1. A method comprising: receiving probe data for a geographic area; identifying a plurality of points in the probe data, wherein each of the plurality of points includes a geographic location and a heading; performing a translation on the plurality of points in the probe data in a predetermined direction orthogonal to the corresponding heading; aggregating the plurality of points, after translating, according to a location grid; performing an analysis on the plurality of points in the location grid according to the heading; and identifying a center of a roundabout road formation based on the analysis.