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

They scanned paper maps, which show a road at specific coordinates. And they can figure out coordinates of each pixel in a sattellite image, from position of sattellite and angle of its camera.

It is not very precise, you sometimes see google’s road line being a few meters off the actual road on the sattelite image.

but they can see road in winter images where leaves are gone, or see segments of road in areas with less trees, so they continue to correct these mistakes.