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Spatial distribution pattern is significant to the map generalization and map matching. The roundabout is the typical representative of miniature ring-like pattern in road networks. Based on the principle of improved Hough transform to detect the circle, a geometric recognition method of roundabout is proposed in this paper. This method can be divided into two parts:circulating road recognition and branch recognition. Firstly, circulating road is identified by the circle recognition, uniformitydoi:10.11947/j.AGCS.2018.20170736 doaj:e645a57a0e0b43f88d3ccd7b3b3eff5d fatcat:byvq7tdhivcprir4qcscrrgt44