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Investigação Operacional

versão impressa ISSN 0874-5161

Inv. Op. v.24 n.1 Lisboa jun. 2004

 

Análise factorial aplicada a métricas da paisagem definidas em FRAGSTATS

Paula Couto *

  * Grupo de Análise de Sistemas Ambientais (GASA) - Universidade Nova de Lisboa

mpaula@mail.eunet.pt

 

 

Title: Factorial Analysis applied to landscape metrics defined in FRAGSTATS

Abstract:

A programme for spatial analysis based on a grid of pixels (FRAGSTATS 3.0) was used and the results of the analysis of 50 maps of land occupation using this programme were presented. 33 metrics of the landscape's structure were used and the properties of the metrics for various landscapes (maps of land occupation in Continental Portugal) were investigated. The metrics of the landscape's structure describe the size and form of the landscapes, the abundance of each type of spot and the spatial distribution of similar or different spots. To overcome the ambiguity of individual metrics and behavioural peculiarities, a varied factorial approach was adopted to describe and compare landscape structures. An analysis of main components for the 33 metrics and 50 landscapes was carried out. The first five factors explain 91.2% of the variation. These factors can be interpreted as an average of compaction of the spot, image texture (distribution of the pixels and proximity), landscape area, number of classes, area-perimeter relation (fractional measures).

Keywords: Landscape structure, Factorial approach, Fragstats

 

Resumo:

Um programa de análise espacial baseado numa grelha de pixeis (FRAGSTATS 3.0) foi usado e os resultados da análise de 50 mapas de ocupação do solo usando esse programa são apresentados. Foram usadas 33 métricas da estrutura da paisagem e investigadas as propriedades das métricas para diversas paisagens (mapas de ocupação de solo de Portugal Continental). As métricas da estrutura da paisagem descrevem o tamanho e forma das paisagens, a abundância de cada tipo de mancha e a distribuição espacial de manchas similares ou dissimilares. Para ultrapassar a ambiguidade de métricas individuais e peculiaridades do seu comportamento, foi adoptada uma aproximação factorial multivariada para descrever e comparar estruturas da paisagem. Foi executada uma análise de componentes principais para as 33 métricas e 50 paisagens. Os primeiros cinco factores explicam 91.2% da variação. Estes factores podem ser interpretados como média da compactação da mancha, textura da imagem (distribuição dos pixeis e adjacência), área da paisagem, número de classes, relação área - perímetro (medidas fractais).

 

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