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Harris Geospatial / Docs Center / ENVI API / Crop Science / ENVIAgCrops::Remove

ENVIAgCrops::Remove

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 is part of ENVI Crop Science, which requires a separate license and installation.

Example


This example counts the crops in a spectral index image of a citrus orchard. It creates an ENVIAgCrops object named outCrops and removes three crops.

; Start the application
e = ENVI(/HEADLESS)
 
; Open an input file
File = Filepath('CitrusOrthophoto.dat', $
  Subdir=['data','crop_science'], $
  Root_Dir=e.Root_Dir)
Raster = e.OpenRaster(File)
 
; Preprocess the image so that crops are bright.
MTVIImage = ENVISpectralIndexRaster(Raster, 'MTVI')
 
; Count the crops and output an ENVIAgCrops object
outCrops = ENVIAgCropCount(MTVIImage, 2.0, 5.0, $
  GAUSSIAN_FACTOR = 0, $
  /INCLUDE_EDGES, $
  INTENSITY_THRESHOLD = 0.8, $
  NUMBER_OF_INCREMENTS = 4, $
  PERCENT_OVERLAP = 100.0)
 
; Print the number of crops (result is 1050)
Print, outCrops.NCROPS
 
; Remove some crop indices
outCrops.Remove, [2,4,6]
 
; Print the number of crops (result is 1047)
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 the Manage Errors topic in ENVI Help for more information on error handling.

Version History


1.0.1

Introduced

See Also


ENVIAgCrops



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