deltaN_N0_from_map

pycraf.pathprof.deltaN_N0_from_map(lon, lat)

Query delta_N and N_0 values from digitized maps by means of bilinear interpolation.

Parameters:

lon, latQuantity

Geographic longitude and latitude of path center [deg]

Returns:

delta_NQuantity

Average radio-refractive index lapse-rate through the lowest 1 km of the atmosphere [N-units/km == 1/km]

N_0Quantity

Sea-level surface refractivity [N-units == dimless]

Notes

• The values for delta_N and N_0 are queried from a radiometeorological map provided with ITU-R Rec. P.452.