从2006年起，中国已经在30个城市开展数字城市地理空间框架建设试点工程，今年，又增加了60个试点城市。
China launched pilot projects for digital surveying and mapping in 30 cities in 2006, which was extended to a further 60 cities this year.
地理空间数据框架是构建“数字城市”的数据平台，是建设“数字城市”的必要保证。
Geospatial data infrastructure is the data flat and essential guarantee of the construction of the "digital city".
提出了国家地理空间信息基准框架内改进与更新原有的大地坐标基准、高程基准和重力基准的建设道路及解决原则。
The higher requirement of the former coordinate datum, height datum and gravity datum was in dire need of improvement and update in modernization.
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