Generate the moon into a lat-long image array patch — generate_moon_image

Produce a rasterised moon texture aligned for composition into the sky dome. The Earth phase is inferred from the Sun-Moon geometry, and earthshine is implemented as an emissive term scaled relative to solar irradiance.

Usage

generate_moon_image_latlong(
  datetime,
  lat,
  lon,
  elev_m = 0,
  width = 800,
  height = 800,
  earthshine = TRUE,
  earthshine_albedo = 0.19,
  solar_irradiance_w_m2 = 1300,
  moon_extinction_kV = 0.172,
  verbose = FALSE
)

Arguments

datetime: POSIXct observation time (UTC).
lat: Latitude in degrees.
lon: Longitude in degrees.
elev_m: Observer elevation above sea level in metres.
width: Output width in pixels.
height: Output height in pixels.
earthshine: Default TRUE. If FALSE, skip the earthshine emissive term.
earthshine_albedo: Default 0.19. Effective Earth albedo term used in the earthshine irradiance approximation.
solar_irradiance_w_m2: Default 1300. Reference solar irradiance at 1 AU (W/m^2) used to normalize earthshine emission intensity.
moon_extinction_kV: Default 0.172. V-band atmospheric extinction coefficient for direct moonlight attenuation.
verbose: Default FALSE. If TRUE, print earthshine diagnostics.