نتایج جستجو برای: spatio temporal variation

تعداد نتایج: 526634  

2004
Jeffrey Levinton Brendan Kelaher

We contend that a range of phenomena characterizing temperate deposit-feeding communities in low-energy environments is strongly organized by two principal opposing forces: (1) spatially localized inputs of detritus or new recruits, leading to amosaic of initial patches, with subsequent impacts on spatio-temporal variation of species with limited mobility; and (2) the impact of mobile consumers...

2003
Jun CHEN Jie JIANG

Both structural and behavioral aspects need to be modeled in some spatio-temporal databases. There existing initial efforts to represent behavioral aspects of the spatio-temporal applications via events gave their priority to some local or partial behaviors rather than an overview of the system’s behavior. In this paper, an event-based approach is proposed for modeling the system’s behavior of ...

2001
Floris Geerts Sofie Haesevoets Bart Kuijpers

We address a fundamental question concerning spatio-temporal database systems: “What are exactly spatio-temporal queries?” We define spatio-temporal queries to be computable mappings that are also generic, meaning that the result of a query may only depend to a limited extent on the actual internal representation of the spatio-temporal data. Genericity is defined as invariance under transformat...

Journal: :EURASIP J. Adv. Sig. Proc. 2009
Dean J. Krusienski

Evoked and coordinated brain signals often exhibit distinct, individualized spatial and temporal characteristics, such as amplitude and phase couplings across and within spatial channels. In the study of these brain potentials, it is important to characterize both the spatial and temporal morphologies of the responses for a better understanding of both the physiology and function of the brain. ...

1998
Hiroshi Nozawa Naoki Saiwaki Shogo Nishida

This paper deals with spatio-temporal indexing methods for moving objects. Spatio-temporal indexing method gives a basis for data management structure for efficient search for large scale spatio-temporal data. In this paper. t\co types of indexing methods are proposed for managing spatio-temporal data for moving objects. Both methods are evaluated by computer simulation. and the merits and deme...

2008
Yang ping Tang Xinming Wang Huibing

As efforts grow to develop spatio-temporal database systems and temporal geographic information systems that are capable of conveying how geographic phenomena change, it is urgent to analyze the impetus and mechanism that the spatio-temporal process happed. The authors proposed a set of universal change patterns for modelling of spatio-temporal processes, which builds a fundamental basis for th...

Journal: :GeoInformatica 2016
Hang Yue Laurence R. Rilett Peter Z. Revesz

This paper presents a transportation spatio-temporal system that efficiently converts traffic video data into vehicular motion information in spatio-temporal databases for a variety of transportation applications. The proposed transportation spatio-temporal system interpolates the vehicle trajectory data (i.e., time, location, and speed), which are extracted from video, and integrates them with...

2017
Josu G. Alday Juan Martínez de Aragón Sergio de-Miguel José Antonio Bonet

Mushrooms are important non-wood-forest-products in many Mediterranean ecosystems, being highly vulnerable to climate change. However, the ecological scales of variation of mushroom productivity and diversity, and climate dependence has been usually overlooked due to a lack of available data. We determined the spatio-temporal variability of epigeous sporocarps and the climatic factors driving t...

Journal: :ACM Transactions on Information Systems 2001

Journal: :Optics Express 2009

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