Hello Dr. Rawlins,
I would second the comments of Tom. In particular SAGA's cluster analysis
implements an approach similar to Definiens (previously eCognition), which
is quite popular in remote sensing. A summary can be found from their
website under References, "Image segmentation using represen
If, by 'feature extraction', the colleague refers to classifying the
raster imagery pixels into discrete categores (e.g., vegetation types),
I would suggest looking at the 'r.' and 'i.' components of GRASS GIS,
which of course integrates well with R.
Hope this helps.
Rick R
Rawlins, Barry G w
e/saga-gis/gga115_08.pdf
HTH
Tom Hengl
http://spatial-analyst.net
-Original Message-
From: r-sig-geo-boun...@stat.math.ethz.ch
[mailto:r-sig-geo-boun...@stat.math.ethz.ch] On Behalf Of
Rawlins, Barry G
Sent: Friday, February 27, 2009 3:06 PM
To: r-sig-geo@stat.math.ethz.ch
Subject: [R-s
I have a colleague who is not familiar with R and we were discussing feature
extraction from multiple images (air photos, satellite based etc.). He uses a
commercial tool for feature extraction. Can anyone point me to a package in R
that does this? I have done a search but not found such a funct
