Abstract: In the multi-scale 3D scene, the single reference coordinate system has much application limitation due to the large spatial scale change, so the target will appear wobble phenomenon when the camera observes the target in a large distance from the reference coordinate. Due to the fact that the position and attitude of a spatial object change all the time under the unified time datum, the target will appear wobble phenomenon when the camera following a target observes a certain area near the target. A setting method of reference coordinate system based on the observation of the inertial coordinate system was proposed, which could effectively improve the display accuracy when the space scale changed. What’s more, a setting method of reference coordinate system based on the observation of the body-fixed coordinate system was proposed, which could effectively improve the display accuracy when the camera observed the target in a short distance.

Key words: multi-scale three-dimensional scene, floating error, observed target, display accuracy