Question

Which of the following functions can remove the unnecessary features from a data layer ?

• A. Query
• B. Overlay
• C. Dissolve
• D. Edge matching

Hint:

A "Query" is simply asking the database a question. The database answers by keeping what you asked for and removing the rest.

Answer 1

The Correct Option is A

Step 1: Concept
GIS software provides various tools to manipulate, combine, or extract data from geographic layers based on specific criteria.

Step 2: Meaning
To "remove unnecessary features" means filtering a dataset so that only the data meeting specific conditions remains visible or active.

Step 3: Analysis

• Overlay combines two or more layers to create a new layer showing spatial intersections.
• Dissolve merges adjacent polygons that share the same attributes, simplifying the map.
• Edge matching aligns features across the borders of adjacent map sheets.
• Query operations (either spatial or attribute queries) allow a user to select specific features that match defined criteria, effectively filtering out and hiding/removing the unnecessary features from the active analysis layer.

Step 4: Conclusion
Querying is the standard operation for isolating desired features and eliminating unnecessary ones from a dataset. Final Answer: (A)