Question

Which data model represents geographic features using points, lines, and polygons?

• A. Raster model
• B. Vector model
• C. DEM model
• D. TIN model

Hint:

Use Vector data for discrete features with high precision requirements (like cadastral boundaries).
Use Raster data for continuous phenomena (like temperature, precipitation, or digital elevation models).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
In Geographic Information Systems (GIS), real-world features are represented digitally using two primary data models: Raster and Vector.
Step 2: Detailed Explanation:
1. Vector Data Model: This model uses discrete geometric primitives to represent objects with distinct boundaries.
- Points: Represented by a single X, Y coordinate (e.g., a well, a light pole).
- Lines (Polylines): Represented by a sequence of connected points (e.g., a road, a river).
- Polygons: Represented by a closed sequence of connected points forming an area (e.g., a lake, a land parcel).
2. Raster Data Model: This model represents the world as a grid of cells or pixels, where each cell contains a value representing information (e.g., satellite imagery, elevation maps).
Step 3: Final Answer:
The Vector model is the one that uses points, lines, and polygons to represent geographic features.