RasterThresholdToVector Task

This task vectorizes the result of thresholding a raster.

Example

; Start the application

e = ENVI()

; Open an input file

File = Filepath('qb_boulder_pan', Subdir=['data'], Root_Dir=e.Root_Dir)

Raster = e.OpenRaster(File)

; Create a threshold Vector

Task = ENVITask('RasterThresholdToVector')

Task.INPUT_RASTER = Raster

Task.THRESHOLD_MIN = 1000

Task.Execute

; Get the collection of data objects currently available in the Data Manager

DataColl = e.Data

; Add the output to the Data Manager

DataColl.Add, Task.OUTPUT_VECTOR

; Display the result

View = e.GetView()

Layer1 = View.CreateLayer(Raster)

Layer2 = View.CreateLayer(Task.OUTPUT_VECTOR)

View.Zoom, /FULL_EXTENT

Syntax

Result = ENVITask('RasterThresholdToVector')

Input properties (Set, Get): INPUT_RASTER, KERNEL_SIZE, MINIMUM_PIXELS, THRESHOLD_MIN, THRESHOLD_MAX

Output properties (Get only): OUTPUT_VECTOR

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:

Properties

This task inherits the following properties from ENVITask:

COMMUTE_ON_DOWNSAMPLE

INPUT_RASTER (required)

Specify a single-band raster to vectorize.

KERNEL_SIZE (optional)

The smooth kernel size, using an odd number (e.g., 3 = 3x3 pixels). If set to 0, no smoothing will be performed. The default is 3.

MINIMUM_PIXELS (optional)

Specify the minimum size in pixels. Regions with fewer pixels than this value will be set to 0. The default is 3.

THRESHOLD_MIN (optional)

Specify a value for the minimum threshold. Pixels lower than this value will be set to 0.

THRESHOLD_MAX (optional)

Specify a value for the maximum threshold. Pixels higher than this value will be set to 0.

OUTPUT_VECTOR

This is a reference to the output vector.

OUTPUT_VECTOR_URI (optional)

Specify a string with the fully qualified path and filename for OUTPUT_VECTOR.

Version History

ENVI 5.6.3

Introduced

API Version

4.3