How is the real-time traffic information of Gaode Navigation obtained?

At present, there are three major companies providing road services, namely Qualcomm, Peking University Qian Fang (which acquired the former Zhangcheng) and Kyushu Yu Lian. They provide data to users of traffic data such as Baidu map and Google map. The main model of road condition collection is the floating car model, that is, the speed and direction of the floating car are recorded by GPS, and then the road condition is calculated according to road matching. At present, the main floating cars are provided by taxi companies. There are also some high-cost road conditions collection methods, such as ground loops, speed cameras, etc. These data are generally in the national departments. A relatively high-cost way is to report at a fixed location, that is, there are special reporters or equipment at a fixed location to report the road conditions in real time. The traditional road information detection method is to install ground loop, speed radar and video monitoring tools on urban main roads. These devices are mainly used to detect traditional road information, such as road occupancy, traffic flow and speed. Road information monitoring based on GPS mainly depends on GPS in taxis. For example, the GPS terminal in a taxi in Guangzhou will send information to the monitoring center regularly (10s~30s), including the location information of the vehicle, and then purchase the right to use this information. What I said above is very good. In addition, basically every car has navigation. Even if there is no driver, map software is installed on the mobile phone. The software background will automatically display the current positioning data to the switchboard. There is always a chance to judge whether the road section is clear or congested according to the moving speed of your positioning data. Everyone knows that Ali's big data is awesome. This is also a fact. Don't ask me how I know. I'm Gao De who updated the map. In fact, mobile phones also have built-in sensors. If the acceleration sensor is often overloaded, it will feedback that the vehicle often brakes or starts, which proves that the road conditions are congested at this time.