The virtual real-time rambling of complex scenes is one of the important applications of virtual reality which has wide foreground in the military simulation training field.

The employments of HLA-based applications in the military fields such as simulations of new weapons and battles are increasing, and data collection (DC) plays a very important part.

The increasing application demand of distributed virtual GIS in terrain landscape and military has made real-time interactive browsing massive terrain data in large areas under network environment.