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Detecção de outliers espaciais: refinamento de similaridade e desempenho

Authors: Kawabata, Thatiane;

Detecção de outliers espaciais: refinamento de similaridade e desempenho

Abstract

O avanço e desenvolvimento de tecnologias utilizadas na coleta de informações georreferenciáveis proporcionou um aumento na quantidade de dados espaciais armazenados nas bases de dados. Isso também acarretou muitos problemas, comuns em grandes bases de dados, tais como: redundância de dados, dados incompletos, valores desconhecidos e outliers. Com o objetivo de obter informações relevantes dos dados espaciais, a aplicação de algoritmos de prospecção de dados espaciais, principalmente os algoritmos de agrupamentos espaciais, tornou-se uma prática bastante recorrente em todo cenário mundial. Por outro lado, muitos algoritmos atuais desconsideram a presença de outliers locais em dados espaciais, ou apenas consideram a sua localidade em relação aos demais dados da base, o que pode gerar resultados inconsistentes e dificultar a extração de conhecimento. Dessa forma, com o propósito de contribuir nesse sentido, o trabalho visa elaborar um levantamento de informações relacionadas a prospecção de dados espaciais, detecção de outliers convencionais e espaciais, assim como, apresentar os principais trabalhos no estado da arte. Por fim, propõe-se disponibilizar uma abordagem configurável e portável aos resultados dos algoritmos de agrupamento espaciais, na qual inclui-se uma melhoria em um algoritmo de detecção de outliers espaciais, que visa a prospecção de informações no conjunto de dados

The progress and development of technologies used to collect spatial information resulted in an increase in the amount of spatial data stored in databases. This also caused many problems, common in large databases, such as data redundancy, incomplete data, unknown values and outliers. Aiming to obtain relevant information from spatial data, the application of algorithms for exploration of spatial data, especially spatial clusters of algorithms, has become a fairly common practice across the world scene. Moreover, many current algorithms ignore the presence of local outliers in spatial data, or just consider your location in relation to other data in base, which can cause inconsistent results and complicate the extraction of knowledge. Thus, in order to contribute to this, the work aims to develop a survey of information related to exploration of spatial data, detection of conventional and spatial outliers, as well as, present the main work in state of the art. Finally, we propose to provide a portable and configurable algorithms to the results of spatial clustering approach, which includes an improvement on an algorithm to detect spatial outliers, aimed at prospecting for information in the dataset

Pós-graduação em Ciência da Computação - IBILCE

Country
Brazil
Keywords

Mineração de dados (Computação), Algoritmos de computador, Sistemas de dados especiais, Computação, Sistemas de informação geografica

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    popularity
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    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green