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  >  Docs Center  >  ENVI API  >  Crop Science  >  ENVIAgCropsToShapefileTask

ENVIAgCropsToShapefileTask

ENVIAgCropsToShapefileTask

This task converts an ENVIAgCrops object to a shapefile.

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

Example


This example performs the following steps:

  1. Opens an RGB image of emerging cotton plants, captured by an unmanned aerial vehicle (UAV). Image courtesy of Drone Global Network.
  2. Runs ENVIAgCropCount on the green band of the image, to count the crops and to create an ENVIAgCrops object.
  3. Creates a shapefile from the ENVIAgCrops object.
  4. Displays the shapefile on top of the image.

Note: The resulting crop count includes several outliers. You can use ENVIAgFindRowsAndRemoveOutliersTask to remove these.

; 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
countTask = ENVITask('AgCropCount')
countTask.INPUT_RASTER = subset
countTask.INCLUDE_EDGES ='true'
countTask.MINIMUM_CROP_DIAMETER = 9 ;pixels
countTask.MAXIMUM_CROP_DIAMETER = 12
countTask.NUMBER_OF_INCREMENTS= 12
countTask.GAUSSIAN_FACTOR = 0.8
countTask.PERCENT_OVERLAP = 60
countTask.INTENSITY_THRESHOLD = 0.81
countTask.Execute
outCrops = countTask.OUTPUT_CROPS
 
; Get the crops-to-shapefile task from the 
; catalog of ENVITasks
shapeTask = ENVITask('AgCropsToShapefile')
 
; Define inputs
shapeTask.INPUT_CROPS = outCrops
 
; Define outputs
shapeTask.OUTPUT_VECTOR_URI = e.GetTemporaryFilename('.shp')
 
; Run the task
shapeTask.Execute

Syntax


Result = ENVITask('AgCropsToShapefile')

Input properties (Set, Get): INPUT_CROPS, OUTPUT_VECTOR_URI

Output properties (Get only):OUTPUT_VECTOR

Properties marked as "Init" are applied only during the initial creation of the object. Properties marked as "Set" are those that you can set to specific values after the object has been created. 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. See the ENVITask topic in ENVI Help.

  • AddParameter
  • Execute
  • Parameter
  • ParameterNames
  • RemoveParameters

Properties


This task inherits the following properties from ENVITask:

COMMUTE_ON_DOWNSAMPLE

COMMUTE_ON_SUBSET

DESCRIPTION

DISPLAY_NAME

NAME

REVISION

See the ENVITask topic in ENVI Help for details.

This task also contains the following properties:

INPUT_CROPS (required)

Specify an input ENVIAgCrops object.

OUTPUT_VECTOR

This is a reference to the output vector.

OUTPUT_VECTOR_URI (optional)

Specify a string with the fully qualified path and filename for the output ENVIVector.

Version History


1.0

Introduced

See Also


ENVIAgCropsToShapefile, ENVIAgCrops, ENVIAgCropCount, ENVIAgCropCountTask



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