Question

What is the main function of control points (tie points) in digitizing?

• A. To assign real-world coordinates to digitized data
• B. To improve image resolution
• C. To add symbols to maps
• D. To reduce file size

Hint:

Remember: \[ \boxed{ \text{Control Points} \rightarrow \text{Georeferencing} \rightarrow \text{Real-world Coordinates} } \]

Answer 1

The Correct Option is A

Concept: Control points (or tie points) are known reference locations used during georeferencing to relate image coordinates to real-world coordinates.

Step 1: Understand control points. They establish correspondence between
• Image coordinates
• Ground (map) coordinates allowing accurate georeferencing.

Step 2: Identify the primary function. Hence, \[ \boxed{\text{Control points assign real-world coordinates to digitized data}.} \] Therefore, the correct option is \[ \boxed{(A).} \]