Overall error model and experimental study of road curve in GIS

curves;  Stochastic processes;  mean squared integral;  error function;  Total error

The overall error of curve elements is described by means of mean square calculus of stochastic processes, the specific index of overall error of curve is defined with the numerical characteristics of the process, and the geometric significance of error indicators is analyzed. According to the process model, the scanning digitization test of the overall error of the curve is designed, a road curve is interpolated with high density by tertiary parameter spline, the road centerline is repeatedly collected, and 100 sample curves of the random process are obtained through conversion, on this basis, the error index value is estimated, the smoothness of the process is discussed, and the causes of systematic error in scanning digitization and the corresponding methods to reduce systematic error are analyzed. The test data generally represents the accuracy of road centerline scanning digitization.