In many people's imagination, the navigation satellite is wandering in low-Earth orbit, shooting everything on the earth and then transmitting it back to the ground, so where the congestion and where it is smooth is clear at a glance, but in fact, the navigation satellite does not have this function.
GPS and China Beidou are both positioning satellites, not imaging satellites, which means that they cannot transmit images to the ground. They only send back location signals, so it is impossible to know which road is congested. Of course, there are also some surveying and mapping satellites running in the Earth's orbit, which can capture and transmit image information. However, there are so many cities and so many roads around the world. If you want to update the road conditions in real time through surveying and mapping satellites, the number of surveying and mapping satellites required is unimaginable.
Since the road conditions information is not told by the satellite to the navigation software, how do navigation know?
In fact, the real-time traffic conditions information in the navigation software is obtained after summarizing and computing based on multi-party data, and the most important part of the data is "crowdsourcing data". The so-called crowdsourcing data is actually the data information we provide to the navigation software ourselves. When we open the navigation, the software will ask us a question: "Do you agree to obtain location information?" If we choose No, then we cannot use navigation normally, because if people don't even know where we are, how can we navigate?
If we select "Yes", then the navigation software collects our location information.
At this time, if we are experiencing a congested area, our travel speed will become slow, and the navigation software will know this information. If many mobile phones using the navigation software in this area have similar information, the navigation software will make a judgment and mark the section as a "congested section". This is crowdsourcing data analysis. The source of crowdsourcing data is each of us, and the beneficiaries are also each of us, but crowdsourcing data analysis is not perfect.
often uses navigation and must have encountered similar situations, such as a section marked congested, but it was smooth when we drove over, while a section that did not show congestion was encountered again. Why is this happening to
? Because the source of crowdsourcing data is every user of the navigation software, if no one uses navigation on a congested section, the navigation software cannot obtain congestion information on the corresponding section. In turn, we can also take advantage of this defect and create congestion artificially. For example, if you place 200 mobile phones in the car, turn on the navigation, and then drive at a snail speed, then you may create a false congested section on the software. However, friendly reminders: Don’t play like this, as it will cause trouble to others, and secondly, it may cause trouble to yourself.
Of course, crowdsourcing data is only part of the real-time road condition information calculation of navigation software, and some data comes from traffic monitoring data from the transportation department and related road condition data from other companies.
The transportation department will share some of the traffic data with the navigation software company. With this data, the judgment of road conditions will be more accurate. For example, a section of the road is under construction, and there are many slow-moving vehicle information in this area, so it can be confirmed that there is congestion in this area.
