关键词: 抽壳方法;模型轻量化;BIM模型;GIS;

Abstract: In this paper,a BIM model lightweight method of shell-extraction was proposed based on GIS software. According to two shell-extraction methods of viewshed analysis and buffer zone analysis,we compared the refinement degree and processing time of BIM model lightweight by the two methods that are applied to the simple regular BIM model and the complex irregular BIM model. The results showed that:(1) the shell-extracting method of viewshed analysis was only applicable to the simple and regular BIM model,with fast processing time and high precision；(2) the shell-extracting method of buffer zone analysis could be applied to complex and irregular BIM models with high precision model components but long shell-extraction time. By comparing the data before and after shell extraction,it was concluded that the data obtained by BIM model after shell extraction was greatly optimized in terms of both memory size and average frame rate displayed on WebGL,which made the BIM model with large amount of data to be browsed interactively.

Key words: shell-extracting method; model lightweight; BIM model; GIS;