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A desagregação espacial de dados agrícolas: aplicação de uma abordagem baseada na máxima entropia ao concelho de Castelo de Vide
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Authors
Abstract(s)
The purpose of this dissertation is to complement the lack of data related to the forest and
agricultural occupation and the livestocks in Castelo de Vide. To solve the research problem a
model of data disaggregation was developed, taking the utmost of previous information available
in earlier studies.
The proposed model was based on the ideas of generalized maximum entropy (GME) and
minimum generalized crossed entropy (MGCE), in order to obtain a series of disaggregated data
related to the forest and agricultural occupation, considering two levels of disaggregation and
following two steps: 1) the creation of a basis at the aggregated level (Markov transition
matrixes, estimated by the maximum entropy); 2) data disaggregation, based on the previous
established basis. The model also involves two application variants: simultaneous disaggregation
of data as well as a direct one (to solve the problems that might appear in the previous one and
maximize the recovered information). Moreover, a model based on these principles is proposed to
the disaggregation of the livestock data.
The model is applied to the disaggregation of data in the municipality of Castelo de Vide.
The results obtained in the process of direct disaggregation of the forest and agricultural
occupation and livestock have shown to be reliable. They have been validated in the year of 1999,
submitted to experts? opinions, to other sources of information and compared to the results of
other methodologies.
The analysis of the results showed that the forest and agricultural occupation of Alto
Alentejo and Castelo de Vide after 1999 tend to be more homogeneous, with a strong domain of
permanent pastures, and there is a shortage of certain livestocks (sheep and goats). The several
CAP changes have had effects in Alto Alentejo and Castelo de Vide, since they have contributed to
a larger extensification of the practice of agriculture and to the decline of traditional productions.
Description
Dissertação mest., Gestão Sustentável de Espaços Rurais, Universidade do Algarve, 2009
Keywords
Teses Ocupação agro-florestal Modelo de desagregação de dados Pecuária Agricultura Dieta mediterrânica