نتایج جستجو برای: spatial clustering

تعداد نتایج: 457055  

Journal: :The American journal of tropical medicine and hygiene 2013
Nathaniel H Schafrick Meghan O Milbrath Veronica J Berrocal Mark L Wilson Joseph N S Eisenberg

Mosquito management within households remains central to the control of dengue virus transmission. An important factor in these management decisions is the spatial clustering of Aedes aegypti. We measured spatial clustering of Ae. aegypti in the town of Borbón, Ecuador and assessed what characteristics of breeding containers influenced the clustering. We used logistic regression to assess the s...

2010
Jessica Lin Guido Cervone Nigel Waters Sujing Wang Chun-Sheng Chen Vadeerat Rinsurongkawong Fatih Akdag Christoph F. Eick Andre Fabiano de Moraes Lia Bastos

Polygons can serve an important role in the analysis of georeferenced data as they provide a natural representation for particular types of spatial objects and in that they can be used as models for spatial clusters. This paper claims that polygon analysis is particularly useful for mining related, spatial datasets. A novel methodology for clustering polygons that have been extracted from diffe...

Journal: :JSEA 2010
Xiankun Yang Weihong Cui

Exploratory data analysis is increasingly more necessary as larger spatial data is managed in electro-magnetic media. Spatial clustering is one of the very important spatial data mining techniques which is the discovery of interesting relationships and characteristics that may exist implicitly in spatial databases. So far, a lot of spatial clustering algorithms have been proposed in many applic...

2010
Sujing Wang Chun-Sheng Chen Vadeerat Rinsurongkawong Fatih Akdag Christoph F. Eick Andre Fabiano de Moraes Lia Bastos

Polygons can serve an important role in the analysis of georeferenced data as they provide a natural representation for particular types of spatial objects and in that they can be used as models for spatial clusters. This paper claims that polygon analysis is particularly useful for mining related, spatial datasets. A novel methodology for clustering polygons that have been extracted from diffe...

Journal: :BMC Veterinary Research 2008
Lourens Heres Dick J Brus Thomas J Hagenaars

BACKGROUND In many of the European countries affected by Bovine Spongiform Encephalopathy (BSE), case clustering patterns have been observed. Most of these patterns have been interpreted in terms of heterogeneities in exposure of cattle to the BSE agent. Here we investigate whether spatial clustering is present in the Dutch BSE case data. RESULTS We have found three spatial case clusters in t...

2005
Ji Zhang Han Liu

In this paper, we will propose a distributable clustering algorithm, called Distributed-GridMST (D-GridMST), which deals with large distributed spatial databases. D-GridMST employs the notions of multi-dimensional cube to partition the data space involved and uses density criteria to extract representative points from spatial databases, based on which a global MST of representatives is construc...

Javdan, Mojtaba, Kazemi, Simin, Ziaee, Mahmoud,

 Introduction: Current trend regarding tourism spatial development both at macro and micro regional level, following the county spatial development structure is relatively chaotic. There exist an imbalance with respect to access to different opportunities as well as resources and benefits. The consequences of this disorder is exemplified itself in low performance of peripheral tourism destin...

Journal: :GeoInformatica 2003
Diansheng Guo Donna Peuquet Mark Gahegan

The unprecedented large size and high dimensionality of existing geographic datasets make the complex patterns that potentially lurk in the data hard to ®nd. Clustering is one of the most important techniques for geographic knowledge discovery. However, existing clustering methods have two severe drawbacks for this purpose. First, spatial clustering methods focus on the speci®c characteristics ...

2001
Alexandros Nanopoulos Yannis Theodoridis Yannis Manolopoulos

In this paper we present CP, a new clustering algorithm for large spatial databases, which exploits spatial access methods for the determination of closest pairs. Several extensions are presented for scalable clustering in large databases that contain clusters of various shapes and outliers. Due to its characteristics, the proposed algorithm attains the advantages of hierarchical clustering and...

2013
Abhaya Kumar Sahoo

Cluster detection in Spatial Databases is an important task for discovery of knowledge in spatial databases and in this domain density based clustering algorithms are very effective. Density Based Spatial Clustering of Applications with Noise (DBSCAN) algorithm effectively manages to detect clusters of arbitrary shape with noise, but it fails in detecting local clusters as well as clusters of d...

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