High Accuracy Dynamic Highway Mapping Using a GPS/INS/CCD System with On-The-Fly GPS Ambiguity Resolution

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High Accuracy Dynamic Highway Mapping Using a GPS/INS/CCD System with On-The-Fly GPS Ambiguity Resolution

D. A. Grejner-Brzezinska / C. Toth

Conventionally, the road centerline surveys have been performed by the traditional survey methods, providing rather high, even sub-centimeter level of accuracy. The major problem, however, that the Departments of Transportation face, is the safety of the survey crew and the disruptions to the traffic flow, and to a large extent - even inaccessibility of some highways to the surveys crews due to safety hazard. The survey cost also becomes an issue, as due to the traffic and other environmental constraints, these surveys are relatively expensive, while the rate of production is slow, and therefore, frequent updates (re-surveys) are not feasible. This prompted the Ohio Department of Transportation, District 1, to replace the conventional survey by an automated mobile mapping system, which would collect the data while moving at the traffic speeds, ensuring at the same time the safety of the survey personnel.