ThermalAtmosphericCorrection Task

This task removes the atmospheric contributions from thermal infrared radiance data. Thermal image data must be converted to radiance before performing this atmospheric correction.

Example

; Start the application

e = ENVI()

; Open an input file

File = Filepath('qb_boulder_msi', Subdir=['data'], $

  Root_Dir=e.Root_Dir)

Raster = e.OpenRaster(File)

; Get the task from the catalog of ENVITasks

Task = ENVITask('ThermalAtmosphericCorrection')

; Define inputs

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('ThermalAtmosphericCorrection')

Input properties (Set, Get): DATA_SCALE, FITTING_TECHNIQUE, NESR, INPUT_RASTER, OUTPUT_RASTER_URI, REGRESSION_METHOD

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

DATA_SCALE (optional)

Specify the scale factor applied to the data, prior to calculating thermal corrections. This converts the input data to units of W/m²/μm/sr. Valid values are:

1.0 (default)
0.01
0.001

FITTING_TECHNIQUE (required)

Specify the method for fitting the line in the data gain and offset calculations. The options are:

Top of Bin (the default)
Normalized Regression

INPUT_RASTER (required)

Specify an input raster to process.

NESR (optional)

Specify the Noise Equivalent Spectral Radiance value (NESR). You must specify this value if the FITTING_TECHNIQUE value is Normalized Regression. The default value is 1.00000.

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 to export the associated OUTPUT_RASTER.

If you set this property to an asterisk symbol (*), the output raster will be virtual and not written to disk.
If you do not specify this property, or set it to an exclamation symbol (!), a temporary file will be created.

REGRESSION_METHOD (required)

Specify the regression method in the data gain and offset calculations. The options are:

All Pixels (the default)
Maximum Hit

Version History

ENVI 5.7

Introduced

API Version

4.3