Encoded Polylines are efficient, text-based ways to store line geometries. This is one of the most minimal formats: they're used to represent a single line geometry, without any properties or styling.
Here's an example encoded polyline:
Polylines are very popular in Google technology, and also in routing and directions systems. The route line when you request directions is usually available as a polyline - for example, in the Mapbox directions API.
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