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  >  Docs Center  >  ENVI API  >  Processing  >  ENVIRegridRasterSeriesByUnion

ENVIRegridRasterSeriesByUnion

ENVIRegridRasterSeriesByUnionTask

This task regrids a series of rasters to a common spatial grid, using the geometric union of the source rasters. All of the source rasters must be in the same coordinate system. The pixel size of the output series is determined by the first raster in the series.

Example


This example builds a raster series from a collection of Landsat MSS, TM, and -8 images. They are all georeferenced to the same coordinate system, but their sizes and resolution are different. The example uses the geometric union of the source rasters as the basis for reprojecting the other rasters in the series.

The example uses sample images from the ENVI Resource DVD (in the LandsatCaseStudies\TimeSeries folder). The images are also available from the ENVI Tutorials web page. Click the "ENVI Tutorial Data" hyperlink. Copy the images to your local drive, and update the file location with your own directory.

; Start the application
e = ENVI()
 
; Select input rasters
Files = FILE_SEARCH('C:\Data', 'LasVegas*.dat')
 
; Get the build raster series task from the catalog of ENVITasks
Task = ENVITask('BuildRasterSeries')
numRasters = N_Elements(Files)
rasters = ObjArr(numRasters)
FOR i=0, (numRasters-1) DO $
  rasters[i] = e.OpenRaster(Files[i])
 
; Define inputs
Task.INPUT_RASTERS = rasters
 
; Define outputs
Task.OUTPUT_RASTERSERIES_URI = e.GetTemporaryFilename('series')
 
; Run the task
Task.Execute
Series = Task.OUTPUT_RASTERSERIES
 
; Get the task from the catalog of ENVITasks
RegridTask = ENVITask('RegridRasterSeriesByUnion')
 
; Define inputs
RegridTask.INPUT_RASTERSERIES = Series
 
; Define outputs
RegridTask.OUTPUT_RASTERSERIES_URI = e.GetTemporaryFilename('series')
 
; Run the task
RegridTask.Execute
 
; Get the collection of data objects currently available in the Data Manager
DataColl = e.Data
 
; Add the output to the Data Manager
DataColl.Add, RegridTask.OUTPUT_RASTERSERIES
 
; Display the result
View = e.GetView()
Layer = View.CreateLayer(RegridTask.OUTPUT_RASTERSERIES)

Syntax


Result = ENVITask('RegridRasterSeriesByUnion')

Input properties (Set, Get): INPUT_RASTERSERIES, OUTPUT_RASTERSERIES_URI, RESAMPLING

Output properties (Get only): OUTPUT_RASTERSERIES

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:

AddParameter

Execute

Parameter

ParameterNames

RemoveParameter

Properties


This task inherits the following properties from ENVITask:

COMMUTE_ON_DOWNSAMPLE

COMMUTE_ON_SUBSET

DESCRIPTION

DISPLAY_NAME

NAME

REVISION

TAGS

This task also contains the following properties:

INPUT_RASTERSERIES (required)

Specify a raster series to reproject.

OUTPUT_RASTERSERIES

This is a reference to the output raster series.

OUTPUT_RASTERSERIES_URI (optional)

Specify a string with the fully-qualified path and filename for OUTPUT_RASTERSERIES.

RESAMPLING (optional)

Specify the resampling method.

  • Nearest Neighbor: Uses the nearest pixel without any interpolation.
  • Bilinear (default): Performs a linear interpolation using four pixels to resample.
  • Cubic Convolution: Uses 16 pixels to approximate the sinc function using cubic polynomials to resample the image.

Version History


ENVI 5.2

Introduced

ENVI 5.5 Replaced INPUT_RASTERSERIES_URI with INPUT_RASTERSERIES

API Version


3.2

See Also


ENVITask, ENVITask::Parameter, ENVIGridDefinition, ENVIRegridRasterSeries, ENVIRegridRasterSeriesByIndex, ENVIRegridRasterSeriesByIntersection, ENVIRegridRasterSeriesByUnion, ENVIBuildRasterSeriesTask, ENVIBuildTimeSeriesTask, ENVIRasterSeries, ENVIRasterSeriesLayer



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