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})`
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.sa 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.sa 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")``````