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Subject: RE: some questions on landscape indices and artifical landscapes
From: Damien (damien.bouquier@laposte.net)
Date: Fri Jan 28 2005 - 09:57:10 CET
Hello Paolo,
I can only answer regarding to CORMAS plateform. When I read you question 1
think of this publication written by Michel Etienne :
Etienne, M. "SYLVOPAST: a multiple target role-playing game to assess
negotiation processes in sylvopastoral management planning." Jasss-the
Journal of Artificial Societies and Social Simulation 6.2 (2003).
It's available on the Cormas' website :
http://cormas.cirad.fr/fr/bibliog/article.htm
It deals with the evolution of a landscape under different pastoral and
forest managements. The point is that is it use "the ratio between the
different vegetation types of the forest corresponds to the average state of
a littoral French Mediterranean forest but the location of the cells on the
grid was calculated in such a way as to stimulate reactions by the players"
(take a look at the "Game calibration" part).
Regarding to your questions 3) He uses "realistic data for environmental
parameters" but not a real map. It's useful because when people are real
stakeholders they are not able to recognize there own property (which could
leads to a bias in behaviour).
4) with different kind of aggregate and different points of view (povs) it
should be possible.
5) I'm not sure since the quality of a scaling seems to depend mostly on the
data's highest resolution. And When you zoom out you have to take care of
your aggregation method. There is an interesting discussion about that in
"Special disaggregation of agricultural production data using maximum
entropy" this article deal with economy but the discussion about importance
of the scale is really interesting (I can join you a pdf).
In order to scale down, i would pay attention to avoid border effects. For
example I would define some indicators that should be independent form the
size of your simulation and look when they began to change according to the
surface. For example in the life game at the end their should be the same
percent of cells occupied even if the surface size is 50*50 or 1000*1000 but
is the surface is 5*5 the result will be different (border effects) and the
resize would be too strong.
Cheers,
Damien
-----Message d'origine-----
De : owner-cormas@cirad.cirad.fr [mailto:owner-cormas@cirad.cirad.fr] De la
part de Paolo Campo
Envoyé : vendredi 28 janvier 2005 02:34
À : CORMAS
Objet : some questions on landscape indices and artifical landscapes
Hello Cormas group!
I would like to ask if there have been studies regarding creating an
artificial landscape using
values of landscape indices derived from a real landscape?
Related to above-mentioned question are more questions:
1) Under what conditions is it possible to create an artificial landscape
from a derived set of
indices?
2) How many indices were used to create the artificial landscape, what were
they (indices) and how
were they chosen?
3) Is there any merit or advantage in doing this as compared to just
creating an artificial
landscape by qualitative means?
4) Is possible to create an artificial landscape that is multi-dimensional,
i.e. creating an
artificial landscape using several layers of information?
5) Is it possible to use this method to scale up/down the landscape in terms
of area?
6) Is there a software or program that could do this automatically?
The plan is to use a representative model of the study site but with a
smaller area for the
environment. This also means that we are going to scale down the MAS model
in terms of the number
of entities and the interactions. We were thinking that if we are going to
apply spatial analyses
on the representative model, it would still be applicable to the real
landscape, and this method
would provide a numerical or statistical basis for the applicability of the
analyses to the real
landscape.
Any reference that you could recommend that would answer any of these
questions, especially the
first one, will be very much appreciated.
Thank you in advance.
Cheers,
Paolo
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