[GRASS-user] multi-date image segmentation in grass

[maning sambale]

Hi,

I have several Landsat (4-7) images from 1990-2002  which will be used
for change analysis of land cover.  FAO's FRA-RSS [1] developed a
standard methodology for integrating multi-temporal Landsat into a
consistent sample tiles. The article [2] outlined the general method
as:
 - Image subsetting
 - Radiometric normalization
 - Contrast enhancement
 - Multi-date image segmentation

Most of the processing procedures I was able to do in GRASS GIS,
except for the last step.  The process combined the multi-date imagery
where an automated image segmentation was implemented to derive
preliminary polygons to identify changes.  I believe they used
ecognition for the segmentation.  I've used i.smap for preliminary
segmentation on separate dates but not for a combined multi-date
imagery.  Anyone tried this with GRASS? Can i.pca do this or another
tool?

Any idea

[1] http://www.fao.org/forestry/fra/remotesensingsurvey/en/
[2] http://www.informaworld.com/smpp/content~content=a923063789~db=all~jumptype=rss

-- 
cheers,
maning
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