The ClearThresholds method removes all the threshold definitions from an ROI.


; Launch the application
e = ENVI()
; Open the input file
file = Filepath('qb_boulder_msi', ROOT_DIR=e.Root_Dir, $
raster = e.OpenRaster(file)
view = e.GetView()
layer = view.CreateLayer(raster)
; Define a new ROI with a threshold and display it
roi = EnviRoi(NAME='Threshold', COLOR='Blue')
roi.AddThreshold, raster, 3, MIN_VALUE=0, MAX_VALUE=175
roiLayer = layer.AddRoi(roi)
; Clear the thresholds for this region


ENVIROI.ClearThresholds [, ERROR=variable]



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

ENVI 5.1


API Version


See Also

ENVIROI, ENVIRaster, ENVIROI::AddThreshold