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 Tool.

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 properties (Set, Get): INDEX_1, INDEX_2, INDEX_3, INPUT_RASTER, MINIMUM_NDVI, 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:

INDEX_1 (required)

Specify a vegetation index from the Broadband or Narrowband 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 or Canopy 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 Efficiency or Leaf 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

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

ENVI 5.6.3

Introduced

API Version

4.2

See Also

ENVITask, FireFuelClassification Task, ForestHealthClassification Task, VegetationDelineation Task