DiceRasterBySubrects Task

This task creates an array of rasters based on subrects. A subrect is a bounding box used to spatially subset a raster. It is part of a sequence for dicing rasters:

Consider using one of the following to perform these steps in one task:

Example

; Start the application

e = ENVI()

; Open an input file

File = Filepath('qb_boulder_msi', Subdir=['data'], $

  Root_Dir=e.Root_Dir)

Raster = e.OpenRaster(File)

; Create some subrects

SubrectTask = ENVITask('CreateSubrectsFromTileCount')

; Define inputs

SubrectTask.NUMBER_OF_X_TILES = 3

SubrectTask.NUMBER_OF_Y_TILES = 4

SubrectTask.NCOLUMNS = Raster.NCOLUMNS

SubrectTask.NROWS = Raster.NROWS

; Run the task

SubrectTask.Execute

; Get the resulting subrects

Subrects = SubrectTask.SUBRECTS

; Get a list of names that will be used to denote the subrect areas

SubNames = SubrectTask.SUBRECT_NAMES

; Get the primary task from the catalog of ENVITasks

Task = ENVITask('DiceRasterBySubrects')

; Define inputs

Task.INPUT_RASTER = Raster

Task.SUBRECT_ARRAY = Subrects

Task.SUBRECT_NAMES = SubNames

; Run the task

Task.Execute

; Get the data collection

DataColl = e.Data

; Add the output to the data collection

DataColl.Add, Task.Output_Raster

; Display the result

View1 = e.GetView()

for i=0,N_Elements(Task.Output_Raster)-1 do $

  Layer = View1.CreateLayer(Task.Output_Raster[i])

View1.Zoom, /FULL_EXTENT

Syntax

Result = ENVITask('DiceRasterBySubrects')

Input parameters (Set, Get): INPUT_RASTER, SUBRECT_ARRAY, SUBRECT_NAMES

Output parameters (Get only): 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.