Abstract: Lots of researches on Web 3D digital maps pay more attention to 3D model displaying and despise 3D annotation displaying, which can not provide map semantic information properly to consumers. A Web 3D annotation display technique in the large scenes is put forward to achieve tridimensional exhibition of large amounts annotations in 3D digital maps and provide explicit semantic guidance. 3D display experiment on Zhejiang new fundamental surveying and mapping products shows that, the technique can build 3D annotation LOD model conveniently and provide 3D annotation services and increase annotation efficiency. This technology can be applied to areas such as Tianditu, natural resources spatial basic information platform and real estate registration platform.

Key words: Web 3D, annotation, LOD model, large scenes, 3D digital map, CesiumJS