"...NDVI images are timely available for whole continents, and it would be a waste of resources to omit any effort to draw from them all possible useful information. ADDAPIX is an attempt to obtain useful synthetic results, at least from a qualitative viewpoint and in spite of the above mentioned unreliability, by processing large amounts of NDVI data." (ADDAPIX Manual, Introduction)

Though initially aimed at the Early Warning community, and therefore developed with Cold Cloud Duration, NDVI time series and IDA/WINDISP image format in mind, ADDAPIX can easily handle any set of satellite images provided as bitmaps (RAW, BIN or BIL), and it has actually been applied so far for different purposes to a variety of images.

In its executable form this package can be freely used by anybody for any type of application. The authors' only expectation is its use to be acknowledged in publications, as it is  the custom in the scientific community.

Now a Windows 32 version is being developed, again with a partial contribution from FAO/ARTEMIS.
While waiting to complete the porting  to Win32, some updated DOS versions were released to fix some bugs and patch some compatibility problems encountered under Win NT and 2000.
 

Changes in version 2.04.01  (released June 2000)

• The Installation program aborted when installing under Win NT or 2000: fixed.
• Some annoying, though non-fatal, problems arising when the pre-defined DOS editor was called from the management routine to open a parameter file have been fixed.
• Some programs (Principal Component Analysis, non-hierarchical Classification, and several utilities) have been converted to 32 bit under the DOS4GW Dos Extender.
• Added the Albers, Goodes-Homolosine, UTM and Polar Stereographic projections.

 
Changes in version 2.04.03  (released February 2002)

• fixed some bugs in the routines  CROP, RECODE and SHOWDAT;
• the way the reconstruction/smoothing routine operates on time series was modified. This specially affects NDVI images.

If the reconstruction of missing values is requested (in PREPDATA), but  no code for missing values is defined for the concerned IDA type, the reconstruction cannot be carried out. Anyway, for de-clouding/de-misting purposes, each pixel's series is modified by filling local negative peaks caused by (even partial) cloudy or foggy conditions. This is ALWAYS done when the reconstruction or smoothing of a time series is requested.
Be warned that this operation is inappropriate when working on radiometric bands, for which reconstruction/smoothing make usually no sense. 
To see how the procedure works, run PREPDATA twice on a time series of images: first do a simple merging without reconstructing/smoothing, then another run requesting reconstructing/smoothing. You will obtain two .DAT  files that you can simultaneously visualize in DISPLAY to realize the way the procedure has operated.
The picture below shows an example: 
• the curve in red displays the observed time profile of a pixel, without any treatment.
• the curve in blue shows the profile after de-clouding and smoothing using a 3-order moving average  with equal weights.
• the curve in yellow represents the average profile of the class to which the pixel is assigned. 





Changes in version 2.05  (released September 2002)
 

• ADDAPIX uses a DOS Extender to run the most memory-demanding applications (Principal Component Analysis, non-hierarchical Clustering, some utilities) which are 32bit. The DOS Extender used so far (DOS4GW) appeared to be compatible with the base version of Win2000, but did not work any longer  when the Win2000 Service Packs were applied.

It was therefore necessary to have recourse to another DOS Extender (WDOSX by Michael Tippach), fixing some small incompatibilities existing with the ADDAPIX code. 
 
• The size of the image displayed by DISPLAY has been increased. Now up to 9408 lines and 8704 columns are accepted.

You can download separately the ADDAPIX Manual from here and the Tutorial documentation from here. They are both in ACROBAT 4.0 PDF format, and are also included in the EXE files listed above.
 

 
self-extracting, creates a tree of folders,  storing the files for a brief ADDAPIX tutorial.

 
describes how to install and run the Tutorial.