Data/hora: 19/06/2024 23:41:29

Biblioteca(s): 	Embrapa Meio Ambiente.	
Data corrente: 	09/05/2007	
Data da última atualização: 	13/08/2015	
Autoria: 	ASSUNÇÃO, R. M.; NEVES, M. C.; CÂMARA, G.; FREITAS, C. C.	
Afiliação: 	R. M. ASSUNÇÃO, Departamento de Estatística/UFMG; MARCOS CORREA NEVES, CNPMA; G. CÂMARA, Divisão de Processamento de Imagens/INPE; C. C. FREITAS, Divisão de Processamento de Imagens/INPE.	
Título: 	Efficient regionalization techniques for socio-economic geographical units using minimum spanning trees.	
Ano de publicação: 	2006	
Fonte/Imprenta: 	International Journal of Geographical Information Science, London, v. 20, n. 7, p. 797-811, ago. 2006.	
Idioma: 	Inglês	
Conteúdo: 	Regionalization is a classification procedure applied to spatial objects with an areal representation, which groups them into homogeneous contiguous regions. This paper presents an efficient method for regionalization. The first step creates a connectivity graph that captures the neighbourhood relationship between the spatial objects. The cost of each edge in the graph is inversely proportional to the similarity between the regions it joins. We summarize the neighbourhood structure by a minimum spanning tree (MST), which is a connected tree with no circuits. We partition the MST by successive removal of edges that link dissimilar regions. The result is the division of the spatial objects into connected regions that have maximum internal homogeneity. Since the MST partitioning problem is NP-hard, we propose a heuristic to speed up the tree partitioning significantly. Our results show that our proposed method combines performance and quality, and it is a good alternative to other regionalization methods found in the literature.	
Palavras-Chave: 	Método de regionalização; Otimização; Particionamento de grafos; Procedimento de classificação; Técnicas; Unidades geográficas.	
Categoria do assunto: 	X Pesquisa, Tecnologia e Engenharia	
Registro original: 	Embrapa Meio Ambiente (CNPMA)	
Exemplares: 	CNPMA - (6780-1) - UPC - AP - DD -  -  - 2006AP_005 - DIS