VLIDORT User's Guide

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6.3.3.1. Input and output type structuresTable A: Type Structure VBRDF_Sup_InputsName Kind/Intent DescriptionDO_USER_STREAMS Logical (I) If set, there will be output at a number of off-quadraturezenith angles specified by user. This is the normal case.DO_BRDF_SURFACE Logical (I) If set, calculations for more complex surface BRDFkernels will be done.DO_SURFACE_EMISSION Logical (I) If set, calculations of surface thermal emission will bedone.DO_SOLAR_SOURCES Logical (I) Flag for solar beam source of light.DO_USER_OBSGEOMS Logical (I) If set, supplement will compute BRDF quantities atobservational geometry triplets specified by the user formultiple geometries. Used in conjunction with inputvariables N_USER_OBSGEOMS andUSER_OBSGEOMS.NSTOKES Integer (I) Number of Stokes vector parameters for whichcalculations will be done.NSTREAMS Integer (I) Number of quadrature values used in the azimuthintegration of the BRDF kernels in order to get Fouriercomponents of BRDF kernels. Recommended value 25 formost kernels, 50 for Cox-Munk.NBEAMS Integer (I) Number solar beams. Must ≤ symbolic dimensionMAXBEAMS.BEAM_SZAS Real*8 (I) Solar zenith angles (degrees). Checked internally range[0,90).N_USER_RELAZMS Integer (I) Number of user-defined relative azimuth angles. Must notbe greater than symbolic dimensionMAX_USER_RELAZMS.USER_RELAZMS Real*8 (I) Array of user-defined elative azimuth angles (in degrees)for off-quadrature output. Ordering is not important. Mustbe between 0 and 180.N_USER_STREAMS Integer (I) Number of user-defined viewing zenith angles. Must benot greater than symbolic dimensionMAX_USER_STREAMS.USER_ANGLES_INPUT Real*8 (I) Array of user-defined viewing zenith angles (in degrees)for off-quadrature output. Must be between 0 and 90degrees.N_USER_OBSGEOMS Integer (I) Number of user-defined observational geometry triplets.Must not be greater than the symbolic dimensionMAX_USER_OBSGEOMS.USER_OBSGEOMS (g,3) Real*8 (I) Array of g user-defined observational geometry triplets (indegrees) for off-quadrature output. It consists of thegeometry triplets (solar zenith angle, viewing angle,relative azimuth angle) for which BRDF quantities aredesired.N_BRDF_KERNELS Integer (I) Number of BRDF kernels to be used (up to 3 allowed).BRDF_NAMES Character (I) Names of BRDF kernels to be used (up to 3 allowed).WHICH_BRDF(k) Integer (I) Index numbers for BRDF kernels to be used (see the file<strong>VLIDORT</strong>.PARS or for values and comments).N_BRDF_PARAMETERS (k) Integer (I) For each kernel k, the number of non-linear parameterscharacterizing kernel shape. Non-zero only for Li-sparse,Li-dense, Hapke, Rahman and Cox-Munk kernels.BRDF_PARAMETERS (k,b) Real*8 (I) For kernel k, and b = 1, N_BRDF_PARAMETERS(k),108
these are the BRDF parameters. E.g.. for Cox-Munk,BRDF_PARAMETERS(k,1) and BRDF_PARAMETERS(k,2)are Wind speed and refractive index respectively.LAMBERTIAN_KERNEL_FLAG Logical (I) Flag to indicate surface is purely Lambertian so onlyLambertian calculations are done internally.BRDF_FACTORS Real*8 (I) Amplitude factor associated with a BRDF kernel.NSTREAMS_BRDF Integer (I) Number of angles used in azimuthal integration duringBRDF calculation.DO_SHADOW_EFFECT Logical (I) If set, calculations for incorporating the Shadow effect forthe sea-surface glitter reflectance BRDF model will bedone. Recommended.DO_EXACT Logical (I) If set, the exact BRDF will be calculated.DO_EXACT_ONLY Logical (I) If set, only the exact BRDF will be calculated (i.e. noFourier calculations).DO_GLITTER_MSRCORR Logical (I) If set, multiple reflectance correction for all terms ofGLITTER kernels will be done.DO_GLITTER_MSRCORR_EXACTONLY Logical (I) If set, multiple reflectance correction for only the exacttermof Glitter kernels will be done.GLITTER_MSRCORR_ORDER Integer (I) Order of correction for multiple reflectance computations (= 0 (no correction), 1, 2, 3, etc…).Warning, using S > 0 can increase CPU time dramatically.GLITTER_MSRCORR_NMUQUAD Integer (I) Number of angles used in zenith integration duringmultiple reflectance correction.GLITTER_MSRCORR_NPHIQUAD Integer (I) Number of angles used in azimuthal integration duringmultiple reflectance correction.Table B1: Type structure VBRDF_Sup_OutputsName Kind/Intent DescriptionEXACTDB_BRDFUNC (S,a,b,s) Real*8 (O) Exact direct bounce BRDF for Stokes vector component S,incident solar angle s, reflected line-of-sight angle a, andrelative azimuth b.BRDF_F_0 (M,S,k,s) Real*8 (O) Fourier components M of total BRDF for Stokes vectorcomponent S, incident solar angle s and reflected discreteordinate k.BRDF_F (M,S,k,j) Real*8 (O) Fourier components M of total BRDF for Stokes vectorcomponent S, incident discrete ordinate j and reflecteddiscrete ordinate k.USER_BRDF_F_0 (M,S,a,s) Real*8 (O) Fourier components M of total BRDF for Stokes vectorcomponent S, incident solar angle s and reflected line-ofsightzenith angle a.USER_BRDF_F (M,S,a,j) Real*8 (O) Fourier components M of total BRDF for Stokes vectorcomponent S, incident discrete ordinate j and reflectedline-of-sight zenith angle a.EMISSIVITY (S,k) Real*8 (O) Surface emissivity for Stokes vector component S andemitted discrete ordinate k.USER_EMISSIVITY (S,a) Real*8 (O) Surface emissivity for Stokes vector component S andemitted line-of-sight zenith angle a.Table B2: Type Structure VBRDF_Input_Exception_HandlingName Kind/Intent DescriptionSTATUS_INPUTREAD Integer (O) Overall status of input read.NINPUTMESSAGES Integer (O) Number of input read error messages.INPUTMESSAGES Character (O) Array of input-read error messages.INPUTACTIONS Character (O) Array of input-read actions to take.109
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User’s GuideVLIDORTVersion 2.6Rob
Page 5 and 6:
Table of Contents1H1. Introduction
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1. Introduction to VLIDORT1.1. Hist
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Table 1.1 Major features of LIDORT
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In 2006, R. Spurr was invited to co
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corrections, and sphericity correct
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Matrix Π relates scattering and in
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m⎛ P⎞l( μ)0 0 0⎜⎟mmm ⎜ 0
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In the following sections, we suppr
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of the single scatter albedo ω and
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Here T n−1 is the solar beam tran
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~ + ~ ~ (1)~ ~ + ~ ~ (2)~ ~ − ~ 1
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The solution proceeds first by the
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Linearizations. Derivatives of all
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For the plane-parallel case, we hav
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One of the features of the above ou
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L↑↑ ↑k (cot n −cotn −1)[
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Note the use of the profile-column
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βl,aer(1)(2)fz1e1βl+ ( 1−f ) z2
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For BRDF input, it is necessary for
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streams were used in the half space
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anded tri-diagonal matrix A contain
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in place to aid with the LU-decompo
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In earlier versions of LIDORT and V
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4. The VLIDORT 2.6 package4.1. Over
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(discrete ordinates), so that dimen
Page 57 and 58: Table 4.2 Summary of VLIDORT I/O Ty
Page 59 and 60: Table 4.3. Module files in VLIDORT
Page 61 and 62: Finally, modules vlidort_ls_correct
Page 63 and 64: end program main_VLIDORT4.3.2. Conf
Page 65 and 66: $(VLID_DEF_PATH)/vlidort_sup_brdf_d
Page 67 and 68: Finally, the command to build the d
Page 69 and 70: Here, “s” indicates you want to
Page 71 and 72: The main difference between “vlid
Page 73 and 74: to both VLIDORT and the given VSLEA
Page 75 and 76: STATUS_INPUTREAD is equal to 4 (VLI
Page 77 and 78: 5. ReferencesAnderson, E., Z. Bai,
Page 79 and 80: Mishchenko, M.I., and L.D. Travis,
Page 81: Stamnes K., S-C. Tsay, W. Wiscombe,
Page 84 and 85: Table A2: Type Structure VLIDORT_Fi
Page 86 and 87: DO_WRITE_FOURIER Logical (I) Flag f
Page 88 and 89: USER_LEVELS (o) Real*8 (IO) Array o
Page 90 and 91: angle s, Stokes parameter S, and di
Page 92 and 93: DO_SLEAVE_WFS Logical (IO) Flag for
Page 94 and 95: 6.1.1.8. VLIDORT linearized outputs
Page 96 and 97: NFINELAYERS Integer Number of fine
Page 98 and 99: 6.1.2.4. VLIDORT linearized modifie
Page 100 and 101: The output file contains (for all 3
Page 102 and 103: The first call is the baseline calc
Page 104 and 105: for a 2-parameter Gamma-function si
Page 106 and 107: Remark. In VLIDORT, the BRDF is a 4
Page 110 and 111: Table C: Type Structure VBRDF_LinSu
Page 112 and 113: Special note regarding Cox-Munk typ
Page 114 and 115: squared parameter, so that Jacobian
Page 116 and 117: 6.4. SLEAVE SupplementHere, the sur
Page 118 and 119: is possible to define Jacobians wit
Page 120 and 121: etween 0 and 90 degrees.N_USER_OBSG
Page 122: 6.4.4.2 SLEAVE configuration file c
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