LessThanFrequency

汇总

创建栅格对象，其中每个像素包含栅格集小于另一个栅格的次数。

讨论

有关此函数工作原理的详细信息，请参阅 小于频数 工具。

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

LessThanFrequency(value_raster, rasters, {extent_type}, {cellsize_type}, {process_as_multiband})

参数	说明	数据类型
value_raster	A value raster that will be referenced by the list of input rasters.	Raster
rasters	The list of input rasters.	Raster
extent_type	The method that will be used to compute the extent of the output when the input rasters have different extents. FirstOf—The output extent will be defined using the extent of the first input raster. LastOf—The output extent will be defined using the extent of the last input raster. IntersectionOf—The output extent will be defined as the intersecting area of the input rasters. UnionOf—The output extent will be defined as the total extent of the input rasters. (默认值为 FirstOf)	String
cellsize_type	The method that will be used to compute the pixel size of the output when the input rasters have different pixel sizes. FirstOf—The output pixel size will be defined using the pixel size of the first input raster. LastOf—The output pixel size will be defined using the pixel size of the last input raster. MaxOf—The output pixel size will be defined using the maximum pixel size of the input rasters. MeanOf—The output pixel size will be defined using the mean of both input rasters. MinOf—The output pixel size will be defined using the minimum pixel size of the input rasters. (默认值为 FirstOf)	String
process_as_multiband	Specifies how the bands of the input rasters will be processed. True—Each multiband raster will be processed as a multiband raster. The operation will be performed for each band from one input using the corresponding band number from other inputs. False—Each band from a multiband raster input will be processed separately as a single-band raster. (默认值为 False)	Boolean

返回值

数据类型	说明
Raster	输出栅格。

代码示例

LessThanFrequency 示例

计算输入栅格集小于值栅格的次数。

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

#Set the local variables
value_raster = r"c:\temp\value_raster.tif"

rasters = [r"c:\temp\raster1.tif", r"c:\temp\raster2.tif", r"c:\temp\raster3.tif"]

# Run
LessThan_raster = LessThanFrequency(value_raster, rasters, "UnionOf", "FirstOf", True)