This task performs raster calculations of topographic breaklines.
For additional details on topographic breaklines, see Topographic Breaklines.
Example
e = ENVI()
File = FILEPATH(bhdemsub.img', $
SUBDIRECTORY=['classic','data'], $
ROOT_DIR=e.ROOT_DIR)
Raster = e.OpenRaster(File)
Task = ENVITask('TopographicBreaklines')
Task.INPUT_RASTER = Raster
Task.Execute
DataColl = e.Data
DataColl.Add, Task.OUTPUT_RASTER
View = e.GetView()
Layer = View.CreateLayer(Task.OUTPUT_RASTER)
Syntax
Result = ENVITask('TopographicBreaklines')
Input properties (Set, Get): INPUT_RASTER, KERNEL_SIZE, OUTPUT_URI
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:
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_RASTER
This is a reference to the output raster of filetype ENVI.
OUTPUT_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
API Version
4.3
See Also
ENVITask, TopographicFeatures Task