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Estimation of Horizontal Accuracy of the Large-Scale Digital Maps 41
points in respect of which the length of vector of shift of point differed signifi-cantly from the remaining lengths of vectors were discarded (vector lengths of: 0.37 m, 0.54 m and 0.87 m, where AL < 0.10 m in 93% of control points). At next stage, based on the formula (1), the accuracy of position of type B and U topo-graphic details and other topographic points was estimated, and the accuracy of digital technical map data in object A was estimated together in view of the entire set of 478 control points.
Estimation of the Accuracy of the Object B
Topographic data acquired through the recalculation of the results of direct measurements conducted in the course of 30 years (recorded in technical reports) cannot be regarded as highly uniform due to the variety of the applied topographic survey methods and differences in the applied control networks. For this reason, the accuracy of the object B was estimated by comparing the coordinates of lst group topographic details (type B, G and U) which have been entered into the database of the analyzed map with their model co-ordinates determined in the direct control survey. The error of position of control point was computed based on a simplified formula (2)
(2)
where:
- error of position of a point in the estimated digital map,
AL=^(Xn —Xj )2 +(Yn -Yj)2 - length of vector of shift of control point,
Xn, Yn - co-ordinates of the control point obtained from the database of the estimated map,
X,, Y, - model co-ordinates of the control point,
N - number of control points.
3.2. Determination of the Accuracy of Maps
Produced by Means of Graphical-and-Digital Processing
In case of object C and object D, topographic data were acquired with the use of the graphical-and-digital processing technology. This technology is an advanced process, and in the case of object D it is even morę complex and susceptible to a larger number of sources of potential errors. The problem of estimating the accuracy of each stages of graphical-and-digital processing has been discussed by
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