Loading...
Publication
Algumas técnicas SIG úteis à obtenção de áreas de serviço de conjuntos de pontos
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 2 MB | Adobe PDF |
Advisor(s)
Abstract(s)
Em estudos de acessibilidade, e não só, são muito úteis um tipo de estruturas que se podem obter a partir de uma rede, eventualmente multi-modal e parametrizável: as chamadas “áreas de serviço”, as quais são constituídas por polígonos, cada qual correspondente a uma zona situada entre um certo intervalo de custo, relativamente a uma certa “feature” (ponto, multiponto, etc.). Pretende-se neste estudo obter, a partir de áreas de serviço relativas a um universo de features, áreas de serviço relativas a subconjuntos dessas features. Estas técnicas envolvem manipulações relativamente complexas de polígonos e podem ser generalizadas para conjuntos de conjuntos e assim sucessivamente. Convém notar que nem sempre se dispõe da rede, podendo dispor-se das referidas estruturas; eventualmente, no caso de áreas de serviço, sob a forma de imagens (raster) a serem convertidas para formato vectorial.
In studies of accessibility, but not only, it is useful to consider, among others, a type of structures that can be obtained from a network, eventually multimodal and parameterizable: the so-called “service areas”, which are made out of polygons, each corresponding to a zone between a certain impedance interval, with respect to a certain feature (point, multipoint, etc.). This study aims at obtaining, form service areas relative to a universe of features, service areas relative to subsets of those features. These techniques deal with relatively complex polygon manipulations and can be generalized for sets of sets, and so forth. It is worth noting that the network may not always be available, although the aforementioned structures usually are; eventually, for service areas, under the form of (raster) images, to be converted into vector format.
In studies of accessibility, but not only, it is useful to consider, among others, a type of structures that can be obtained from a network, eventually multimodal and parameterizable: the so-called “service areas”, which are made out of polygons, each corresponding to a zone between a certain impedance interval, with respect to a certain feature (point, multipoint, etc.). This study aims at obtaining, form service areas relative to a universe of features, service areas relative to subsets of those features. These techniques deal with relatively complex polygon manipulations and can be generalized for sets of sets, and so forth. It is worth noting that the network may not always be available, although the aforementioned structures usually are; eventually, for service areas, under the form of (raster) images, to be converted into vector format.
Description
Keywords
Acessibilidade a conjuntos de pontos Sistemas de informação geográfica ArcGIS Áreas de serviço Accessibility to sets of points Geographical information systems ArcGIS Service areas
Citation
Publisher
Imprensa da Universidade de Coimbra