166 research outputs found
Configuring the neighbourhood effect in irregular cellular automata based models
Cellular automata (CA) models have been widely employed to simulate urban growth and land use change. In order to represent urban space more realistically, new approaches to CA models have explored the use of vector data instead of traditional regular grids. However, the use of irregular CA-based models brings new challenges as well as opportunities. The most strongly affected factor when using an irregular space is neighbourhood. Although neighbourhood definition in an irregular environment has been reported in the literature, the question of how to model the neighbourhood effect remains largely unexplored.
In order to shed light on this question, this paper proposed the use of spatial metrics to characterise and measure the neighbourhood effect in irregular CA-based models. These metrics, originally developed for raster environments, namely the enrichment factor and the neighbourhood index, were adapted and applied in the irregular space employed by the model. Using the results of these metrics, distance-decay functions were calculated to reproduce the push-and-pull effect between the simulated land uses. The outcomes of a total of 55 simulations (five sets of different distance functions and eleven different neighbourhood definition distances) were compared with observed changes in the study area during the calibration period. Our results demonstrate that the proposed methodology improves the outcomes of the urban growth simulation model tested and could be applied to other irregular CA-based models
Contribuição ao estudo das atividades antifúngica e elicitora de fitoalexinas em sorgo e soja por eucalipto (Eucalyptus citriodora)
Desenvolvimento ponderal e diversidade fenotípica entre cruzamentos de ovinos Dorper com raças locais
SUPLEMENTAÇÃO ALIMENTAR DE CABRAS ANGLO-NUBIANAS NA ÉPOCA CHUVOSA, NA REGIÃO SEMI-ÁRIDA DO NORDESTE BRASILEIRO
An overview of Listeria monocytogenes contamination in ready to eat meat, dairy and fishery foods
O emprego da geoestatística na determinação do tamanho "ótimo" de amostras aleatórias com vistas à obtenção de estimativas dos volumes dos fustes de espécies florestais em Paragominas, estado do Pará
Desempenho de ovinos terminados em confinamento com resíduo desidratado de vitivinícolas associado a diferentes fontes energéticas
Influência da ordem e estádios da lactação no perfil bioquímico sangüíneo de cabras da raça Saanen
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