Atmospheric Modeling Using PcModWin©/MODTRAN®.
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Atmospheric Modeling Using PcModWin©/MODTRAN® | () | Stotts | Publications | Spie.matlab-modtran-5/Mod5.m at master · derekjgriffith/matlab-modtran-5 · GitHub |
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Spectral transmittance with Angstrom's law 3. Chapter 4 Atmospheric Spectral Radiance 4. Chapter 8 Special Topics 8. Atmospheric modeling has been important to systems analysis and remote-sensing applications for decades. It uses a generalized geometry package to describe atmospheric absorption, scattering, and emission paths, leveraging either included databases describing 1 atmospheric profiles, 2 atmospheric aerosols, and 3 water- and ice-cloud representations, or user-defined atmospheres and characteristics.
Its spectral coverage spans the optical wavelength range from the near-ultraviolet UV through the far-infrared IR. It has several hundred interconnected inputs. Its s "computer card" and JSON input structure is rather involved, requiring precision to enter the entries in the right place and format. It also offers no easy means to see if your inputs are correct because of its antiquated data input structure. More significantly, it requires expertise to choose the set of inputs and parameters to employ, which exacerbates the problem setup, input file proofing, and error determination.
The major error sources in MODTRAN atmospheric modeling include omissions of major effects, incorrect definition of the problem, and inadequate description of the atmosphere. It allows the user to quickly review and understand the parameters used by their input file.
Unfortunately, neither program's instruction manual provides beginners with the expertise and understanding of what numbers to use in calculations. The PcModWin addendums give some insight, but those sections are meant for intermediate and expert atmospheric modelers. Atmospheric radiative transport typically is not their field of expertise, but they need accurate estimations of the atmospheric effects to do their "real job.
This book is designed primarily for these users: the theories of molecular absorption, aerosol scattering, multiple scattering, BDRF, etc. This book will tell you how to quickly set up your scenario calculation and interpret the results with a high degree of confidence. PcModWin will generate all of these files with proper formatting automatically for you. For most people, filling out an input window like the one above is easier than editing a text file like this!
Please see test case 1. Berk, J. Hawes, T. Perkins, P. Conforti, G. Anderson, R. Kennett, and P. Reformulating the band model parameters and radiative transfer formalism to increase the resolution of MODTRAN spectral calculations to 0. Adding separate flux and atmospheric correction data,. Adding option to model line center data via 2 pairs of absorption coefficient and line spacing band model parameters.
Introducing a much improved algorithm for computing the finite bin Voigt transmittance. Adding option to use distinct temperature grid data for each auxiliary Y species. Adding atmospheric correction data to the channel spectra output. Replacing the spherical refractive geometry package with an iterative circular arc algorithm for improved accuracy.
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