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As maps get busier, marker clustering is likely to be needed. Marker clustering is a technique by which several points of interest can be represented by a single icon when they’re close to one another.

Mika Tuupola wrote a PHP library that divides the map into a given number of cells and represents all the markers present in the same cell by a single icon. This icon shows the number of markers it symbolizes.

He also wrote an excellent post explaining how marker clustering works.

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About the Author Federico

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