One new genus, Zagrotes gen. nov., and 19 species of ground spiders (Gnaphosidae) are described from Iran: Berinda bifurcata sp. nov. (♂, Bushehr, Khuzestan; southwestern southern Iran), hoerwegi (♂♀, Fars, Ilam, Kermanshah, Kurdistan; western southcentral Berlandina artaxerxes (♂ Yazd; central Cryptodrassus iranicus Kermanshah; Drassodes persianus (♀, Sistan & Baluchistan; southeastern Ech...

The problem of indexing multidimensional objects is considered. First, a classification of existing methods is given along with a discussion of the major issues involved in multidimensional data indexing. Second, a variation to Guttman’s R-trees (R+-trees) that avoids overlapping rectangles in intermediate nodes of the tree is introduced. Algorithms for searching, updating, initial packing and ...

It is shown that for a metric space (M,d) the following are equivalent: (i) M is a complete R-tree; (ii) M is hyperconvex and has unique metric segments.

We present a new spatial index belonging to R-tree family. Since our new index comes out from the R-tree and holds the concept of nonoverlapping nodes we call it R-tree. The original R-tree was designed for both point and spatial data. Using R-tree for indexing spatial data is very inefficient. In our research we face the problem of indexing product catalogues data that can be represented as po...

R-tree based access methods for moving objects are hardly applicable in practice, due mainly to excessive space requirements and high management costs. To overcome the limitations of such R-tree based access methods, we propose a new index structure called AIM (Adaptive cell-based Index for Moving objects). The AIM is a cell-based multiversion access structure adopting an overlapping technique....