City large-area road network traffic sensing method based on plough satellite

The invention provides a city large-area road network traffic sensing method based on the plough satellite. The city large-area road network traffic sensing method comprises the steps of preprocessing plough satellite data; structuring a basic space road network; matching a plough satellite coordinate map; speculating driving routes; calculating the road segment average travel speed; supplementing historical data; correcting the road segment average travel speed; calculating road segment traffic operation indexes; judging road segment traffic state levels. According to the city large-area road network traffic sensing method, the traffic states within a large-area range of the road network are sensed by structuring a plough satellite data preprocessing model, a vehicle coordinate matching index model, a vehicle route planning module and a road segment traffic operation index model, the deviation of city road network plough satellite positioning is lowered under the high-rise building traffic environment, the collection and distribution accurate of city road traffic states are improved, and the traffic operation efficiency and the service level of the city road network are increased.