Question

Which of the following is not a topological error?

• A. $\text{A gap between polygons}$
• B. $\text{Overlapped polygon}$
• C. $\text{Unclosed polygon}$
• D. $\text{Sliver polygon}$

Hint:

Topological errors include gaps, overlaps, and unclosed polygons, but sliver polygons are small digitization artifacts.

Answer 1

The Correct Option is D

Step 1: Understanding topological errors in GIS. Topological errors occur when spatial relationships between features are incorrect.
Step 2: Explanation of errors. - Gap between polygons a.: Occurs when adjacent polygons do not meet. - Overlapped polygon b.: Two or more polygons occupy the same area. - Unclosed polygon c.: A polygon boundary does not connect properly.
Step 3: Explanation of sliver polygons. - Sliver polygons d. are tiny polygons formed due to digitization errors but do not qualify as a strict topological error.
Step 4: Selecting the correct option. Since sliver polygons are not considered major topological errors, the correct answer is d. Sliver polygon.