RasterMetadataItem Task

This task retrieves the value of a given raster metadata key.

Example

; Launch the application

e = ENVI(/HEADLESS)

; Create an ENVIRaster

File = FILEPATH('qb_boulder_msi', ROOT_DIR=e.ROOT_DIR, $

  SUBDIRECTORY = ['data'])

Raster = e.OpenRaster(File)

; Get the task from the catalog of ENVITasks

Task = ENVITask('RasterMetadataItem')

; Define inputs

Task.INPUT_RASTER = Raster

Task.KEY = 'wavelength'

; Run the task

Task.Execute

; Print its value

PRINT, Task.VALUE.VALUE

IDL prints:

485.00000       560.00000       660.00000       830.00000

Syntax

Result = ENVITask('RasterMetadataItem')

Input properties (Set, Get): INPUT_RASTER, KEY

Output properties (Get only): VALUE

Properties marked as "Set" are those that you can set to specific values. 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:

Properties

This task inherits the following properties from ENVITask:

COMMUTE_ON_DOWNSAMPLE

INPUT_RASTER (required)

Specify an raster to retrieve a metadata item from.

KEY (required)

Specify the string key of the metadata to retrieve. See The ENVI Header Format for a list of standard metadata tags in ENVI-format rasters.

VALUE

The value of the specified metadata key.

Version History

ENVI 5.3

Introduced

API Version

4.3