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ENVIClassificationAggregationTask

ENVIClassificationAggregationTask

This task aggregates smaller class regions to a larger, adjacent region as part of the classification cleanup.

Example


The following example performs an unsupervised classification, followed by an aggregate operation.

; Start the application
e = ENVI()
 
; Open an input file
File = Filepath('qb_boulder_msi', Subdir=['data'], $
  Root_Dir=e.Root_Dir)
Raster = e.OpenRaster(File)
 
; Create a classification ENVIRaster
ClassTask = ENVITask('ISODATAClassification')
ClassTask.INPUT_RASTER = Raster
ClassTask.Execute
 
; Get the collection of data objects currently available in the Data Manager
DataColl = e.Data
 
; Add the class image to the Data Manager
DataColl.Add, ClassTask.OUTPUT_RASTER
 
; Display the result
View = e.GetView()
Layer = View.CreateLayer(ClassTask.OUTPUT_RASTER)
 
; Run the aggregation task
AggregationTask = ENVITask('ClassificationAggregation')
AggregationTask.INPUT_RASTER = ClassTask.OUTPUT_RASTER
AggregationTask.Execute
 
; Add the output to the Data Manager
DataColl.Add, AggregationTask.OUTPUT_RASTER
 
; Display the result
Layer2 = View.CreateLayer(AggregationTask.OUTPUT_RASTER)
 
; Flicker between the original classification and the classification after
; aggregation
Portal = View.CreatePortal()
Portal.Animate, 2.0, /FLICKER

Syntax


Result = ENVITask('ClassificationAggregation')

Input properties (Set, Get): INPUT_RASTER, MINIMUM_SIZE, OUTPUT_RASTER_URI, AGGREGATE_UNCLASSIFIED

Output properties (Get only): OUTPUT_RASTER

Properties marked as "Set" are those that you can set to specific values. You can also retrieve their current values any time. Properties marked as "Get" are those whose values you can retrieve but not set.

Methods


This task inherits the following methods from ENVITask:

AddParameter

Execute

Parameter

ParameterNames

RemoveParameter

Properties


This task inherits the following properties from ENVITask:

COMMUTE_ON_DOWNSAMPLE

COMMUTE_ON_SUBSET

DESCRIPTION

DISPLAY_NAME

NAME

REVISION

TAGS

This task also contains the following properties:

AGGREGATE_UNCLASSIFIED (optional)

Specify if the unclassified pixels get treated as a class that other pixels can be aggregated into.

INPUT_RASTER (required)

Specify a classification raster on which to perform aggregation.

MINIMUM_SIZE (optional)

Specify the aggregate minimum size in pixels. Regions with a size of this value or smaller are aggregated to an adjacent, larger region. The default value is 9.

OUTPUT_RASTER

This is a reference to the output raster of filetype ENVI.

OUTPUT_RASTER_URI (optional)

Specify a string with the fully qualified filename and path of the associated OUTPUT_RASTER. If you do not specify this property, or set it to an exclamation symbol (!), a temporary file will be created.

Version History


ENVI 5.2

Introduced

ENVI 5.5 Added AGGREGATE_UNCLASSIFIED property

API Version


3.3

See Also


ENVITask, ENVITask::Parameter, ENVISubsetRaster, ENVIISODATAClassificationTask, ENVIClassificationSmoothingTask



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