Which statement correctly contrasts raster and vector data models?

Which statement correctly contrasts raster and vector data models?

• A. Raster uses a grid of cells to represent space, while vector uses points and lines to represent features.
• B. Vector uses a grid of cells to represent space, while raster uses points and lines.
• C. Both use the same data structure.
• D. Vector is faster to render than raster in all cases.

Answer: (C)

Spatial data can be stored in two fundamentally different ways. In raster form, space is divided into a regular grid of cells, and each cell holds a value that represents an attribute or category for that area. This makes rasters natural for continuous surfaces like elevation, temperature, or satellite imagery, where the value changes across the landscape and resolution controls the level of detail.

In vector form, features are represented by discrete geometric primitives: points for exact locations, lines for linear features, and polygons for areas. Each primitive has precise coordinates and can carry attributes; topology can be preserved so relationships between features (like which roads intersect or which parcels are enclosed) are known.

The statement that both use the same data structure isn’t accurate because they rely on different representations. The best contrast is that raster uses a grid of cells, while vector uses points and lines (and polygons) to model features. Rendering and analysis characteristics vary accordingly, with rasters often suited to continuous data and simple per-cell operations, and vectors excelling at precise boundaries and topological relationships.