The paper discuss as two key techniques: city geographical information system(GIS), real time correction of the deviation.
文中详细讨论了系统所采用的两项关键技术：地理信息库系统、车辆位置的实时修正。
The paper discuss as two key techniques: city geographical information system(GIS), real time correction of the deviation.
文中详细讨论了系统所采用的两项关键技术：地理信息库系统、车辆位置的实时修正。
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