TopographicModeling Task

This task performs topographic modeling on an input DEM.

Example

; Start the application

e = ENVI()

; Open an input file

File = Filepath('bhdemsub.img', $

  Subdir=['classic','data'], Root_Dir=e.Root_Dir)

Raster = e.OpenRaster(File)

; Get the task from the catalog of ENVITasks

Task = ENVITask('TopographicModeling')

; Define inputs

Task.INPUT_RASTER = Raster

Task.AZIMUTH = 60d

Task.ELEVATION = 60d

Task.KERNEL_SIZE = 3

; Run the task

Task.Execute

; Get the data collection

DataColl = e.Data

; Add the output to the data collection

DataColl.Add, Task.OUTPUT_RASTER

; Display the result

View = e.GetView()

Layer = View.CreateLayer(Task.OUTPUT_RASTER)

Syntax

Result = ENVITask('TopographicModeling')

Input properties (Set, Get): AZIMUTH, ELEVATION, INPUT_RASTER, KERNEL_SIZE, OUTPUT_RASTER_URI, PIXEL_SIZE, PRODUCTS

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:

Properties

This task inherits the following properties from ENVITask:

COMMUTE_ON_DOWNSAMPLE

AZIMUTH (optional)

Specify the azimuth angle of the model in degrees. The value will only be used for the Shaded Relief product. The default value is 0.

ELEVATION (optional)

Specify the elevation angle of the model in degrees. The value will only be used for the Shaded Relief product. The default value is 0.

INPUT_RASTER (required)

Specify a raster on which to perform topographic modeling.

KERNEL_SIZE (optional)

Specify the size of the kernel used for processing. The default value is 3.

OUTPUT_RASTER

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

OUTPUT_RASTER_URI (required)

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.

PIXEL_SIZE (optional)

Specify a double-precision array with the X and Y pixel size of the input raster, in meters.

PRODUCTS (optional)

Specify a string array with the products to calculate. By default, all products will be calculated.

Slope
Aspect
Shaded Relief
Profile Convexity
Plan Convexity
Longitudinal Convexity
Cross Sectional Convexity
Minimum Curvature
Maximum Curvature
RMS
Slope Percent

See Background for descriptions of the options.

Version History

ENVI 5.5

Introduced

API Version

4.2