文件列表:

brdf\interp.f (12518, 2003-08-18)
brdf\interp.write (58632, 2003-08-18)
brdf\macke.column.write (37785, 2003-08-18)
brdf\macke.smooth.write (42837, 2003-08-18)
brdf\refl.f (36741, 2003-08-18)
brdf\refl.print (10023, 2003-08-18)
brdf\spher.f (65839, 2003-08-18)
brdf\spher.print (58406, 2003-08-18)
brdf\spher.write (54593, 2003-08-18)
brdf (0, 2010-10-28)

The following codes/data/texts are from http://www.giss.nasa.gov/~crmim/brf/ The bidirectional reflection function for a semi-infinite homogeneous slab composed of arbitrarily shaped, randomly oriented particles based on a rigorous numerical solution of the radiative transfer equation. The code brf.f solves the Ambartsumian's nonlinear integral equation for the reflection function using a simple iterative method. Since this technique bypasses the computation of the internal field, it is by far the fastest and most accurate numerical approach available. The codes are ideally suitable to computing the BRF for flat snow, soil, and powder surfaces and optically thick clouds and may find many applications in geophysics, physics, biophysics, and industrial research. A detailed user manual to the codes was published in JQSRT: M. I. Mishchenko, J. M. Dlugach, E. G. Yanovitskij, and N. T. Zakharova, Bidirectional reflectance of flat, optically thick particulate layers: An efficient radiative transfer solution and applications to snow and soil surfaces, J. Quant. Spectrosc. Radiat. Transfer, vol. 63, 409-432 (1999). This paper is available from Michael Mishchenko upon request and is also available at this web site in the PDF/PostScript format. To receive a hard copy of the manual, please leave a message at crmim@giss.nasa.gov indicating your name and mailing address. The users of the codes are encouraged to visit this page on a regular basis for information on latests developments, warnings, and/or errors found. We would highly appreciate informing us of any problems and errors encountered with these codes. Please e-mail your questions and comments to crmim@giss.nasa.gov. FORTRAN CODES refl.f - This code computes Fourier components of the reflection function interp.f - This code computes the bidirectional reflection function for a given set of scattering geometries spher.f - This code computes the Legendre expansion coefficients for polydisperse spherical particles using the standard Lorenz-Mie theory The codes must be run in the following sequence: spher.f -> refl.f -> interp.f. Note that the Legendre expansion coefficients for polydisperse, randomly oriented nonspherical particles and sphere aggregates can be computed using T-matrix codes collected at http://www.giss.nasa.gov/~crmim . The expansion coefficients for the standard and double-peaked Henyey-Greenstein phase functions are computed using Eqs. (15) and (19) of the manual. Below we also provide the Legendre expansion coefficients for two nonspherical ice particle models described in the manual. BENCHMARK RESULTS The following output files were computed by the codes in their current settings and may provide a useful test of the performance of the codes on different computers: spher.print spher.write refl.print interp.write The file refl.write is not given here because of its large size. LEGENDRE COEFFICIENTS FOR TWO ICE PARTICLE MODELS Hexagonal columns (macke.column.write) Random fractal crystals (macke.smooth.write) CONTACT Please address all inquires about this research to Dr. Michael Mishchenko at crmim@stokes.giss.nasa.gov

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