Based on multilayer grid index, we constructed caches both in client side and in server side.

This paper analyzed the performance of the improved multi-layer grid spatial index by real data test.

Introduced two technical methods of advancing real-time in the three-dimensional environment: the methods of external calls and intersected units that can increase the romancing speed of system and multi-level grids that can decrease effectively the network transmission and network latency, which can be used in all kinds of interactive simulation designs.

A hiberarchy index model was proposed to reduce the semantic gap by mapping the semantic concept from the domain knowledge ontology to the low-level features.

Realization of spatial object s precise grid index;

In this paper, the authors adopt an efficient full space Skyline maintaining method leveraging grid index structure, and based on this, propose an efficient top-town algorithm to incrementally output the .

This paper researches the construction of TIN,based on adopting self-adapt clump organization to establish grid index,and proposes a quick algorithm of constructing TIN.