Disponible avec une licence Image Analyst.
Synthèse
Calculates the geometric median across pixels in a time series of multiband imagery.
Discussion
For more information about how this function works, see the Geometric Median function.
The referenced raster dataset for the raster object is temporary. To make it permanent, you can call the raster object's save method.
Syntaxe
GeometricMedian (rasters, epsilon, {max_iteration}, {extent_type}, {cellsize_type})
Paramètre | Explication | Type de données |
rasters [rasters,...] | The input multiband rasters. | List |
epsilon | The convergence value between two consecutive iterations. When epsilon is less than or equal to the specified value, the iteration will stop, and the result of the last iteration will be used. (La valeur par défaut est 0.001) | Double |
max_iteration | The maximum number of iterations to complete. The computation will end once this value is reached, regardless of the epsilon setting. (La valeur par défaut est 10) | Integer |
extent_type | Specifies the processing extent for the output raster.
(La valeur par défaut est IntersectionOf) | String |
cellsize_type | Specifies the cell size to use in the output raster.
(La valeur par défaut est MaxOf) | String |
Type de données | Explication |
Raster | The output raster object. |
Exemple de code
This example calculates the geometric median from a collection of Landsat images.
# Import system modules
import arcpy
from arcpy.ia import *
# Check out the ArcGIS Image Analyst extension license
arcpy.CheckOutExtension("ImageAnalyst")
# Construct a collection from a mosaic dataset
rc = RasterCollection(r'C:\data.gdb\time_series_landsat_images')
#Execute
geomedian = arcpy.ia.GeometricMedian(rc, {"epsilon": 0.001, "max_iteration": 5, "extent_type":"UnionOf", "CellsizeType": "FirstOf"})
# Save the output
geomedian.save("C:/arcpyExamples/outputs/geomedian_raster.crf")
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