Intergraph Corporation, "GIS/AM/FM Information," http://www:intergraph.com/utilmap.shtml, 1995.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....on spatial joins based on existing R tree indexes for both input data sets [3, 9] We refer to this type of join as R tree join in this paper. R tree joins are very important because R trees (and their variants) have become the most popular spatial access methods used by many spatial DBMS products [12, 24, 27]. Furthermore, the performance of R tree joins is one of the best among all spatial join strategies [20] Our cost model first estimates the number of expected I Os incurred during the filter step without considering the buffer effect (we assume a zero buffer size) We call it ZEIO for ....

Intergraph Corporation, "GIS/AM/FM Information," http://www:intergraph.com/utilmap.shtml, 1995.

....therefore they require spatial indexes for query optimization. Furthermore, in recent years, the R tree and its variants have become one of the most popular spatial access methods. Examples of spatial database systems which use R trees are the Illustra database [20] Intergraph s GIS databases [8], and Postgres [19] An important advantage of R tree based spatial joins is that the join process traverses both R tree hierarchies such that subtrees from both R trees are only explored further if the Minimum Bounding Rectangles (MBRs) of their root nodes satisfy the spatial predicate. Thus, ....

.... is the depth first Rtree join technique with various CPU and I O optimizations proposed in [3] Our assumption is based on the evidence that it is the most recently proposed spatial join technique based on existing indexes; it uses R trees which are deployed by many spatial database products [8, 19, 20]; and most importantly, its performance has become the yardstick used by other researchers to measure the performance of their recently proposed non index based spatial join methods [9, 10, 13] We have implemented this method with proper optimizations, and will call it DFRJ, which stands for ....

Intergraph Corporation, "GIS/AM/FM Information," http://www:intergraph.com/utilmap.shtml, 1995.

....an increase in the demands for systems that can store, manage, and manipulate spatial data. Increasingly, a database system has been employed to meet these requirements. Examples of commercial database systems that have been used for these applications are ARC INFO [Arc95] Intergraph s MGE [Cor95] and Illustra [Ube94] Data stored in these spatial database systems includes simple geometric types like points, lines, polygons, and surfaces, and more complex types like swiss cheese polygons (which are polygons with holes) that are derived from the simpler geometric types. A spatial ....

Intergraph Corporation. "GIS/AM/FM Information". "http://www.intergraph.com/utilmap.shtml", 1995.

....an increase in the demands for systems that can store, manage, and manipulate spatial data. Increasingly, a database system has been employed to meet these requirements. Examples of commercial database systems that have been used for these applications are ARC INFO [Arc95] Intergraph s MGE [Cor95] and Illustra [Ube94] Data stored in these spatial database systems includes simple geometric types like points, lines, polygons, and surfaces, This work was partially supported by NASA Contracts #USRA 555517, #NAGW 3895, and #NAGW 4229, and by an IBM Research Initiation Grant. and more ....

Intergraph Corporation. "GIS/AM/FM Information". "http://www.intergraph.com/utilmap.shtml", 1995.

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