Time in daylight

Calculates the proportion of time a location is not within an area of shadow.

Usage

wbt_time_in_daylight(
  dem,
  output,
  lat,
  long,
  az_fraction = 10,
  max_dist = 100,
  utc_offset = "00:00",
  start_day = 1,
  end_day = 365,
  start_time = "00:00:00",
  end_time = "23:59:59",
  wd = NULL,
  verbose_mode = NULL,
  compress_rasters = NULL,
  command_only = FALSE
)

Arguments

dem

Input raster DEM file.

output

Output raster file.

lat

Centre point latitude.

long

Centre point longitude.

az_fraction

Azimuth fraction in degrees.

max_dist

Optional maximum search distance. Minimum value is 5 x cell size.

utc_offset

UTC time offset, in hours (e.g. -04:00, +06:00).

start_day

Start day of the year (1-365).

end_day

End day of the year (1-365).

start_time

Starting hour to track shadows (e.g. 5, 5:00, 05:00:00). Assumes 24-hour time: HH:MM:SS. 'sunrise' is also a valid time.

end_time

Ending hour to track shadows (e.g. 21, 21:00, 21:00:00). Assumes 24-hour time: HH:MM:SS. 'sunset' is also a valid time.

wd

Changes the working directory. Default: NULL will use the value in WhiteboxTools settings, see wbt_wd() for details.

verbose_mode

Sets verbose mode. If verbose mode is FALSE, tools will not print output messages. Default: NULL will use the value in WhiteboxTools settings, see wbt_verbose() for details.

compress_rasters

Sets the flag used by 'WhiteboxTools' to determine whether to use compression for output rasters. Default: NULL will use the value in WhiteboxTools settings, see wbt_compress_rasters() for details.

command_only

Return command that would be executed by system() rather than running tool. Default: FALSE.

Value

Returns the tool text outputs.