Wednesday, 27 August 2008

Wseas Transactions

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Transactions: WSEAS TRANSACTIONS ON ENVIRONMENT AND DEVELOPMENT
Transactions ID Number: 27-697
Full Name: M. Belém Martins
Position: Assistant Professor
Age: ON
Sex: Female
Address: Faculdade de Engenharia dos Recursos Naturais, Universidade do Algarve, Campus de Gambelas, 8005-139 FARO
Country: PORTUGAL
Tel: 289 800 957
Tel prefix: 00 351
Fax: 289 818 419
E-mail address: mbmartins@ualg.pt
Other E-mails: mrlucas@uevora.pt, rfragoso@uevora.pt
Title of the Paper: Generate disaggregated soil allocation data using a Minimum Cross Entropy Model
Authors as they appear in the Paper: Rui Fragoso, Maria de Belém Martins, Maria Raquel Ventura-Lucas
Email addresses of all the authors: rfragoso@uevora.pt, mbmartins@ualg.pt, mrlucas@uevora.pt
Number of paper pages: 11
Abstract: Montado ecosystem in the Alentejo Region, south of Portugal, has enormous agro-ecological and economics heterogeneities. A definition of homogeneous sub-units among this heterogeneous ecosystem was made, but for them is disposal only partial statistical information about soil allocation agro-forestry activities. The paper proposal is to recover the unknown soil allocation at each homogeneous sub-unit, disaggregating a complete data set for the Montado ecosystem area using incomplete information at sub-units level. The methodological framework is based on a Generalized Maximum Entropy approach, which is developed in thee steps concerning the specification of a r order Markov process, the estimates of aggregate transition probabilities and the disaggregation data to recover the unknown soil allocation at each homogeneous sub-units. The results quality is evaluated using the predicted absolute deviation (PAD) and the "Disagegation Information Gain" (DIG) and shows ver!
y acceptable estimation errors.
Keywords: Montado ecosystem, Cross Entropy, Maximum Entropy, Incomplete information, Alentejo
EXTENSION of the file: .doc
Special (Invited) Session: A Minimum Cross Entropy Model to generate informationat disaggregated level
Organizer of the Session: 588-322
How Did you learn about congress: Professor Raul Jorge - rjorge@isa.utl.pt
IP ADDRESS: 193.136.225.22