为了分析GIS图上地理曲线的定位精度，首先探讨地理曲线的表达与定位误差，区分“数字曲线”和“连续曲线”两个概念；
To analyze positional accuracy of geographical lines in GIS, this paper begins with a discussion on the representation and positional errors of linear features.
仿真实验结果表明，带反馈的实时融合数据方法对不同服务加以区分，有效地保证了紧急数据的实时处理，且没有降低数据的融合精度。
The results of simulation demonstrate that the proposed FRDA can effectively guarantee the realtime performance of urgent data processing, while does not decrease the precision of data.
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