Question

Which of the following is not a common GIS topology error?

• A. Overshoot
• B. Dangles
• C. Buffer
• D. Spikes

Hint:

Common topology errors: \[ \boxed{ \begin{aligned} &\text{Overshoot} &\text{Undershoot (Dangle)} &\text{Spike} &\text{Sliver Polygon} \end{aligned} } \] \[ \boxed{ \text{Buffer} = \text{Spatial Analysis Tool (Not an Error)} } \]

Answer 1

The Correct Option is C

Concept: Topology errors are mistakes in the spatial relationships between GIS features. Common topology errors include overshoots, undershoots (dangles), and spikes. A buffer is not an error—it is a GIS analysis tool.

Step 1: Understand each option.
• Overshoot: Line extends beyond its intended intersection.
• Dangle: Line endpoint remains unconnected.
• Spike: Small unwanted projection created during digitization.
• Buffer: Creates zones at a specified distance around features.

Step 2: Identify the non-error. A buffer is a spatial analysis operation rather than a topology error. Hence, \[ \boxed{\text{Buffer is not a GIS topology error.}} \] Therefore, the correct option is \[ \boxed{(C).} \]