of processors that will be used

BODY

The is the name of the object

IDCODE

The is the number that NAIF uses to denote which object is being used. Bennu's official asteroid designator is 2101955

BFRAME

Contains the variable used to define the body fixed coordinate frame. This is defined by NAIF and used in the kernels

PCK

These define the planetary constants for a variety of objects. naif0011.tls is for the whole solar system. bennu_v10.tpc is the current version for Bennu. Many programs will read these line to do SPICE function calls.

UNIT

Sets the units that the tables report out units. Options are KILOMETER and METER

ASIG

The weighting that is placed upon the albedo solution. Default is 0.05

SSIG

The weighting that is placed upon the asteroid's topographic solution.

CHI0

Default is 1.0.

BLIM

Default is 0.5.

MXSLP

Default is 0.6.

BLOOM

Default is 0.02.

SEED

The seed value used for the random function call.

REFLECT

What photometric model to use. If not defined, SPC uses McEwin .

BLEMISHES='FC2#########'

Reference to a template contained in BLEMISHES/ for masking bad pixels which are common to all FC2 images (example taken from DAWN). The template name is 12 characters, with the characters common to all affected images in the correct positions and '#' everywhere else. There may be multiple BLEMISH entries, each referring to BLEMISH template files.

PRNLM=100

Prune limit used by residuals to alert you if the number of pictures containing a landmark exceeds the limit. Landmarks exceeding the limit are listed in the output file PRUNE.TXT.

Weighting values for landmark and picture calculations.

Within INIT_LITHOS.TXT, we have weighting that goes into the solution. The actual weight that is included is the sqrt of the value provided. Thus, if you want to double the weight, you would use 4.

LMKWTS -- Landmark Weights

These weights are used to influence the position of the central vector -- the middle of the landmark.

PICWTS -- Picture Weights

These weights are what is used when solving for the spacecraft position and camera pointing.


(Compiled by KD)

CategoryFiles CategoryInputFiles