Just a little bit of self-advertising..
Grohmann, C.H., Riccomini,C., 2009 (IN PRESS). Comparison of
roving-window and search-window techniques for characterising
landscape morphometry.
Computers & Geosciences.
http://dx.doi.org/10.1016/j.cageo.2008.12.014
PDF (uncorrected proof) :
http://www.igc.usp.br/pessoais/guano/downloads/Grohmann_Riccomini_2009_CAGEO_uncorrected_proof.pdf
Carlos
--
Carlos Henrique Grohmann - Geologist D.Sc.
a.k.a. Guano - Linux User #89721
ResearcherID: A-9030-2008
carlos dot grohmann at gmail dot com
http://www.igc.usp.br/pessoais/guano/
_________________
"Good morning, doctors. I have taken the liberty of removing Windows
95 from my hard drive."
--The winning entry in a "What were HAL's first words" contest judged
by 2001: A SPACE ODYSSEY creator Arthur C. Clarke
Can’t stop the signal.
2009/5/20 Carlos "Guâno" Grohmann <carlos.grohmann@gmail.com>:
Just a little bit of self-advertising..
Grohmann, C.H., Riccomini,C., 2009 (IN PRESS). Comparison of
roving-window and search-window techniques for characterising
landscape morphometry.
Computers & Geosciences.
http://dx.doi.org/10.1016/j.cageo.2008.12.014
PDF (uncorrected proof) :
http://www.igc.usp.br/pessoais/guano/downloads/Grohmann_Riccomini_2009_CAGEO_uncorrected_proof.pdf
Very nice.
While we are at it, we never advertised this great book 
T. Hengl and H.I. Reuter (eds), 2009: Geomorphometry:
Concepts, software, applications. Elsevier. 796 pages
http://www.geomorphometry.org/book.asp
http://www.elsevierdirect.com/product.jsp?isbn=9780123743459
Very interesting, because it contains a competition of
10 software packages on the same data set (which you can
download from the web site). Also much theory behind
geomorphometry is explained.
Certainly GRASS is included:
J. Hofierka, H. Mitasova, and M. Neteler, 2009: Terrain parameterization
in GRASS. In T. Hengl and H.I. Reuter, editors, Geomorphometry:
Concepts, software, applications. Elsevier (doi:10.1016/S0166-2481(08)00017-2).
Cheers
Markus