How to calculate latitude and longitude road coordinates

Google loads api.

I'm also a non-expert, so I'm careful, but I'll give you a little tip about it.

Map transformation and coordinate transformation are required. WGS-84 and others are common formats. It's usually written in vector form. If it's a limited area, I sometimes use Google Maps to export the coordinates...) and exporting them...

After that, it's a programming area, but I save the AREA area on the map separately. It is also saved as XML/Vector, etc.

But the problem is that GPS itself has an error of about 10 meters. So I can't know the road exactly. Navi companies are therefore applying their own calibration methods.

Thank you.