Download - Error detection
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”)