How to display markers on the map, grouped by hitting a certain radius?

Question

Objective-C

Good afternoon, such a question.
Here, if we take for example any banking application or the same overscope, go to the map there, we see markers on the map that are grouped by falling into a certain radius. For example, there are ATMs within a radius of 500 meters, if you zoom out the card away from ATMs, then instead of two markers, one with the number 2 appears, so I need to do the same.
I have a list of markers with latitude and longitude stored in my database, so I need to select and group them according to conditions such as in banking applications, that is, by falling into a certain radius. In what way can this be implemented?
Thank you.

Answer 1

Read about map marker clustering in the Maps API.