error detection
Post on 24-Feb-2016
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DESCRIPTION
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. - PowerPoint PPT Presentation
TRANSCRIPT
Error detection
Types of errors
• Digitizing errors– overshooting– undershooting– polygons do not close– missing data
An example of horrible digitizing!!!
Contour lines never cross!!
“dangling” node
overshooting
River digitizedin the wrong direction
3500m
3900 m
Digitizing rivers in the wrong direction creates “canyon” -like features instead of river valleys
Types of errors
• Location errors (x,y coordinates)• Edge matching (“seamless”)
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