AgriculturalStressClassification Task

This task performs raster classification based on Agricultural Stress Estimate. The result is a map showing the distribution of crop stress.

For additional details on agricultural stress analysis, see Agricultural Stress Classification.

Example

; Start the application

e = ENVI()

; Open an input file

File = Filepath('AVIRISReflectanceSubset.dat', $

Subdir=['data', 'hyperspectral'], $

Root_Dir=e.Root_Dir)

Raster = e.OpenRaster(File)

; Get the task from the catalog of ENVITasks

Task = ENVITask('AgriculturalStressClassification')

; Define inputs

Task.INDEX_1 = 'Normalized Difference Vegetation Index'

Task.INDEX_2 = 'Water Band Index'

Task.INDEX_3 = 'Red Green Ratio Index'

Task.INPUT_RASTER = Raster

; Run the task

Task.Execute

; 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('AgriculturalStressClassification')

Input parameters (Set, Get): INDEX_1, INDEX_2, INDEX_3, INPUT_RASTER, MINIMUM_NDVI, OUTPUT_RASTER_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

INDEX_1 (required)

Specify a vegetation index from the Broadband orNarrowband Greenness Index category. The choices are:

Broadband Greenness:

Difference Vegetation Index
Enhanced Vegetation Index
Global Environmental Monitoring Index
Green Atmospherically Resistant Index
Green Chlorophyll Index
Green Difference Vegetation Index
Green Leaf Index
Green Normalized Difference Vegetation Index
Green Optimized Soil Adjusted Vegetation Index
Green Ratio Vegetation Index
Green Soil Adjusted Vegetation Index
Green Vegetation Index
Infrared Percentage Vegetation Index
Leaf Area Index
Modified Non-Linear Index
Modified Simple Ratio
Modified Soil Adjusted Vegetation Index 2
Non-Linear Index
Normalized Difference Vegetation Index
Optimized Soil Adjusted Vegetation Index
Renormalized Difference Vegetation Index
Soil Adjusted Vegetation Index
Simple Ratio
Sum Green Index", "Transformed Difference Vegetation Index
Triangular Greenness Index
Visible Atmospherically Resistant Index
Wide Dynamic Range Vegetation Index
WorldView Improved Vegetation Index
Atmospherically Resistant Vegetation Index
Modified Chlorophyll Absorption Ratio Index
Modified Chlorophyll Absorption Ratio Index - Improved
Modified Red Edge Normalized Difference Vegetation Index
Modified Red Edge Simple Ratio
Modified Triangular Vegetation Index
Modified Triangular Vegetation Index - Improved
Red Edge Normalized Difference Vegetation Index
Red Edge Position Index
Transformed Chlorophyll Absorption Reflectance Index
Triangular Vegetation Index
Vogelmann Red Edge Index 1
Vogelmann Red Edge Index 2

Narrowband Greenness:

Atmospherically Resistant Vegetation Index
Modified Chlorophyll Absorption Ratio Index
Modified Chlorophyll Absorption Ratio Index - Improved
Modified Red Edge Normalized Difference Vegetation Index
Modified Red Edge Simple Ratio
Modified Triangular Vegetation Index
Modified Triangular Vegetation Index - Improved
Red Edge Normalized Difference Vegetation Index
Red Edge Position Index
Transformed Chlorophyll Absorption Reflectance Index
Triangular Vegetation Index
Vogelmann Red Edge Index 1
Vogelmann Red Edge Index 2

INDEX_2 (required)

Specify a vegetation index from the Canopy Water orCanopy Nitrogen Index category. The choices are:

Canopy Water:

Moisture Stress Index
Normalized Difference Infrared Index
Normalized Difference Water Index
Normalized Multi-band Drought Index
Water Band Index

Canopy Nitrogen:

Normalized Difference Nitrogen Index

INDEX_3 (required)

Specify a vegetation index from the Light Use EfficiencyorLeaf Pigments Index category. The choices are:

Light Use Efficiency:

Photochemical Reflectance Index
Structure Insensitive Pigment Index
Red Green Ratio Index

Leaf Pigments:

Anthocyanin Reflectance Index 1
Anthocyanin Reflectance Index 2
Carotenoid Reflectance Index 1
Carotenoid Reflectance Index 2

INPUT_RASTER (required)

Specify a raster on which to perform Agricultural Stress Estimate classification.

MINIMUM_NDVI (optional)

Specify the value for minimum valid greenness. The default value is 0.00000.

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 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.