ENVIAgCrops::Remove

The Remove method accepts a crop index or an array of crop indices, and it removes them from the ENVIAgCrops object. It also removes the metrics and radii corresponding to those indices.

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 and removes three crops.

; 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)

 

; Print the number of crops (result is 554)

Print, outCrops.NCROPS

 

; Remove some crop indices

outCrops.Remove, [2,4,6]

 

; Print the number of crops (result is 551)

Print, outCrops.NCROPS

Syntax

ENVIAgCrops.Remove, Index [, ERROR=variable]

Arguments

Index

Specify a zero-based crop index, or an array of crop indices, to remove. For example, specify [0] to remove the first crop in an ENVIAgCrops object. Or, specify an array of [2,4] to remove the third and fifth crops.

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 1.0.1

Introduced

See Also

ENVIAgCrops