This task performs convolution filtering on a raster. If the convolution operation requires points outside of the raster, then the nearest edge points of the raster will be used.
Example
e = ENVI()
File = Filepath('qb_boulder_msi', Subdir=['data'], $
Root_Dir=e.Root_Dir)
Raster = e.OpenRaster(File)
Task = ENVITask('RasterConvolution')
Task.INPUT_RASTER = Raster
kernelSize = [3, 3]
kernel = REPLICATE(-1., kernelSize[0], kernelSize[1])
kernel[1, 1] = 8.
Task.KERNEL = kernel
Task.Execute
DataColl = e.Data
DataColl.Add, Task.OUTPUT_RASTER
View = e.GetView()
Layer = View.CreateLayer(Task.OUTPUT_RASTER)
Syntax
Result = ENVITask('RasterConvolution')
Input properties (Set, Get): ADD_BACK, INPUT_RASTER, KERNEL, OUTPUT_RASTER_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:
ADD_BACK (optional)
Specify a filter add-back percentage value between 0.0 and 1.0. A value of 1.0 is equal to 100%.
INPUT_RASTER (required)
Specify a raster on which to perform convolution filtering.
KERNEL (required)
Specify a two-element, double-precision array as the kernel.
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
API Version
4.3
See Also
ENVITask, DirectionalFilter Task, DirectionalKernel Task, GaussianHighPassFilter Task, GaussianHighPassKernel Task, GaussianLowPassKernel Task, GaussianLowPassFilter Task, HighPassFilter Task, HighPassKernel Task, LaplacianFilter Task, LaplacianKernel Task, LowPassFilter Task, LowPassKernel Task, MedianFilter Task, SobelFilter Task, RobertsFilter Task