AgFindAndRasterizeCropGaps Task

This task finds missing crops within each row of an associated ENVIAgCrops object.

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

Example

This example performs the following steps:

Opens an RGB image of emerging cotton plants, captured by an unmanned aerial vehicle (UAV). Image courtesy of Drone Global Network.
Runs AgCropCount Task on the green band of the image, to count the crops and to create an ENVIAgCrops object.
Runs AgFindRowsAndRemoveOutliers Task.
Runs AgFindAndRasterizeCropGaps Task.
Displays the original crops raster in cyan and the missing crops in red.

; Start the application

e = ENVI()

; 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

; Find rows and remove outliers

rowTask = ENVITask('AgFindRowsAndRemoveOutliers')

rowTask.INPUT_CROPS = countTask.OUTPUT_CROPS

rowTask.DISTANCE_THRESHOLD = 14.5 ;pixels

rowTask.INLIER_FRACTION = 0.7

rowTask.MINIMUM_CROPS_PER_ROW = 25

rowtask.MAXIMUM_SLOPE = 2.0

rowTask.FILLED = 'true'

rowTask.Execute

; Find crop gaps

gapsTask = ENVITask('AgFindAndRasterizeCropGaps')

gapsTask.INPUT_CROPS = rowTask.OUTPUT_CROPS

gapsTask.FILLED = 'true'

gapsTask.Execute

; Display the result

View = e.GetView()

Layer1 = View.CreateLayer(subset)

Layer2 = View.CreateLayer(rowTask.OUTPUT_RASTER)

Layer3 = View.CreateLayer(gapsTask.OUTPUT_RASTER)

View.Zoom, /FULL_EXTENT

Syntax

Result = ENVITask('AgFindAndRasterizeCropGaps')

Input parameters (Set, Get): FILLED, INPUT_CROPS, OUTPUT_CROPS_URI, OUTPUT_RASTER_URI, SEARCH_AREA_SENSITIVITY

Output parameters (Get only): OUTPUT_CROPS, OUTPUT_NCROPS, OUTPUT_RASTER

Parameters marked as "Set" are those that you can set to specific values. You can also retrieve their current values any time. Parameters marked as "Get" are those whose values you can retrieve but not set.

Input Parameters

FILLED (optional)

Set this parameter to true to create filled circles in the output crops classification raster. The default is false.

INPUT_CROPS (required)

Specify an input ENVIAgCrops object.

SEARCH_AREA_SENSITIVITY (optional)

Enter a search area sensitivity value. The default value is 0. Increasing the value in the positive direction will increase the sensitivity of the gap-finding process, which means it will fit more crops into a gap. Decreasing the value in the negative direction will decrease the sensitivity of the gap-finding process, resulting in fewer crops in a gap. A good starting point is 0, then slowly increase the value (1, 2, 3, etc.) until the desired number of crops fill the gaps.

OUTPUT_CROPS_URI (optional)

Specify a string with the fully qualified filename and path for the output JSON file that will contain the crop data.

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 parameter, or set it to an exclamation symbol (!), ENVI creates a temporary file.
If you set it to the hash symbol (#), ENVI creates a file in the temporary directory, but this file will not be deleted when ENVI closes.