This upgrade provides significant enhancements to quality and speed of Aster DTM extraction. Below a summary of the most important changes:

- improved DTM extraction pyramid for enhanced stability, less outliers and improved DTM resolution (< 10 m STD90);
- significant speed enhancements, specially for high resolution (15 m ) mode;
- much improved memory usage, specially for mosaic mode;
- full external DEM support for batch mode.

Version 2.2

• new batch file setup window ("File->Batch File Setup"):

This new facility provides a graphical interface for setting up the batch processing of
any number of ASTER 1A and 1B images. ASTER images can be imported individually,
or directories or even entire logical drives can be browsed for valid images, and
processed according to a set of interactively defined parameters. Other than the already
existing ASTERDTM_DOIT batch routine, the interactive batch setup does not need a
valid IDL license and works within ENVI (RT) as well as within ENVI+IDL.

• new mosaic setup window ("File->Mosaic Setup"):

  This new option enables mosaicing of Aster 1A and 1B images, through an easy-to-use
  graphical interface. Browse for valid Aster images, interactively define the desired
  processing options, and produce seemless mosaics with a few mouse clicks.

• implementation of the ASTER lat/lon correction table:

  In the Aster User's Guide Part II (ver 4), ERSDAC published a set of polinomial
  coefficients to improve the geolocation accuracy for level-1 products prior to
  geometric DB version 2.2; this correction is now being applied automatically
  (daytime products only).

• 1A->1B conversion (SWIR):

  Improved algorithm for choosing internal control points.
  Band 4 matched to band 3N, all other SWIR bands are now
  matched to the geocorrected band 4.
  
  In case the number of found valid internal matching points is less
  then expected, an output result is still produced and a warning is
  issued (before the process would be aborted instead).
  
  Fixed a bug which would inhibit saving the result to file.

   

• 1A->1B conversion (TIR):

  Same enhancements as for SWIR for geocorrection through image matching.
  
  Additional alternative option for using the ephemeris data to geocorrect TIR bands.

   

• General enhancements:

Greatly reduced DEM striping/banding (actually a kind of aliasing effect) which
would eventually occur for very flat terrain in 1A images.

Fixed a bug which eventually would cause AsterDTM to crash when using an
external DEM.

• Functional Enhancements

  New option for using Ground Control Points;

  
  New ASTER 1A SWIR and TIR orthocorrection option;

  
  New option for calibrating ASTER 1B images

  New automatic detection of water bodies:

   

• New Processing Options

       
       New option for output files to be north oriented;

  
       New option for selecting the correlation kernel size;

  
       New option for extended correlation analysis;

  
       New option for selecting the correlation matrix interpolation.

• Greatly enhanced support for external DEMs

• Improved performance and enhanced vertical resolution
  
  
  
• Enhanced batch capabilities
  
  
  
• New shortcut menu

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