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ENVIMosaicRaster::SaveSeamPolygons

ENVIMosaicRaster::SaveSeamPolygons

The SaveSeamPolygons method saves the effective mosaic polygons (also called seam polygons) to a shapefile. It only applies if the SEAMLINE_METHOD property is set to Geometry.

Example


This example automatically generates seamlines for the input scenes that you specify, then saves the seam polygons to a shapefile. When prompted, select the input scenes of your choice.

The example uses sample images from the ENVI Resource DVD (in the mosaic 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.

PRO ENVIMosaicRaster_SaveSeamPolygonsExample
  COMPILE_OPT IDL2
   
  ; Start the application
  e = ENVI(/HEADLESS)
   
  ; Select input scenes
  files = REVERSE(FILE_SEARCH('C:\MyData\', 'airphoto*.dat'))
  scenes = !NULL
  FOR i=0, N_ELEMENTS(files)-1 DO BEGIN
     raster = e.OpenRaster(files[i], DATA_IGNORE_VALUE=0)
     scenes = [scenes, raster]
  ENDFOR
   
  ; Create a mosaic raster
  mosaic = ENVIMosaicRaster(scenes, SEAMLINE_METHOD='Geometry')
   
  ; Auto-generate geometry-based seamlines
  ; and save seam polygons to a shapefile.
  outFile = e.GetTemporaryFilename('shp')
  mosaic.SaveSeamPolygons, outFile
END

Syntax


ENVIMosaicRaster.SaveSeamPolygons, URI

Arguments


URI

A scalar string that is a fully-qualified file path to a shapefile to which the seam polygons should be written.

Keywords


ERROR

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

Introduced

API Version


3.3

See Also


ENVIMosaicRaster



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