面向航空GIS的地图背景更新算法

An Algorithm for Updating Map Image Oriented to Aviation GIS

针对航空GIS的特点,提出了一种基于内存的地图背景更新算法.这种算法,在确保更新地图背景所需的最大系统时间开销基本上与传统方法相同的前提下,通过缓存最近一段时间内需要更新的地图背景,极大地减少在这段时间内每次更新地图背景时的时间开销,从而大大地提高了系统的性能.

Considering the features of GIS applied in aviation, an algorithm based on memory for updating map image was presented, which makes sure that the maximal time needed is nearly the same as time needed by the conventional way. This algorithm greatly reduces the time needed for updating map image each time by buffering the map image required for being updated in the latest period, therefore increases the performance of the system.