1, traffic congestion data: this generally comes from professional data providers, these providers and the traffic department has deep cooperation, its data collection mainly rely on the GPS installed in cabs to collect real-time speed of the main, or through the camera, infrared probe, radar speed measurement speed as a supplement;

2, three-dimensional data: mainly rely on the laser scanning and hand-modeling processing

3. Fake 3D data (the kind of 45-degree 3D top view that can't be rotated): relies on photo shoots and handmade material textures;

4. Street View: relies on real-world photography.