UnitConversion

摘要

将像素从一个单位转换到另一个单位。 它支持转换距离、速度和温度。

说明

有关此函数工作原理的详细信息，请参阅单位转换栅格函数。

栅格对象所引用的栅格数据集是临时性的。 要将其设置为永久，可以调用栅格对象的 save 方法。

语法

UnitConversion (raster, {from_unit}, {to_unit})

参数	说明	数据类型
raster	The input raster that will contain the converted units.	Raster
from_unit	The original unit type of the pixels. MetersPerSecond—Meters per second KilometersPerHour—Kilometers per hour Knots—Knots FeetPerSecond—Feet per second MilesPerHour—Miles per hour Celsius—Celsius Fahrenheit—Fahrenheit Kelvin—Kelvin inches—Inches Feet—Feet Yards—Yards Miles—Miles NauticalMiles—Nautical miles Millimeters—Millimeters Centimeters—Centimeters Meters—Meters (默认值为 None)	String
to_unit	The converted unit type of the pixels. MetersPerSecond—Meters per second KilometersPerHour—Kilometers per hour Knots—Knots FeetPerSecond—Feet per second MilesPerHour—Miles per hour Celsius—Celsius Fahrenheit—Fahrenheit Kelvin—Kelvin inches—Inches Feet—Feet Yards—Yards Miles—Miles NauticalMiles—Nautical miles Millimeters—Millimeters Centimeters—Centimeters Meters—Meters (默认值为 None)	String

返回值

数据类型	说明
Raster	输出栅格。

代码示例

UnitConversion 示例 1

本示例将计算从米/秒到千米/小时的输入栅格。

from arcpy.sa import *
out_unit_raster = UnitConversion("wind_speed_meter_per_second.tif",
                                 "MetersPerSecond'", "KilometersPerHour")
out_unit_raster.save("C:/arcpyExamples/outputs/wind_speed_km_per_hour.tif")

UnitConversion 示例 2

本示例将计算从摄氏度到开氏度的输入温度栅格。

# Import system modules
import arcpy
from arcpy.sa import *

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

# Set the local variables
inRaster_File = "temperature_celcius.tif"
from_unit = 'Celsius'
to_unit = 'Kelvin'

# Execute UnitConversion function
out_unit_raster = UnitConversion(inRaster_File, from_unit, to_unit)

# Save the output
out_unit_raster.save("C:/arcpyExamples/outputs/temperature_kelvin.tif")