Convert radiance to irradiance under a geometry assumption.

Inverse of irradiance2radiance. The geometry argument must match the one used during collection.

Usage

radiance2irradiance(
  L,
  geometry = c("lambertian", "scalar", "collimated", "custom"),
  solid_angle = NULL
)

Arguments

L

Radiance value(s) in W/m^2/sr. Vectorised.

geometry

One of "lambertian" (default), "scalar", "collimated", or "custom". See irradiance2radiance for details.

solid_angle

Finite solid angle in (0, 4 pi] steradians. Required for geometry = "custom" and rejected for other geometries.

Value

Irradiance in W/m^2.

Examples

radiance2irradiance(1)                              # lambertian: E = pi
#> [1] 3.141593
radiance2irradiance(1, "scalar")                    # scalar: E = 2*pi
#> [1] 6.283185
radiance2irradiance(5, "custom", solid_angle = 2)  # E = 10
#> [1] 10