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basic_usage [2013/10/23 12:11]
arve |
basic_usage [2017/09/13 10:37]
admin [Basic Usage] |
| want to become familiar with. A description of uvspec is provided | want to become familiar with. A description of uvspec is provided |
| in the first part of the | in the first part of the |
| [[http://www.libradtran.org/experimental/doku.php?id=documentation|manual]]. Examples | [[http://www.libradtran.org/doku.php?id=documentation|manual]]. Examples |
| of its use, including various input files and corresponding output | of its use, including various input files and corresponding output |
| files for different atmospheric conditions, are provided in the | files for different atmospheric conditions, are provided in the |
| === 1. Wavelength grid / band parameterization === | === 1. Wavelength grid / band parameterization === |
| First you need to think about the spectral range and spectral | First you need to think about the spectral range and spectral |
| resolution required for your calculation. As long as you stay in the | resolution required for your calculation. Per default the REPTRAN absorption parameterization is used which is available for the full spectral range from the UV to the far IR. In the ultraviolet or the lower visible spectral range molecular absorption varies smoothly with |
| ultraviolet or the lower visible spectral range you don't need to | |
| consider anything. Molecular absorption varies smoothly with | |
| wavelength in this range and a calculation with 0.5 or 1nm step width | wavelength in this range and a calculation with 0.5 or 1nm step width |
| should be sufficient. Above 500nm, however, absorption by water | should be sufficient. Above 500nm, however, absorption by water |
| is not feasible for most applications (such a //line-by-line// | is not feasible for most applications (such a //line-by-line// |
| calculation is possible, however, if you provide your own spectral | calculation is possible, however, if you provide your own spectral |
| absorption cross section). For most applications you need to select a | absorption cross sections). For most applications you have to use a |
| parameterization for molecular absorption, for example the | parameterization for molecular absorption, for example the |
| representative wavelengths parameterization, e.g. **mol_abs_param | representative wavelengths parameterization, e.g. **mol_abs_param |
| repwvl** which allows pseudo-spectral calculations (meaning that you | reptran** which is used by default and which allows pseudo-spectral calculations (meaning that you |
| still can calculate | still can calculate |
| radiation at any wavelength you want, but the gas absorption is | radiation at any wavelength you want, but the gas absorption is |
