a uniform array or grid of cells defined in row/column sequences with each cell containing a single value. Every location in the data area corresponds to a raster cell.
The representation of spatial data as regular grid cells or tessellations. Cells may be subdivided or aggregated depending on the variety and density of features to be modeled.
Machine-readable data that represents values usually stored for maps or images and organized sequentially by rows and columns. Each "cell" must be rectangular but not necessarily square, as with grid data.
Data expressed as an array of pixels with spatial position implicit in the ordering of the pixels
One method of storing, representing or displaying spatial data in digital form. It consists of using cell data (not necessarily square) arranged in a regular grid pattern in which each unit (pixel or cell) within the grid is assigned an identifying value based on its characteristics (see Vector).
One of the three types of spatial data in a GIS (the others being image and vector data). Raster data represents geographic space as a matrix of cells. Map Features are defined by numeric values assigned to the cells.
Data based on a grid system in which values representing different objects on the ground have been assigned to each cell. Examples include orthophotographs and DRGs.
data that are organized in a grid of columns and rows. Raster data usually represent a planar graph or geographical area. Raster data in ERDAS IMAGINE are stored in .img files.
Data represented by a series of dots or pixels. To the computer, the dots are all disconnected, therefore the ability to extract information from the data is usually limited to the Fourier and associated transforms.
A representation of a spatial data image as a two-dimensional array of numbers that represent pixels or grid-cells. The first row of pixels or grid-cells corresponds to the top row of the image, the second row of pixels to the second row of the image and so forth.