StdDev

摘要

创建栅格对象,其中每个像素包含多个栅格中的标准差值。

说明

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

StdDev (rasters, {extent_type}, {cellsize_type}, {ignore_nodata}, {process_as_multiband})
参数说明数据类型
rasters
[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.

  • FirstOfThe output extent will be defined using the extent of the first input raster.
  • LastOfThe output extent will be defined using the extent of the last input raster.
  • IntersectionOfThe output extent will be defined as the intersecting area of the input rasters.
  • UnionOfThe 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.

  • FirstOfThe output pixel size will be defined using the pixel size of the first input raster.
  • LastOfThe output pixel size will be defined using the pixel size of the last input raster.
  • MaxOfThe output pixel size will be defined using the maximum pixel size of the input rasters.
  • MeanOfThe output pixel size will be defined using the mean of both input rasters.
  • MinOfThe output pixel size will be defined using the minimum pixel size of the input rasters.

(默认值为 FirstOf)

String
ignore_nodata

Specifies whether NoData values will be ignored in the calculation.

  • True—The analysis will include all valid pixels in the input rasters and ignore any NoData pixels.
  • False—The analysis will result in NoData if there are any NoData values for the pixels in the input rasters.

(默认值为 False)

Boolean
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

标准差示例

计算三个多波段栅格的标准差。

from arcpy.ia import * 

rc = RasterCollection([landsat_1, landsat_2, landsat_3]) 

range_raster = StdDev(rc, extent_type = "UnionOf", cellsize_type = "MinOf", 
	ignore_nodata = True, process_as_multiband = True)