DiceRasterByVector Task

This task separates a raster into tiles based on the spatial extent of individual vector records. The number of resulting tiles will be equal to the number of separate vector records.

Example

; Start the application

e = ENVI()

; Open an input raster file

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

Root_Dir=e.Root_Dir)

Raster = e.OpenRaster(File)

; Open an input vector file

File = Filepath('qb_boulder_msi_vectors.shp', Subdir=['data'], $

Root_Dir=e.Root_Dir)

Vector = e.OpenVector(File)

; Get the task from the catalog of ENVITasks

Task = ENVITask('DiceRasterByVector')

; Define inputs

Task.INPUT_RASTER = Raster

Task.INPUT_VECTOR = Vector

; Define output location

Task.OUTPUT_DIRECTORY = Filepath('', /TMP)

; 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 results

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('DiceRasterByVector')

Input parameters (Set, Get): INPUT_RASTER, INPUT_VECTOR, OUTPUT_DIRECTORY

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.

Input Parameters

INPUT_RASTER (required)

Specify the input raster.

INPUT_VECTOR (required)

Specify the input vector shapefile that will be used to tile the input raster.

OUTPUT_DIRECTORY (optional)

Specify the output directory for the tiles. If set to an asterisk (*), the output rasters will be virtual. This will not be written to disk, and the directory will not be created. If you do not set this parameter, the tiles will save to the directory indicated by the ENVI Output Directory preference.

Output Parameters

OUTPUT_RASTER

This parameter contains an array of output rasters. Their filenames contain the root name of the input raster with "Areaxx" appended, where xx is the vector record number.