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الاثنين، 5 مارس 2018

Álgebra de mapas e suas aplicações em sensoriamento remoto e geoprocessamento ...


Álgebra de mapas e suas aplicações em sensoriamento remoto e geoprocessamento


MAP ALGEBRA AND ITS APPLICATION 
IN REMOTE SENSING GEOPRCESSING


Claudio Clemente Faria Barbosa



Resumo

  O termo "Álgebra de Mapas" é utilizado na literatura de Geoprocessamento e Sensoriamento Remoto para denotar o conjunto de operadores que manipulam campos geográficos (imagens, mapas temáticos e modelos numéricos de terreno). Este trabalho discute as diferentes questões envolvidas na concepção, implementação e uso dos operadores da Álgebra de Mapas. Na análise conceitual, o trabalho apresenta uma visão teórica consistente do problema, ao analisar a definição destes operadores e ao indicar as alternativas de conversão de formatos necessárias para implementar cada operador. A implementação dos operadores foi realizada no ambiente da linguagem de comandos do sistema SPRING (LEGAL). Para testar e validar os operadores implementados, tomou-se uma aplicação prática, de grande importância (Zoneamento Ecológico-Econômico da Amazônia Legal). A partir de um roteiro metodológico, que objetiva estimar o grau de estabilidade de unidades homogêneas de paisagem, foi desenvolvida uma aplicação em LEGAL, a qual automatiza algumas etapas do roteiro utilizando os operadores implementados neste trabalho. A grande coerência entre os resultados obtidos por essa técnica e os produzidos anteriormente (com uso de interpretação visual) revelou o potencial da Álgebra de Mapas como ferramenta de apoio a estudos de Sensoriamento Remoto e Geoprocessamento.

MAP ALGEBRA AND ITS APPLICATION 

IN REMOTE SENSING GEOPRCESSING

ABSTRACT  

  The term "Map Algebra" is used in the Geoprocessing and Remote Sensing literature to denote the set of operators that handle geographic fields (images, thematic maps and numerical terrain models). This work analyzes the different questions involved in the conception, implementation and use of the operators from Map Agebra. In the conceptual analysis, this work presents a consistent theoretical vision of the problem, by analyzing the definition of these operators and by indicating the alternatives of format conversion that are required to implement each operator. The operators were implemented under the environment of the command language of the SPRING system (LEGAL). To test and validate the implemented operators, aconcrete, important application was considered (Ecological and Economical Zoning of Legal Amazon). Starting with a methodological plan, which aims to estimate the degree of stability of homogeneous units of scenery, an application in LEGAL was developed to automate such plan, using the operators developed in this work. The great coherency between the results achieved by this technique and those previously produced (with the use of visual interpretation) has shown the potential of Map Algebra as a supporting tool for studies in Remote Sensing and Geoprocessing 








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