What is the difference between raster data and vector data?

• A. Raster data is more precise than vector data
• B. Raster data represents continuous phenomena and is pixel-based; vector data represents discrete features
• C. Vector data is used for 3D modeling while raster data is not
• D. Raster data can only show vegetation features

Answer: (B)

Raster data and vector data are two fundamental types of data used in Geographic Information Systems (GIS), each serving distinct purposes based on their structure and representation of spatial information.

Raster data is composed of a grid of pixels, where each pixel represents a specific value or attribute, suitable for representing continuous phenomena such as elevation, temperature, or land cover. This pixel-based structure allows raster data to capture gradual variations across a landscape, making it ideal for applications like satellite imagery and surface models.

On the other hand, vector data is characterized by points, lines, and polygons, which represent discrete features such as roads, buildings, and boundaries. Each vector feature is defined by coordinates and can include additional attributes. This represents real-world objects and entities more precisely, as it captures their geometric shapes and relationships better than raster.

The correct option highlights this key distinction: raster data is particularly adept at illustrating continuous data trends, while vector data excels at delineating specific, identifiable features. These inherent differences in representation shape the choice of data type based on the analysis needs within a GIS context.