ENVIAgCrops::Dehydrate

The Dehydrate function method returns a hash describing this object. You can use this information in a later ENVI session to restore the object using the object’s static ::Hydrate method or the ENVIHydrate function. For additional information, see What are Hydrate and Dehydrate routines used for?

If you set the URI keyword for ENVIAgCrops, that URI will be used in the dehydrated hash. If you did not specify the URI keyword, a file will be created in ENVI's temporary directory with a .json extension.

This method requires a separate license for the ENVI Crop Science Module; contact your sales representative for more information.

Example

This example counts the crops in an image of emerging cotton plants. It creates an ENVIAgCrops object named outCrops.

; Start the application

e = ENVI(/HEADLESS)

; Open an input file

File = Filepath('Cotton.dat', $

  SUBDIR=['data','crop_science'], $

  ROOT_DIR=e.Root_Dir)

Raster = e.OpenRaster(File)

; Process the green band

subset = ENVISubsetRaster(Raster, BANDS=[1])

; Count the crops and output an ENVIAgCrops object

outCrops = ENVIAgCropCount(subset, 9, 12, $

  GAUSSIAN_FACTOR=0.8, $

  /INCLUDE_EDGES, $

  INTENSITY_THRESHOLD=0.81, $

  NUMBER_OF_INCREMENTS=12, $

  OUTPUT_NCROPS=outputNumCrops, $

  PERCENT_OVERLAP=60)

Result = outCrops.Dehydrate()

Print, Result, /IMPLIED_PRINT

Syntax

Result = ENVIAgCrops.Dehydrate(ERROR=value)

Return Value

This function method returns a hash containing the key/value pairs representing the current object state. You can build your own hash without instantiating an object. To see the required key/value pairs for the object see the object’s Hydrate method.

Arguments

None

Keywords

ERROR

Set this keyword to a named variable that will contain any error message issued during execution of this routine. If no error occurs, the ERROR variable will be set to a null string (''). If an error occurs and the routine is a function, then the function result will be undefined.

When this keyword is not set and an error occurs, ENVI returns to the caller and execution halts. In this case, the error message is contained within !ERROR_STATE and can be caught using IDL's CATCH routine. See IDL Help for more information on !ERROR_STATE and CATCH.

See Manage Errors for more information on error handling in ENVI programming.

Version History

Crop Science 1.0

Introduced