Experimental evaluation of positional accuracy estimates from a linear network using point- and line-based testing methods

Thomas G. Van Niel · Tim R. McVicar

35 citations0/0 files storedInternational Journal of Geographical Information Systems

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Geographic Information Systems Studies Historical Geography and Cartography 3D Modeling in Geospatial Applications

Abstract

Positional accuracy estimates of linear features based on their well-defined points can be significantly different than the accuracy estimates determined from their adjoining lines. A case study was conducted to determine both the cause of this difference as well as the relative effect of the number of points used in calculating the point-based accuracy estimate. Results showed that: (1) the difference between accuracy estimates was primarily due to dissimilar criteria for measuring closeness of primitive features; and (2) the current US requirement of using 20 well-defined points provided a reasonable estimation of accuracy for the case study. The differences in accuracy estimates described in this study should impact both the definition of geospatial accuracy standards, and the interpretation of geographical analyses with respect to error propagation.

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References

1997A simple positional accuracy measure for linear features 1999An accuracy assessment method for geographical line data sets based on buffering 1998A generic statistical approach for modelling error of geometric features in GIS 1998A locational error model for spatial features 2000Quantifying positional error induced by line simplification

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