GEOG 892
Geospatial Applications of Unmanned Aerial Systems (UAS)

Positional Errors and Accuracy

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Positional Errors and Accuracy

According to the ASPRS Positional Accuracy Standards for Digital Geospatial Data, the terms positional error and absolute and relative accuracy are defined as follow:

  • Positional error – The difference between data set coordinate values and coordinate values from an independent source of higher accuracy for identical points.
  • Positional accuracy – The accuracy of the position of features, including horizontal and vertical positions, with respect to horizontal and vertical datum.
  • Relative accuracy – A measure of variation in point-to-point accuracy in a data set.
  • Relative accuracy – Characterizes the internal geometric quality of an elevation data set without regard to surveyed ground control.