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Error detection

Error detection. Types of errors. Digitizing errors overshooting undershooting polygons do not close missing data. Contour lines never cross!!. An example of horrible digitizing!!!. overshooting. “dangling” node. River digitized in the wrong direction.

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Error detection

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Presentation Transcript

  1. Error detection

  2. Types of errors • Digitizing errors • overshooting • undershooting • polygons do not close • missing data

  3. Contour lines never cross!! An example of horrible digitizing!!!

  4. overshooting “dangling” node

  5. River digitized in the wrong direction

  6. Digitizing rivers in the wrong direction creates “canyon” -like features instead of river valleys 3900 m 3500m

  7. Types of errors • Location errors (x,y coordinates) • Edge matching (“seamless”)

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