pybsm.utils.load_database_atmosphere

pybsm.utils.load_database_atmosphere(*, altitude: float, ground_range: float, ihaze: int) → ndarray

Linear interpolation of the pre-calculated MODTRAN atmospheres.

See the original ‘load_database_atmosphere’ (now commented out) for more details on the outputs. NOTE: This is experimental code. Linear interpolation between atmospheres may not be a good approximation in every case!!!!

Parameters:

altitude – sensor height above ground level in meters
ground_range – distance on the ground between the target and sensor in meters. The following ground ranges are included in the database at each altitude until the ground range exceeds the distance to the spherical earth horizon: 0 100 500 1000 to 20000 in 1000 meter steps, 22000 to 80000 in 2000 m steps, and 85000 to 300000 in 5000 meter steps.
ihaze – MODTRAN code for visibility, valid options are ihaze = 1 (Rural extinction with 23 km visibility) or ihaze = 2 (Rural extinction with 5 km visibility)

Returns:

atm[:,0]:: wavelengths from .3 to 14 x 10^-6 m in 0.01x10^-6 m steps
atm[:,1]:: (TRANS) total transmission through the defined path.
atm[:,2]:: (PTH THRML) radiance component due to atmospheric emission and scattering received at the observer.
atm[:,3]:: (SURF EMIS) component of radiance due to surface emission received at the observer.
atm[:,4]:: (SOL SCAT) component of scattered solar radiance received at the sobserver.
atm[:,5]:: (GRND RFLT) is the total solar flux impingent on the ground and reflected directly to the sensor from the ground. (direct radiance + diffuse radiance) * surface reflectance

NOTE:

units for columns 1 through 5 are in radiance W/(sr m^2 m)