  This is the preprint version of our paper on Advances in Engineering
Software. With several characteristics, such as large scale, diverse
predictability and timeliness, the city traffic data falls in the range of
definition of Big Data. A Virtual Reality GIS based traffic analysis and
visualization system is proposed as a promising and inspiring approach to
manage and develop traffic big data. In addition to the basic GIS interaction
functions, the proposed system also includes some intelligent visual analysis
and forecasting functions. The passenger flow forecasting algorithm is
introduced in detail.
