What does the raster data model use to represent locations on the earth?

What does the raster data model use to represent locations on the earth?

• A. A grid of cells (pixels)
• B. Points and lines
• C. Contours
• D. 3D mesh

Answer: (A)

Rasters use a grid of cells (pixels) laid out in rows and columns, with each cell covering a specific ground area and holding a value that represents the attribute at that location. The position of a cell is given by its row and column in the grid, and the overall grid is aligned with a map’s coordinate system, defined by the extent and the resolution (cell size). This regular grid makes raster well-suited for representing continuous surfaces like imagery, elevation, or temperature, where the value changes across space and is sampled at uniform intervals. In contrast, vector representations use points and lines to model discrete features, contours represent elevation lines as separate features, and a 3D mesh is a different modeling approach used for three-dimensional surface surfaces—not the basic way to encode locations in a raster.

Rasters use a grid of cells (pixels) laid out in rows and columns, with each cell covering a specific ground area and holding a value that represents the attribute at that location. The position of a cell is given by its row and column in the grid, and the overall grid is aligned with a map’s coordinate system, defined by the extent and the resolution (cell size). This regular grid makes raster well-suited for representing continuous surfaces like imagery, elevation, or temperature, where the value changes across space and is sampled at uniform intervals. In contrast, vector representations use points and lines to model discrete features, contours represent elevation lines as separate features, and a 3D mesh is a different modeling approach used for three-dimensional surface surfaces—not the basic way to encode locations in a raster.