[GD6-1] Geometric accuracy

Geometric accuracy is a measure indicating how close the geometric values of the data are to the real world position of the mapped feature.

External resources

• Möller, M., Birger, J., Gidudu, A., & Gläßer, C. (2013). A framework for the geometric accuracy assessment of classified objects. International Journal of Remote Sensing, 34(24), 8685-8698.

Learning outcomes

• 799 - In contrast to the National Map Accuracy Standard, explain how the spatial accuracy of a digital road centerlines data set may be evaluated and documented
  In contrast to the National Map Accuracy Standard, explain how the spatial accuracy of a digital road centerlines data set may be evaluated and documented
• 800 - Explain the formula for calculating root mean square error
  Explain the formula for calculating root mean square error
• 801 - Compare the concepts of geometric accuracy and topological fidelity
  Compare the concepts of geometric accuracy and topological fidelity
• 802 - Describe how geometric accuracy should be documented in terms of the FGDC metadata standard
  Describe how geometric accuracy should be documented in terms of the FGDC metadata standard
• 803 - State the geometric accuracies associated with the various orders of the U.S. horizontal geodetic control network
  State the geometric accuracies associated with the various orders of the U.S. horizontal geodetic control network
• 804 - Explain how geometric accuracies associated with the various orders of the U.S. horizontal geodetic control network are assured
  Explain how geometric accuracies associated with the various orders of the U.S. horizontal geodetic control network are assured
• 805 - State the approximate number and spacing of control points in each order of the horizontal geodetic control network
  State the approximate number and spacing of control points in each order of the horizontal geodetic control network
• 806 - Explain the factors that influence the geometric accuracy of data produced with Global Positioning System (GPS) receivers
  Explain the factors that influence the geometric accuracy of data produced with Global Positioning System (GPS) receivers
• 807 - Explain the concept of dilution of precision
  Explain the concept of dilution of precision
• 808 - Describe the impact of the concept of dilution of precision on the uncertainty of GPS positioning
  Describe the impact of the concept of dilution of precision on the uncertainty of GPS positioning
• 809 - Explain the principle of differential correction in relation to the global positioning system
  Explain the principle of differential correction in relation to the global positioning system
• 810 - Apply the National Map Accuracy Standard to calculate the accuracy associated with the various USGS topographic map scales
  Apply the National Map Accuracy Standard to calculate the accuracy associated with the various USGS topographic map scales
• 811 - Compare the National Map Accuracy Standard with the ASPRS Coordinate Standard
  Compare the National Map Accuracy Standard with the ASPRS Coordinate Standard

Self assessment

Outgoing relations

• [GD6-1] Geometric accuracy subclassof [GD4-1] Data quality