A method for determining that a vehicle is present in a parking space, the method comprising: measuring , by a parking sensor device , a plurality of magnetic field strength measurements using a magnetometer ; storing the plurality of magnetic field strength measurements; and determining that the vehicle is parked proximate to the parking sensor device within the parking space at least partially based on a magnetic field strength measurement and a vehicle-detection baseline, the method being characterized by : evaluating the plurality of magnetic field strength measurements to determine a number of the plurality of magnetic field strength measurements that are within each magnetic field strength window of a plurality of magnetic field strength windows, wherein each magnetic field strength window defines a different range of magnetic field strengths; and selecting a magnetic field strength window as the vehicle-detection baseline based upon a greatest number of magnetic field strength measurements of the plurality of magnetic field strength measurements being evaluated to be within the magnetic field strength window; and wherein determining that the vehicle is parked proximate to the parking sensor device within the parking space is at least partially based on a magnetic field strength measurement being outside of the selected magnetic field strength window. measuring , by a parking sensor device , a plurality of magnetic field strength measurements using a magnetometer ; storing the plurality of magnetic field strength measurements; and determining that the vehicle is parked proximate to the parking sensor device within the parking space at least partially based on a magnetic field strength measurement and a vehicle-detection baseline, the method being characterized by : evaluating the plurality of magnetic field strength measurements to determine a number of the plurality of magnetic field strength measurements that are within each magnetic field strength window of a plurality of magnetic field strength windows, wherein each magnetic field strength window defines a different range of magnetic field strengths; and selecting a magnetic field strength window as the vehicle-detection baseline based upon a greatest number of magnetic field strength measurements of the plurality of magnetic field strength measurements being evaluated to be within the magnetic field strength window; and wherein determining that the vehicle is parked proximate to the parking sensor device within the parking space is at least partially based on a magnetic field strength measurement being outside of the selected magnetic field strength window. evaluating the plurality of magnetic field strength measurements to determine a number of the plurality of magnetic field strength measurements that are within each magnetic field strength window of a plurality of magnetic field strength windows, wherein each magnetic field strength window defines a different range of magnetic field strengths; and selecting a magnetic field strength window as the vehicle-detection baseline based upon a greatest number of magnetic field strength measurements of the plurality of magnetic field strength measurements being evaluated to be within the magnetic field strength window; and wherein determining that the vehicle is parked proximate to the parking sensor device within the parking space is at least partially based on a magnetic field strength measurement being outside of the selected magnetic field strength window. <EOS>