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Download e-book for iPad: Advances in Spatial and Temporal Databases: 9th by Christian Böhm, Hans-Peter Kriegel, Peer Kröger, Petra

By Christian Böhm, Hans-Peter Kriegel, Peer Kröger, Petra Linhart (auth.), Claudia Bauzer Medeiros, Max J. Egenhofer, Elisa Bertino (eds.)

ISBN-10: 3540281274

ISBN-13: 9783540281276

It is our nice excitement to introduce the papers of the complaints of the ninth - ternational Symposium on Spatial and Temporal Databases – SSTD 2005. This year’s symposium keeps the culture of being the most well known discussion board for the presentation of study effects and event experiences on cutting edge problems with spatialandtemporaldatabasesystems, together with information models,systems,appli- tions and idea. The challenge of the symposium is to percentage leading edge ideas that ful?ll the desires of novel functions and heterogeneous environments and determine new instructions for destiny examine and improvement. SSTD 2005 supplies researchers and practitioners a different chance to proportion their views with others drawn to a few of the points of database platforms for handling spatial and temporal facts and for assisting their purposes. a complete of seventy seven papers have been submitted this yr from a number of nations. After an intensive overview approach, this system committee accredited 24 papers masking numerous subject matters, together with indexing ideas and question processing, cellular environments and relocating gadgets, and spatial and temporal info streams. we're more than happy with the diversity of the symposium’s issues, and we're pleased with the ensuing robust program.

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Read or Download Advances in Spatial and Temporal Databases: 9th International Symposium, SSTD 2005, Angra dos Reis, Brazil, August 22-24, 2005. Proceedings PDF

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Additional info for Advances in Spatial and Temporal Databases: 9th International Symposium, SSTD 2005, Angra dos Reis, Brazil, August 22-24, 2005. Proceedings

Sample text

In our context, a time series for each region in the space is formed by collecting the selectivity values over time, whether they are exact values collected from the queries, or estimates computed by the previous technique. , a, b, c), then the time series can be considered a sequence over a finite alphabet Σ = {a, b, c, · · · }. Periodically, the histogram manager tries to see if any periodic pattern exists in any cell of the histogram. We use the periodicity mining technique in [13]. When we detect a periodic pattern in a dark cell of the grid, we no longer compute its selectivity estimate as being uniformly distributed on all the dark regions.

Simulating user mobility is crucial for mobile computing and spatial database research. However, all existing moving object generators assume a fixed and often unrealistic mobility model. In this paper, we represent the moving behavior as a trajectory in the location-temporal space and propose two generic metrics to evaluate a trajectory dataset. In this context, trajectory generation is treated as an optimization problem and a framework, GAMMA, is proposed to solve it by the genetic algorithm. We demonstrate GAMMA’s practicability and flexibility by configuring it for two specific simulations, namely, cellular network trajectory and symbolic location tracking.

1 N2 N N i=1 j=1 H[i, j] Sij (7) The selectivity estimate of existing queries is calculated by consulting lit buckets in the ST-Histogram. However, to get a selectivity estimate for a new arriving queries, dark buckets in the ST-Histogram may be consulted, yielding to higher relative error. Figure 9 gives the performance of estimating the selectivity of a bucket in an ST-Histogram (averaged over all buckets). β measures how accurate the selectivity estimates of any new arriving query. The histogram manager is able to estimate the current selectivity for any new query with an average error of 39% when the coverage are is 20%.

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Advances in Spatial and Temporal Databases: 9th International Symposium, SSTD 2005, Angra dos Reis, Brazil, August 22-24, 2005. Proceedings by Christian Böhm, Hans-Peter Kriegel, Peer Kröger, Petra Linhart (auth.), Claudia Bauzer Medeiros, Max J. Egenhofer, Elisa Bertino (eds.)


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