The variable MODEL selects one of the predefined model atmospheres or specified from radiosonde data, thus defining the vertical structure of the atmosphere in terms of pressure, temperature and gas concentration (specifically H2O and O3). The available options are shown in the Table below:
Value(s) | Description |
---|---|
0 |
No Gaseous Absorption |
1 |
Tropical *
|
2 |
Mid-Latitude Summer * Default value
|
3 |
Mid-Latitude Winter *
|
4 |
Sub-Arctic Summer *
|
5 |
Sub-Arctic Winter *
|
6 |
US Standard 1962 *
|
-1 |
User's database profile Not yet implemented!
|
8 |
UW and UO3 |
* Same model atmospheres from (McClatchey et al., 1972) as implemented in LOWTRAN and MODTRAN codes.
This variable, therefore, has an impact on the simulation of the absorption-scattering processes at various altitudes in the sun-target-sensor optical path.
The predefined columnar content of H2O and O3 in each model can be overwritten respectively by the key input variables H2O and O3.
McClatchey, R.A., Fenn, R.W., Shelby, J.E.A., Volz, F.E., & Garing, J.S., (1972), "Optical properties of the atmosphere." 3rd Ed., Tech. Rep. AFCRL72-0497, 108 pp. Air Force Geophysics Laboratory, Hanscom AFB, Mass.