Level 2 Help for PHOTTESTM

Filename of the photometric catalog file (IBIS2) of type "phocat".
The structure of the phocat file is desined in such a way that tiepoint files 
can be extended and containing all collumns of the old IBIS1 photometric 
catalog files. 
The program PHOTTEST used only one IMAGE_* group IMAGE_1 containing 
informations relates to the image. GENERAL_QLF containes informations relates 
to the object point (e.g. CLASS_IDentifier). 
There are 19 columns in this file. All are empty exept folowing columns:
	IMAGE_1 & IncidenceAngle
	IMAGE_1 & EmissionAngle	 
	IMAGE_1 & PhaseAngle
	IMAGE_1 & I/F 		= reflectance values as computed from the 
				  photometric function.
	IMAGE_1 & StandDev
	GENERAL_QLF & CLASS_ID  = Class identification

Photometric function :

	valid values :	LAMBERT, 
			MINNAERT, 
			IRVINE, 
			VEVERKA, 
			BURATTI1, 
			BURATTI2, 
			BURATTI3, 
			MOSHER, 
			LUMME_BOWEL_HG1, 
			HAPKE_81_LE2, 
			HAPKE_81_COOK, 
			HAPKE_86_HG1, 
			HAPKE_86_HG2, 
			HAPKE_86_LE2, 
			HAPKE_HG1_DOM, 
			REGNER_HAPKE_HG1, 
			ATMO_CORR_REGNER
NOTE: When returning to the highest level of the menu (i.e. the MDF-file) you 
will see that the second selection point has been changed according to your 
input of PHO_FUNC.
For more see pho_routines.com and PHOPDF.COM 

The class_id nummerates the photometric functions. For using different fotometric functions or parameter sets.

Incidence angle in degree.
This parameter specifies the incidence angles for up to 100 points. If any of 
INC_ANG, EMIS_ANG, and PHAS_ANG are specified, then all three must be 
specified, and all with the same number of values.

Emission angle in degree.
This parameter specifies the incidence angles for up to 100 points. If any of 
INC_ANG, EMIS_ANG, and PHAS_ANG are specified, then all three must be 
specified, and all with the same number of values.

Phase angle in degree.
This parameter specifies the incidence angles for up to 100 points. If any of 
INC_ANG, EMIS_ANG, and PHAS_ANG are specified, then all three must be 
specified, and all with the same number of values.

Starting point for grid in degrees.
This parameter is only used if INC_ANG, IMI_ANG, and PHAS_ANG are not 
specified. It is used, togeter with parameter DELTA, to compute a grid of 
angles. This parameter specifies the starting values for the grid of: (Incidence, Emission, Azimuth) in that order. The Phase angle is computed for 
each point from the three given angles. 
The grid range for these angles is: 
	Incidence & Emission angles  : 0 -  90 degrees. 
	Azimuth 		     : 0 - 180 degrees.

Increment for grid in degrees.
This parameter is only used if INC_ANG, EMIS_ANG, and PHAS_ANG are not 
specified. It is used, together with parameter START, to compute a grid of 
angles. This parameter specifies the increment values for the grid of: 
(Incidence, Emission, Azimuth) in that order.
The grid range for these angles is: 
	Incidence & Emission angles  : 0 -  90 degrees. 
	Azimuth 		     : 0 - 180 degrees.

Simulated standard deviation.
If this quantity is non_zero, then the program will simulate experimental error 
by adding an absolute "error" to each computed reflectance. These errors will 
be random with a gaussian probability distribution with standard deviation = 
SIGMA. Since reflectances cannot exceeded 1.0, this is also assumed to be a 
maximum on SIGMA. To check that the simulated errors are reasonable, the 
program prints out the computed mean error and standard deviation for the 
errors added. The "STD.DEV" should be about equal to SIGMA, and the "MN.ERR" 
should be close to 0 (much smaller than SIGMA).

Arbitrary seed for SIGMA.
This is an arbitrary number used to start the random number generator for 
SIGMA. It is only used if SIGMA is not zero. The default can be used unless the 
user wants to ensure that the random numbers are different from a previous 
run. The value of this parameter should be a large, odd, negative integer.

Screen output of the data generated.
If this keyword is set to 'PRINT', a table will be printed to the screen. 

Albedo -  valid for the Lambert and Minnaert photometric functions.

Exponent - the geometrical constant k of the Minnaert photometric function.

Parameter of the Veverka, Squyres-Veverka and Mosher photometric functions.

Parameter of the Veverka, Mosher, Squyres-Veverka and Buratti 
photometric functions.

Parameter of the Veverka, Mosher, Squyres-Veverka and Buratti 
photometric functions.

Parameter of the Veverka, Mosher, Squyres-Veverka and Buratti 
photometric functions.

Buratti's parameter for modification of the Veverka photometric function.

Modification of the coefficient k in the Minnaert part 
of Mosher's photometric function (goes along with MO_EXP2).

Modification of the coefficient k in the Minnaert part 
of Mosher's photometric function (goes along with MO_EXP1).

Specific volume density of the soil.

Single-scattering albedo of the soil particles. It characterizes the 
efficiency of an average particle to scatter and absorb light. 
One of the classical Hapke parameter.

Parameter of the first term of the Henyey-Greenstein soil particle 
phase function.

Parameter of the second term of the Henyey-Greenstein soil particle 
phase function.

Asymmetry parameter (weight of the two terms 
in the Henyey-Greenstein soil phase function).

Parameter of the first term of the Legendre-Polynomial soil particle 
phase function.

Parameter of the second term of the Legendre-Polynomial soil particle 
phase function.

One of the classical Hapke parameter.
Parameter which characterizes the soil structure in the terms of porosity, 
particle-size distribution, and rate of compaction with depth (angular width 
of opposition surge due to shadowing). 

One of the classical Hapke parameter. 
Opposition magnitude coefficient. The total amplitude of the opposition surge 
due to shadowing. It is the ratio of the light scattered from near the 
illuminated surface of the particle to the total amount of light scattered at 
zero phase : 
B_SHOE=S(0)/(W_SOIL*p(0))
with p(0) - soil phase function
S(0) - opposition surge amplitude term which characterizes the contribution of 
light scattered from near the front surface of individual particles at zero 
phase.
For a true, shadow-hiding opposition effect, 0<=B_SHOE<=1.
However, there are several other phenomena that may also cause a surge in 
brightness at small phase angles. These including the following:
1) The coherent backscatter or weak photon localisation due to multiply 
   scattered light.
2) An single-particle opposition effect caused by complex porous agglomerates 
   ( soil phase function )
3) Glory caused by sperical particles ( soil phase function )
4) Internal reflections of transparent particles ( soil phase function )
   These various phenomena may be large enough to increase the opposition surge 
   by more than a factor of 2. This possibility may be taken into account by 
   allowing B_SHOE to be greater than 1.
 

Parameter of the coherent backscattering ( angular width of the opposition 
surge due to multiply scattered light).
H_CBOE=lambda/(2*pi*L)
lambda - wavelength
L - the free path of the phonon in the medium

Opposition magnitude coefficient of the coherent backscattering 
(height of opposition surge due to multiply scattered light). 

Average topographic slope angle of surface roughness at subresolution scale.
One of the classical Hapke parameter. 

 Parameter of the Cook's modification of the old Hapke function.

Optical depth of the atmosphere.

Single scattering albedo of the atmospheric aerosols.

Parameter of the first term of the Henyey-Greenstein atmospheric phase function.

Parameter of the Irvine photometric function.

Parameter of the Irvine photometric function.

This is the name for the TAE-parameter file containing all parameters 
needed to running the program. The default name is PHOTTEST.PAR.
A user-specified name can be given to that file. This is similar to the
SAVE command in the Tutor Mode.