Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/5275
Título: Relatório integrador da actividade profissional. Os sistemas de informação geográfica (SIG) no controlo de superfícies agrícolas em Portugal Continental
Autor: Carmona, Vitor Manuel Pereira
Orientador: Campagnolo, Manuel Lameiras Figueiredo
Palavras-chave: GIS
remote sensing
multispectral imagery
aerial photography
surface control
agriculture subsidies
Data: 2012
Editora: ISA/UTL
Citação: Carmona, V.M.P. - Relatório integrador da actividade profissional. Os sistemas de informação geográfica (SIG) no controlo de superfícies agrícolas em Portugal continental. Lisboa: ISA, 2012, 92 p., Anexos
Resumo: The present dissertation is based on my experience of more than a decade of work on field control in agriculture. The goal of this dissertation is to explain what control of agricultural areas (from now on called “surface control”) is, why is this task necessary in the context of agricultural subsidies and what is the relevance of Geographic Information Systems (GIS) and Remote Sensing (RS) in this process. European Union’s Common Agricultural Policy for agricultural subsidies requires for Portugal the verification of between 220000 and 250000 parcels a year in less than five months. This work addresses some of the issues that that have to be dealt when dealing with those heavy requirements. On this first part of the work I discuss what is the Portuguese National Paying Agency (IFAP, IP), its mode of operation, and the role of the different agents in the process of surface control. I also describe the major aspects of the software that is used at IFAP to support agriculture survey and subsidy claims. The following part of the work is dedicated to GIS and RS because of their importance in surface control. I briefly discuss the fundamentals of both technologies in the context of their use by IFAP. In this sense I mention the vector and raster component of GIS and their role in representing the relevant information for surface agriculture survey and surface control. Aerial images are too a fundamental component of the control framework. In addition, IFAP uses multispectral imagery from three different satellites for remote sensing of agricultural areas: IRS, Landsat and SPOT. In the dissertation, the main characteristics of those images and their relevance for the problem at hand are discussed. Satellite imagery has been incorporated in the control process essentially by means of temporal sequences of color composites from the different sensors. For this approach to be successful, it is necessary to have a dense sequence of composites over the growing cycle of the cultures under analysis. This explains why more than one sensor is used. Even though sensors have different specifications, false color composites which combine near infrared and visible reflectance are comparable.An important part of my work in surface control has been linked to the development of photointerpretation keys based on temporal series of color composites of remote sensing imagery for a range of cultures that have been eligible for agriculture subsidies. The dissertation describes how useful those keys can be in verifying the claims of the “farmers” who request agricultural subsidies, i.e. how they can help the surface control. One of the conclusions is that they are of very limited use in northern Portugal where small parcels are common. Nevertheless, they can be very useful for the control of large parcels, mainly in central and southern Portuguese mainland. The size of agriculture areas (parcels) and new environmental criteria for EU subsidies limits to wide use of RS in all the Portuguese territory. That’s why other methods of control are needed to accomplish this task. However, given the very strict time requirements of the process, RS has still a major role in ensuring that results can be timely obtained. The last part of the dissertation sums up the different chapters and discusses the advantages and disadvantages of using GIS and RS in surface control. It also includes suggestions, based in my professional experience, towards improving the surface control process. In short, the main idea I want to transmit is that without GIS, surface control is almost an impossible task, and RS is an important tool, despite the limitations that prevent its broader use.
Descrição: Relatório Integrador da Actividade Profissional - Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/5275
Aparece nas colecções:BISA - Relatórios Integradores da Atividade Profissional

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