From the google page:

“Interactive Polyline Encoder Utility: Polylines in Google Maps are formed as a set of latitude/longitude pairs. In addition, for each point in an encoded polyline, a level can be specified indicating that the point should appear on that level and any level higher (i.e. any decrease in zoom.). “

You can use this tool to help you build your google map polylines. It will visualize the lines for you and even save the points as you go. The other useful thing is that if you just need the latitude and longitude of a single point on the earth you can get it quickly and easily. And, you know what it will look like, because you find it using a google map!

Interactive Polyline Encoder Utility AKA: LatLong Finder

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