Errors in GIS data

Spatial vs Attribute Error

Positional error

• Horizontal

• Vertical

• Analyze final product, as errors are nonadditive

• Attack of the Surveyors, much GIS is error prone

• Error Models

  • Point: RMSE

  • Line and Polygon: Epsilon, like error bars

• Errors in acquisition

  • Digitizing

    • Original map error vs Registration Error vs Operator error

  • GPS

  • Photo distortion