NovAtel's Annual Journal of GNSS Technology Solutions and Innovation

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Page 26 of 51

automated parking 2014 For more Solutions visit velocity 27 Positional Parameters The CPA is charged with implementing the City of Calgary's parking policies. The agency man- ages on- and off-street public parking facilities and enforcement programs and provides park- ing advisory services. Calgary has about 6,000 on street spaces located in about 800 zones, along with 7,000 off street spaces in surface lots and parking garages. In 2007, the CPA replaced all of its parking metres with the ParkPlus system, which allows payment via on-site pay machines or by a regis- tered ParkPlus cell phone account. Parking enforcement officers use Tannery Creek Systems' autoChalk® digital chalking and LPR system to monitor parking zones through- out the city. The fully automated heads up system is comprised of four cameras, a rugged laptop, two lasers, and a GNSS receiver to determine ac- curate time and position of observed vehicles. The autoChalk system scans up to two cars per second, at 40 km/h, on either side of the road and takes profile and license plate photos of each parked vehicle. Each autoChalk system daily scans and processes about 2000 vehicles parked on Calgary roads. Calgary has six autoChalk units. ParkPlus uses the license plate to associ- ate paid parking sessions with a vehicle, hence parked vehicles' license plates are automatically checked to see if they have a paid parking ses- sion. Every license plate image with an unreg- istered payment transaction is reviewed by en- forcement officers to verify if there is a parking violation. Miles Dyck, manager of Parking Enforcement for the CPA, explains, "The electronic system is not 100% accurate, so our officers must look at each unregistered plate to see if there's an error. For instance, maybe the camera reads the letter D as an O or 0. We also, don't issue tickets for The Calgary Parking Authority manages one of the most advanced automated parking systems in North America. vehicles that are actively loading or unloading, so those instances must be manually removed from the system." All citations are reviewed by a parking enforcement officer before issuing. Dyck added that the lengthiness of the man- ual review was compounded by the GPS errors. "In an urban environment like Calgary with tall structures, our GPS-enabled system could incorrectly locate parked vehicles by hundreds of meters," he says. "We weren't getting the correct GPS locations for 6-7% of the vehicles—that's about 1,400 vehicles every day that we would have enforcement officers manually review and place in the appropriate parking zones. Our offi- cers were spending 4-5 hours every day review- ing potential parking non-payment violations." SPAN Accuracy To correct the problem, Tannery Creek Systems, developer of the autoChalk solution, recom- " " Besides the time savings, the improvement in accuracy has been a great morale booster for our agency…

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