# WindChill

## Resumen

Identifies dangerous winter conditions that, depending on exposure times to the elements, can result in frostbite or hypothermia.

## Debate

The formula the function uses to compute wind chill is as follows:

``Wind Chill = 35.74 + (0.6215 * T) - (35.75 * WS^0.16) + (0.4275 * T * WS^0.16)``
• T = Air Temperature in degrees Fahrenheit
• WS = Wind speed in miles per hour

The referenced raster dataset for the raster object is temporary. To make it permanent, you can call the raster object's save method.

## Sintaxis

`WindChill (temperature_raster, wind_speed_raster, {temperature_units}, {wind_speed_units}, {wind_chill_units})`
 Parámetro Explicación Tipo de datos temperature_raster[temperature_raster,...] Un ráster de una única banda en el que los valores de píxeles representan la temperatura ambiente del aire. Raster wind_speed_raster[wind_speed_raster,...] A single-band raster where pixel values represent wind speed. Raster temperature_units La unidad de medida asociada al ráster de temperatura de entrada. Las unidades de entrada disponibles son Celsius, Fahrenheit y Kelvin.(El valor predeterminado es Fahrenheit) String wind_speed_units Defines the unit of measurement for the wind-speed raster: mph —Miles per hourkm/h —Kilometers per hourm/s —Meters per secondft/s —Feet per secondkn —Knots(El valor predeterminado es mph) String wind_chill_units La unidad de medida asociada al ráster de salida. Las unidades de salida disponibles son Celsius, Fahrenheit y Kelvin.(El valor predeterminado es Fahrenheit) String
Valor de retorno
 Tipo de datos Explicación Raster The output raster.

## Muestra de código

WindChill example 1

Calculates wind chill based on the temperature and wind speed from the input raster.

``````from arcpy.ia import *
out_windchill_raster = WindChill("temperature.tif", "windspeed.tif", "",
"km/h", "Celsius")
out_windchill_raster.save("C:/arcpyExamples/outputs/wind_chill_C.tif")``````
WindChill example 2

Calculates wind chill based on the temperature and wind speed from the input raster.

``````# Import system modules
import arcpy
from arcpy.ia import *

# Set the analysis environments
arcpy.env.workspace = "C:/arcpyExamples/data"

# Set the local variables
in_temperature_raster = "temperature.tif"
in_wind_speed_raster  = "windspeed.tif"

# Execute WindChill function
out_windchill_raster = WindChill(in_temperature_raster, in_wind_speed_raster,
"", "knots", "Kelvin")
# Save the output
out_windchill_raster.save("C:/arcpyExamples/outputs/wind_chill_K.tif")``````