ZonalRemap

Résumé

Categorizes the pixel values of a raster object into groups based on zones defined in another raster and zone-dependent value mapping defined in a table.

Discussion

For more information about how this function works, see the Zonal Remap raster 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

ZonalRemap (raster, zonal_attribute_table, {zone_raster}, {zone_field}, {min_value_field_name}, {max_value_field_name}, {output_value_field_name}, {background_value}, {default_output_value}, {where_clause})

Paramètre	Explication	Type de données
raster	A single-band raster input containing pixel values to remap.	Raster
zonal_attribute_table	A table containing at least three fields. The table must have a minimum threshold value, a maximum threshold value, and a target value. The target value is the name of the field that will contain the remapped value. The format of the input can be a feature class, feature service, or any table type that ArcGIS supports.	String
zone_raster	A single-band raster, where each pixel defines zones associated with a particular location. A zone is defined as all areas in the input that have the same value. The areas do not have to be contiguous. (La valeur par défaut est None)	RasterCollection
zone_field	The field name in the zonal_attribute_table that contains the zone ID values. The zone ID values are directly tied to the zone IDs in your zonal raster. The zone ID values provide another level of filtering while remapping. If there is no zone ID associated with a particular record in the table, it will not participate in the remapping. (La valeur par défaut est 'ZoneID')	String
min_value_field_name	The field name containing the minimum value above which an input pixel is remapped. If left unspecified, or if the field value is null, pixel values are not tested for minimum. (La valeur par défaut est 'ZoneMin')	String
max_value_field_name	The field name containing the maximum value below which an input pixel is remapped. If left unspecified, or if the field value is null, pixel values are not tested for maximum. (La valeur par défaut est 'ZoneMax')	String
output_value_field_name	The field name containing the target value to which an input pixel is remapped. If left unspecified, or if the field value is null, remapped pixel values are set to default_output_value. (La valeur par défaut est 'ZoneValue')	String
background_value	The initial pixel value of the output raster, before input pixels are remapped. (La valeur par défaut est 0)	String
default_output_value	The value that will be assigned to a pixel that does not satisfy any of the conditions set in the zonal_attribute_table. This value will also be the value of the output pixel if either the output_value_field_name parameter is left unspecified or the output value of the corresponding zonal threshold is left unspecified in the zonal_attribute_table. (La valeur par défaut est 255)	String
where_clause	A query applied to the zonal_attribute_table. (La valeur par défaut est None)	String

Valeur renvoyée

Type de données	Explication
Raster	The remapped raster object.

Exemple de code

Zonal Remap example

Remap pixels in a raster according to zones defined in another raster, or zone-dependent values defined in a table.

from arcpy.sa import *
out_zonalremap_raster = ZonalRemap("cloudceilings.tif","zonal.csv", "zone.tif")
out_zonalremap_raster.save("C:/arcpyExamples/outputs/Zonal_remap.tif")

Zonal Remap example

Remap pixels in a raster according to zones defined in another raster, or zone-dependent values defined in a table.

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

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

# Set the local variables
in_raster = "NDVI.tif"
zonal_attribute_table = "zonal.csv"
zone_raster = "neighborhoods.tif"

# Apply ZonalRemap function
zonal_remap_raster = ZonalRemap(in_raster, zonal_attribute_table, zone_raster)

# Save the output
zonal_remap_raster.save("C:/arcpyExamples/outputs/NDVI.tif")