A method (100, 300) for estimating parking occupancy, comprising: defining a zone encompassing a parking meter; acquiring parking meter transaction data for the parking meter; evaluating the parking meter transaction data to determine status data for one or more parking spaces, the status data comprising an estimation as to whether the one or more parking spaces are available or occupied, the status data comprising an estimated availability time at which one or more occupied parking spaces are estimated to become available; estimating a parking occupancy for the zone based upon the status data; characterized by acquiring vehicle flow data associated with one or more vehicles wherein the vehicle flow data are provided by the vehicles; evaluating the vehicle flow data to determine a start trip count of vehicles that started trips from the zone; evaluating the vehicle flow data to determine an end trip count of vehicles that ended trips in the zone; determining a net number of vehicles within the zone at a point of time based upon a difference between the end trip count and the start trip count; integrating the net number of vehicles over time to determine a net number of vehicles observed to be remaining in the zone compared to leaving the zone; and updating the parking occupancy for the zone based upon the net number of vehicles observed to be remaining in the zone compared to leaving the zone and matching the parking meter transaction data to the net number of vehicles observed to be remaining in the zone compared to leaving the zone to obtain a scale factor and offset and applying the scale factor and offset to the net number of vehicles observed to be remaining in the zone compared to leaving the zone to create an updated parking occupancy for the zone; and displaying the updated parking occupancy through a user interface. defining a zone encompassing a parking meter; acquiring parking meter transaction data for the parking meter; evaluating the parking meter transaction data to determine status data for one or more parking spaces, the status data comprising an estimation as to whether the one or more parking spaces are available or occupied, the status data comprising an estimated availability time at which one or more occupied parking spaces are estimated to become available; estimating a parking occupancy for the zone based upon the status data; acquiring vehicle flow data associated with one or more vehicles wherein the vehicle flow data are provided by the vehicles; evaluating the vehicle flow data to determine a start trip count of vehicles that started trips from the zone; evaluating the vehicle flow data to determine an end trip count of vehicles that ended trips in the zone; determining a net number of vehicles within the zone at a point of time based upon a difference between the end trip count and the start trip count; integrating the net number of vehicles over time to determine a net number of vehicles observed to be remaining in the zone compared to leaving the zone; and updating the parking occupancy for the zone based upon the net number of vehicles observed to be remaining in the zone compared to leaving the zone and matching the parking meter transaction data to the net number of vehicles observed to be remaining in the zone compared to leaving the zone to obtain a scale factor and offset and applying the scale factor and offset to the net number of vehicles observed to be remaining in the zone compared to leaving the zone to create an updated parking occupancy for the zone; and displaying the updated parking occupancy through a user interface.