Computes image-level corrections

tuav_correct() executes atmospheric corrections. Based on the amount of input different corrections will be done.

Usage

tuav_correct(
  thermal_uav,
  flight_height = NA,
  T_air = NA,
  rel_hum = NA,
  T_bg = NA,
  SKC = TRUE,
  emiss = 0.985
)

Arguments

thermal_uav: ThermalUAV object retrieved by previous functions (e.g.: tuav_create())
flight_height: (numerical) the height between the camera and the OBJECT OF INTEREST. Can be a single value or a vector of the same length as the number of images. If not specified it will search for GPS altitude in the exif/meta data, or use the flight_height calculated in the tuav_loc() function
T_air: (numerical) the air temperature in deg C during the flight. Can be a single value, a vector of same length as the number of images or a data.frame containing temperature data ("T_air") and datetime ("datetime") in UTC ("%d.%m.%Y %H:%M:%OS" format). If not provided the mean temperature of the images will be taken
rel_hum: (numerical) the relative humidity in % during the flight. Can be a single value, a vector of same length as the number of images or a data.frame containing relative humidity data ("rel_hum") and datetime ("datetime") in UTC ("%d.%m.%Y %H:%M:%OS" format). If not provided a value of 50% is assumed across the entire flight.
T_bg: (numerical) the background temperature in Kelvin, temperature measured from the aluminium panel. If not recorded set to NA and the parameter will be estimated using ("T_air"), in this case, you need to specify whether the sky was clear ("SKC" = TRUE) or overcast ("SKC" = FALSE).
SKC: (logical) if the conditions were sky clear, set to TRUE, if there was an overcast set to FALSE (default = TRUE), only needed when T_bg is not specified.
emiss: (numerical) the emissivity, here by default an average for plants is given (0.985)

Value

This function returns an updated ThermalUAV object containing ThermalData which is atmospherically corrected

Usage

Arguments

Value

See also