Download e-book for iPad: Advances in Spatial and Temporal Databases: 7th by Jianwen Su, Haiyan Xu, Oscar H. Ibarra (auth.), Christian S.

By Jianwen Su, Haiyan Xu, Oscar H. Ibarra (auth.), Christian S. Jensen, Markus Schneider, Bernhard Seeger, Vassilis J. Tsotras (eds.)

ISBN-10: 354042301X

ISBN-13: 9783540423010

The 7th foreign Symposium on Spatial and Temporal Databases (SSTD 2001), held in Redondo seashore, CA, united states, July 12{15, 2001, introduced jointly prime researchers and builders within the region of spatial, temporal, and spatio-temporal databases to debate the cutting-edge in spatial and temporal information administration and functions, and to appreciate the demanding situations and - seek instructions within the advancing region of information administration for relocating gadgets. The symposium served as a discussion board for disseminating learn in spatial and temporal info administration, and for maximizing the interchange of data between researchers from the tested spatial and temporal database com- nities. The trade of analysis principles and effects not just contributes to the tutorial enviornment, but additionally bene ts the person and advertisement groups. SSTD 2001 was once the 7th within the sequence of symposia that begun in Santa Barbara a dozen years in the past and has on the grounds that been held each years, in Zurich, Singapore, Portland (Maine), Berlin, and Hong Kong. by means of 1999, the sequence had turn into good confirmed because the most suitable foreign discussion board committed exclusively to spatial database administration, and it used to be made up our minds to increase the scope of the sequence to additionally conceal temporal database administration. This prolonged scope was once selected due, partly, to the expanding significance of analysis that considers spatial and temporal facets jointly.

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Extra info for Advances in Spatial and Temporal Databases: 7th International Symposium, SSTD 2001 Redondo Beach, CA, USA, July 12–15, 2001 Proceedings

Sample text

For each trajectory T of S we consider the trajectory segments that are "alive" between starttime and endtime. T is in the answer set if and only if at least one of them is within route-distance 5km from R. (2As): ALONG SHORTEST PATH / ALWAYS BETWEEN, assuming that the cost 5 is given in terms of distance: Here we will use again the spatiotemporal index mentioned in previous sections. The query box Q must contain all the space that can be covered by an object starting from R moving along the shortest path in any direction between starttime and endtime.

If none of them is present in the query ALONG EXISTING PATH is used as the default value. b. ALWAYS BETWEEN and SOMETIMES BETWEEN starttime AND endtime. These optional quantifiers relate to the temporal duration of the A Spatiotemporal Model and Language for Moving Objects on Road Networks 25 WITHIN criterion. The former requires that the WITHIN criterion is true for all times between the starttime and endtime values, while the latter requires that the WITHIN criterion is true for some times between starttime and endtime.

If e2 is not more than 5km away from LOC(o,starttime), then we consider endtime. If endtime <= WHEN_AT(o,e2), this means that at endtime the object has not reached the point R (for the second time) yet; but then clearly it will reach R again within 5km. Thus the trajectory satisfies the condition, and the algorithm continues to examine the next trajectory. e. if endtime > WHEN_AT(o,e2), we have to examine whether the sub-trajectory between e2 and endtime satisfies the condition with respect to e3, e4, etc.

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Advances in Spatial and Temporal Databases: 7th International Symposium, SSTD 2001 Redondo Beach, CA, USA, July 12–15, 2001 Proceedings by Jianwen Su, Haiyan Xu, Oscar H. Ibarra (auth.), Christian S. Jensen, Markus Schneider, Bernhard Seeger, Vassilis J. Tsotras (eds.)


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