This task performs raster calculations of topographic breaklines.

For additional details on topographic breaklines, see Topographic Breaklines.

Example


; Start the application
e = ENVI()
 
; Open an input file
File = FILEPATH(bhdemsub.img', $
  SUBDIRECTORY=['classic','data'], $
  ROOT_DIR=e.ROOT_DIR)
Raster = e.OpenRaster(File)
 
; Get the task from the catalog of ENVITasks
Task = ENVITask('TopographicBreaklines')
; Define the input raster
Task.INPUT_RASTER = Raster
; Run the task
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_RASTER
 
; Display the result
View = e.GetView()
Layer = View.CreateLayer(Task.OUTPUT_RASTER)

Syntax


Result = ENVITask('TopographicBreaklines')

Input parameters (Set, Get): INPUT_RASTER, KERNEL_SIZE, OUTPUT_URI

Output parameters (Get only): OUTPUT_RASTER

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

Input Parameters


INPUT_RASTER (required)

Specify a digital elevation model raster on which to calculate topographic breaklines.

KERNEL_SIZE (optional)

Specify the size of the kernel that will be used to calculate the breakline values. Permitted values are 5, 9, 17, and 33. The default value is 9.

OUTPUT_URI (optional)

Specify a string with the fully qualified filename and path of the associated OUTPUT_RASTER.

  • If you do not specify this parameter, or set it to an exclamation symbol (!), ENVI creates a temporary file.
  • If you set it to the hash symbol (#), ENVI creates a file in the temporary directory, but this file will not be deleted when ENVI closes.

Output Parameters


OUTPUT_RASTER

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

Methods


Execute

Parameter

ParameterNames

Properties


DESCRIPTION

DISPLAY_NAME

NAME

REVISION

TAGS

Version History


ENVI 6.1

Introduced

See Also


ENVITask, TopographicFeatures Task, Masking Support in ENVITasks