Abstract: Studying real- time shadow generating and rendering algorithms in digital earth virtual reality scenes, a new method was provided to improve the shadow rendering quality and efficiency of earth scenes, based on the characteristics of huge dataset, huge coordinates and frequent scheduling mechanisms. Comparing with the classics CSM shadow map algorithm, the method proposed focused on the optimization of shadow splitting ranges, as well as a new pipeline separating the rendering steps of terrain tiles and objects, so to improve both the correctness and efficiency. analyzes The problems caused by shadow rendering while running dynamic terrain tile scheduler simultaneously were analyzed, and a practicable solution was provided for it, as well as some future plans.

Key words: digital earth, real-time shadows, dynamic scheduler, shadow map algorithm