An example of showing map data from public source to browser - http://www.infoq.com/cn/articles/visualization-of-the-global-seismic-system

Opensource map - https://graphhopper.com/

Absolute location: how the equator, meridians, and our system of positioning work - https://www.zmescience.com/other/feature-post/absolute-location-how-the-equator-meridians-and-our-system-of-positioning-work/