Which of the following statements is true about raster data?

The statement about raster data using a grid of pixels for representation is accurate because raster data is fundamentally composed of a matrix or grid of cells (or pixels), each containing a value that corresponds to information about a specific area. This structure allows raster data to represent various types of information, including continuous data such as temperature, elevation, or satellite imagery, where values vary smoothly over space. Because of this pixel-based representation, raster data is particularly effective for visualizing and analyzing phenomena that occur continuously across a surface.

In terms of the context of the other statements, raster data is not strictly vector-based; instead, vector data consists of discrete geometrical shapes such as points, lines, and polygons. Although raster datasets can be organized or cataloged efficiently, it is not accurate to say they cannot be stored as a catalog. Furthermore, while raster data can be stored in a compressed format to save space, it is not inherently always uncompressed; various compression methods exist to optimize storage and performance.