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GPS localization in outdoor scenarios dominates the past few decades. However, in the metropolis, GPS could not provide precise location for drivers not only because of the weak GPS signal, but also the complicated road infrastructure. With the rapid development of micro electronic and mechanical system, most of the smartphones nowadays are equipped with multiple sensors, such as accelerometer, gyroscope, and magnetometer. These sensors offer a good opportunity for providing additional sensory data, which could be used to elevate the location accuracy while driving. We develop Smart-Loc, a novel smartphone based localization technique for localization in the city. While locating, It also integrates the ability of self-learning, which provide more accurate location while driving.