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ACKNOWLEDGEMENTS 
The authors are grateful to the Associacdo dos Municipios 
Bairrada Vouga for lending the 20 positives used, and to the 
Enterprise Artop for having scanned them. 
The authors are also grateful to the following students of the 
Geo-Information course: Hélder Santos, Silvia Cambra, Silvia 
Soares and Rubens Junior for providing Figures 2 to 6 of this 
paper. 
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