urbanized areas are restored) is feasible, at least in de-
veloped country, where the population is stabilizing
around constant values. But it is very important to
control both the transient evolution, between the cur-
rent almost unrestricted situation and the zero-balance
regime, and the transient duration, to allow the adap-
tation to the new paradigm for the current social and
economic model, which is instead strongly dependent
on the land transformability.
In this paper we propose a land uptake control pro-
cedure, that involves the main actors (municipalities,
regional authorities), at different level of responsibil-
ity. This control procedure could be implemented by
defining appropriate normative tools, by establishing
technical staffs with the task of system monitoring
and of data base maintaining, and by establishing an
efficient information management infrastructure.
The main idea is that of introducing the output-
feedback paradigm in the environmental planning
process. While closed loop control is a standard tool
in most technological disciplines, it is not so in social
management systems, in general. This is mainly due
to the complexity of the systems, whose behavior is
in most case unpredictable with sufficient accuracy,
to the difficult in obtaining data and sometimes to the
cultural inadequacy of the system managers (politi-
cians, administrative and technical staff). In fact the
seminal book (McLoughlin, 1969) remains an im-
portant reference for a system approach to the urban
and environmental planning, but, at the best of our
knowledge, this conceptual formulation of the prob-
lem has not so far produced an effective information
system, for a dynamic plan management. Nowadays
the things are dramatically changing: the availability
and penetration in the public administration of Ge-
ographical Information Systems (GIS), the availabil-
ity of remote sensing techniques and powerful hard-
ware and communication infrastructures (WEB), to-
gether with advances in systems and control theory
make innovative procedures feasible ((Sharma et al.,
2012),(Thompson and Prokopy, 2009)). Anyway the
complexity of the systems remains unchanged, and
hence a possible approach is that of splitting the over-
all system into different interacting sub-systems, each
characterized by simple models. The level of abstrac-
tion of each model has to be obviously appropriate for
the problem to be solved.
In the system we are considering humans are in
loop, and the social behavior has not been modeled.
Therefore the resulting control system is not auto-
matic, but it can offer an important formal frame-
work to support the decision process. This control
scheme could be integrated in an environmental De-
cision Support System (eDSS) together with all the
monitoring, management and communication tools.
The goal of the procedure we propose is twofold:
minimization of the total amount of land uptake,
while assuring the per capita standard of urbanized
areas, and maximization of the aggregation of these
areas. In fact the urban sprawl is another phenomenon
to be controlled, in order to mitigate the above defined
aspects, with a particular attention to diseconomies in
transport and waste of energy. See (Glaeser, 2011),
for a vibrant discussion on the advantage of a dense
city, with respect to energy consumptions, sharing of
amenities and so on, even at popular level.
Instead of giving hard constraints on the land
uptake amount, our proposal is based on a reward-
penalty approach, by giving a monetary value to the
untransformed land. In this way each municipality
has flexibility in planning the environmental trans-
formations, but has also the awareness that the deci-
sions have to be the result of an optimization prob-
lem, where the land uptake has its cost. We think that
the flexibility and the graduality are the keys to allow
the practical implementation of environmental control
policies, and to reduce possible social conflicts.
The idea of planning the future developments, step
by step, on the base of actual measured data, but in the
framework of given objectives, could cause a change
of perspective in urban planning itself, as it is tradi-
tionally considered, at least in those countries (e.g.
Italy) where a process control on the current plan is
not actuated, after the approval procedures. We do
not dwell here on this question, but a parallel analysis
is in progress.
The paper is organized as follows: the land uptake
problem is defined in Section 2. In Section 3, three
possible control schemes are introduced. Section 4
considers the sprawl control problem. In Section 5 a
discussion is offered, with possible extensions of the
approach.
2 LAND UPTAKE
The issue of excessive urban conversion of natural
land has been raised at European level only in recent
years, mainly through the initiatives undertaken by
the European Environmental Agency (EEA, 2006) to
analyze this phenomenon and its consequences. See
Fig.1 and Fig 2, for some revealing data. See also (Pi-
leri and Maggi, 2010) and (Romano and Zullo, 2013a)
for analysis of urbanization in Italy.
Furthermore, it is worth recalling that the Euro-
pean Commission, based on a need to tackle soil
productivity, risks to human health and the environ-
ment, and to provide opportunities for climate mit-
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