Use este identificador para citar ou linkar para este item:
https://locus.ufv.br//handle/123456789/22916
Tipo: | Artigo |
Título: | Efficient viewshed computation on terrain in external memory |
Autor(es): | Andrade, Marcus V. A. Magalhães, Salles V. G. Magalhães, Mirella A. Franklin, W. Randolph Cutler, Barbara M. |
Abstract: | The recent availability of detailed geographic data permits terrain applications to process large areas at high resolution. However the required massive data processing presents significant challenges, demanding algorithms optimized for both data movement and computation. One such application is viewshed computation, that is, to determine all the points visible from a given point p. In this paper, we present an efficient algorithm to compute viewsheds on terrain stored in external memory. In the usual case where the observer’s radius of interest is smaller than the terrain size, the algorithm complexity is θ(scan(n 2)) where n 2 is the number of points in an n × n DEM and scan(n 2) is the minimum number of I/O operations required to read n 2 contiguous items from external memory. This is much faster than existing published algorithms. |
Palavras-chave: | GIS External memory processing Viewshed Visibility maps |
Editor: | GeoInformatica |
Tipo de Acesso: | Springer Science+Business Media, LLC 2009 |
URI: | https://doi.org/10.1007/s10707-009-0100-9 http://www.locus.ufv.br/handle/123456789/22916 |
Data do documento: | Abr-2011 |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
---|---|---|---|---|
artigo.pdf Until 2100-12-31 | Texto completo | 736,91 kB | Adobe PDF | Visualizar/Abrir ACESSO RESTRITO |
Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.