decode_Polyline: Decode Google polyline of an activity into latitude and longitude
Description
Decodes Google's polyline that are given in get_activity() and get_activity_list()
Usage
decode_Polyline(Google_polyline)
Arguments
Google_polyline
character element of Google polyline of an activity
Value
A vector of latitudes an longitudes in decimals separated by a comma
Details
When getting an activity using get_activity() a Google polyline is returned as one of the outputs. This function converts the polyline into latitude and longitude coordinates suitable for plotting. Function is used internally within get_latlon.
References
Original code from : https://s4rdd.blogspot.co.uk/2012/12/google-maps-api-decoding-polylines-for.html?showComment=1473004506791#c3610119369153401460