How does google maps knows that there is a road over this place i mean we have roads all covered with dense trees so if they use satellite’s, the satellite’s hardly can see a road from top, so how do they figure out?

Question

How does google maps knows that there is a road over this place i mean we have roads all covered with dense trees so if they use satellite’s, the satellite’s hardly can see a road from top, so how do they figure out?

In: 4

Answer 1

Most governments and towns have maps of where their roads are. Google has access to these maps. For example, [this file](https://www.census.gov/cgi-bin/geo/shapefiles/index.php) contains the US Census data on where roads and stuff are.

This information is supplemented by the Google Street View cars that drive around. If you’ve ever looked at Google Street View, you’ll see that Google has physically driven a car on the vast majority of major roads in the world.

Then, you can use satellite imagery to make some adjustments.