Median

サマリー

Creates a raster object where each pixel contains the median value across multiple rasters.

構文

Median (rasters, {extent_type}, {cellsize_type}, {ignore_nodata}, {process_as_multiband})
パラメーター説明データ タイプ
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 is defined using the extent of the first input raster.
  • LastOfThe output extent is defined using the extent of the last input raster.
  • IntersectionOfThe output extent is defined as the intersecting area of the input rasters.
  • UnionOfThe output extent is defined as the total extent of the input rasters.

(デフォルト値は次のとおりです 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 is defined using the pixel size of the first input raster.
  • LastOfThe output pixel size is defined using the pixel size of the last input raster.
  • MaxOfThe output pixel size is defined using the maximum pixel size of the input rasters.
  • MeanOfThe output pixel size is defined using the mean of both input rasters.
  • MinOfThe output pixel size is defined using the minimum pixel size of the input rasters.

(デフォルト値は次のとおりです FirstOf)

String
ignore_nodata

Specifies whether to ignore NoData values 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.

(デフォルト値は次のとおりです False)

Boolean
process_as_multiband

Specifies how the bands of the input rasters are 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.

(デフォルト値は次のとおりです False)

Boolean
戻り値
データ タイプ説明
Raster

The output raster.

コードのサンプル

Median example

Calculates the median value across three multiband rasters.

from arcpy.ia import * 

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

mean_raster = Median(rc, extent_type = "UnionOf", cellsize_type = "MinOf", 
		ignore_nodata = True, process_as_multiband = True)

このトピックの内容