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WindChill

Zusammenfassung

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

Auswertung

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

For more information about how this function works, see the Wind Chill raster function.

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

Syntax

WindChill (temperature_raster, wind_speed_raster, {temperature_units}, {wind_speed_units}, {wind_chill_units})
ParameterErklärungDatentyp
temperature_raster
[temperature_raster,...]

Ein Einzelband-Raster, in dem Pixelwerte die Umgebungslufttemperatur darstellen.

Raster
wind_speed_raster
[wind_speed_raster,...]

A single-band raster where pixel values represent wind speed.

Raster
temperature_units

Die mit dem Eingabe-Temperatur-Raster verknüpfte Maßeinheit. Die verfügbaren Eingabeeinheiten lauten Celsius, Fahrenheit und Kelvin.

(Der Standardwert ist Fahrenheit)

String
wind_speed_units

Defines the unit of measurement for the wind-speed raster:

  • mphMiles per hour
  • km/hKilometers per hour
  • m/sMeters per second
  • ft/sFeet per second
  • knKnots

(Der Standardwert ist mph)

String
wind_chill_units

Die mit dem Ausgabe-Raster verknüpfte Maßeinheit. Die verfügbaren Ausgabeeinheiten lauten Celsius, Fahrenheit und Kelvin.

(Der Standardwert ist Fahrenheit)

String
Rückgabewert
DatentypErklärung
Raster

The output raster.

Codebeispiel

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")