A series of scan lines which constitute a field or frame of video.

Data displayed as discrete picture elements (pixels).

An abstraction of the real world where spatial data is expressed as a matrix of cells or pixels, with spatial position implicit in the ordering of the pixels. With the raster data model, spatial data is not continuous but divided into discrete units. This makes raster data particularly suitable for certain types of spatial operation.

A raster is a resolution-dependent computer file (usually a scan, but perhaps a file from a paint program). The term is sometimes used synonymously with bitmap, although raster really has a broader meaning. A raster is an electronic file which describes points mathematically on a grid. The finer the grid, the higher the spatial resolution (and the larger the file size). A raster could describe files of varying tonal resolution (i.e., bit depth). Raster files stand in contrast to vector files which use mathematical formulas to describe lines, curves, and tints.

A method of storing image data which consists of cells (pixels) which make up rows and columns. Each cell represents a feature.

Refers to a coverage partitioned into a set of grid cells (usually square) with each cell assigned a value describing some spatially related characteristic (e.g., land use). Usually when the word "raster" is used, the cells are organized by rows.

A raster image is a file that is totally composed of tiny dots, or pixels. It is useful for photos or complex imagery that would be difficult to create as vector art. Some common formats you may be familiar with include: TIFF, GIF & JEPG. Raster files are Resolution Dependent, and will distort if enlarged beyond their intended use and original scale.

A two dimensional array of picture elements (pixels).

A group of closely-spaced lines whose brightness changes so as to appear to be an image.

Also referred to as bitmap images, these are images that are represented by a sequence of pixels (picture elements) or points, which when taken together, describe the display of an image on an output device.

A method of defining an image in terms of dots rather than lines. Raster data typically needs more memory than vector data.

Common GIS data model made up of a grid of cells or pixels. Each pixel contains a single value.

Scanning pattern used in generating, recording or reproducing television, facsimile or graphics images on a screen.

See Raster image

A raster is a rectangular scan pattern of lines that the picture is created upon. It also refers to an active TV monitor that has no video information displayed.

A bitmap image consisting of a matrix of pixels.

describes the image produced by a scanner; it is bit map data, which is a pattern of black and white pixels having no formal relationship to each other, although the human eye may see them together as, for example, a line.

Represents any data source that uses a grid structure to store geographic information. Common examples include remotely sensed data like satellite imagery, scanned data, and photographs.

A predetermined pattern of lines that provides uniform coverage of a display area.

The area that a scanning beam of a CRT illuminates. Also, the array of scan lines that cover a display area and depict images, called a raster scan. (7/96)

The pattern of parallel horizontal scanning lines, traced by a video monitor’s electron beam, making up a video image.

To convert a digital data into pixel maps

Description of a rectangular or square array formed by a number of horizontal scan lines comprising a number of picture elements. The number of scan lines establishes the vertical dimension of the array, and the number of picture elements forms vertical rows that establish the horizontal dimension of the array.

A raster is the pattern of sweeping horizontal parallel lines across a screen such as a television set or computer monitor. On a television set the lines are horizontal and continuous. On a computer monitor the lines consist of dots that are individually illuminated. A cathode-ray-tube (CRT) within the monitor sends an electron beam sweeping across the screen in a pattern from left-to-right, top-to-bottom. The whole sequence takes a small fraction of a second to complete. The area of the visible scan is created is called a raster.

A rectangular pattern of lines; on a video display, the horizontal scan lines from which the term raster scan is derived.

An image file format (eg. jpeg, gif, tif, psd) made up of pixels, whose color and location on a grid determine the image's appearance. These images are resolution dependent: i.e. they show jagged edges when magnified or printed at a higher resolution than what they were created for. Programs like Photoshop, PhotoPaint and PaintShop Pro produce raster images. Also called a Bitmap image.

An image or graphic defined by pixels. A rasterized image can be very detailed, such as a photograph, but lacks the ability to be resized without loss of quality.

A scanning pattern of parallel lines that form the electronic display of an image.

uniform pattern of closely spaced, horizontal lines covering entire screen

A rectangular grid of pointed observations, where at each position the observation is repeated. It is defined by the centre position, the step sizes in Right Ascension and Declination, and by its orientation on the sky.

formation consisting of the set of horizontal lines composed of pixels that is used to form an image on a CRT

a color image specified by a two-dimensional array of colors

a grid of x and y coordinates on a display space

an array of equally spaced cells that when collectively viewed render an image

a rectangular area of pixels from an image or a piece of an image

a rectangular grid of picture elements representing graphical data for display

a rectangular grid of pixel values

a regular grid made up of cells, or in the case of imagery, pixels

A synonym for grid. Sometimes used to refer to the grid of addressable positions in an output device.

Raster images are made up of individual dots; each of which have a defined value that precisely identifies its specific color, size and place within the image. (Also known as bitmapped images.)

A format for storing, processing and displaying graphic data in which graphic images are stored as values for uniform grid cells or pixels.

a predetermined pattern of scanning lines that provides substantially uniform coverage of an area.

Dot-like computer image designed to display on computer screens and be printed in ink. Collections of dots make up raster images, which do not have vector outlines, and therefore cannot be for engraved without vectorizing. A computer scanner creates raster images, as well as most paint-type computer programs. Also called Bitmap images, and in printing are called halftones. See Scanning and Vectorization. Raster is also the name given to the small plastic balls that are inserted into drilled holes on ADA signs to produce raised Braille letters for the blind.

The collection of horizontal lines that make up a video display. E.g. in NTSC there are 525 lines in a frame (two interlaced fields), of which 480 are visible. See: Frame, Interlaced, NTSC.

Grid. A raster display device stores and displays data as horizontal rows of uniform grid or picture cells (pixels). Contrasts with vector.

image is a bit map or grid of x/y coordinates specifying each pixel on a display. It is a large file.

A raster is a rectangular grid of pixels. Essentially an image. Rasters are supported in MapServer with a layer type of RASTER, and a variety of formats are supported including GeoTIFF, JPEG, and PNG.

A displayed bitmap, a raster is essentially a grid of horizontal lines, which make up the picture on the screen.

A series of dots or cells arranged in a regular grid.

A raster is the series of scan lines that make up a TV picture or a computer's display. The term "raster line", is the same as scan line. All of the scan lines that make up a frame of video form a raster. Lines and rows of dots such as those on the illuminated face of a video screen. A matrix of pixels or the scan lines on a CRT.

Set of horizontal lines composed of individual pixels. (German raster = screen)

The scanned (illuminated) area of the cathode-ray picture tube.

the rectangular portion of a display monitor where the actual image appears. The raster is usually smaller than the true dimensions of the display panel. On most modern monitors the raster can be adjusted to allow for maximum image display.

The structure of parallel scan lines covering the usable area of each channel's display.

A rectangular pattern of lines, a grid.

A row of elements, such as pixels on a video monitor. Multiple raster lines comprise the matrix of pixels that form a complete image. Related terms: digitizer (video), grid systems.

A two-dimensional array of black and white cells, called pixels or picture elements, which when displayed on a screen or paper, form an image or representation of an original document.

The teclmique of building up a graphical image as a series of on/off or coloured dots along a set of lines on a screen or other output device. A television set is the commonest form of raster device. In a laser printer or computer display, for example, the image is built up by a signal which is swept along each line in succession, and variously attenuated to produce the required pattern. The alternative method of producing images is 'vector'.

The pattern of parallel horizontal scan lines that makes up a video picture.

a pattern of closely spaced rows of dots that form the image on a cathode-ray tube (as of a television or computer display)

A two-dimensional rectangular grid of pixels.

displays and databases build all geographic features from grid cells in a matrix. A raster display builds an image from pixels, pels, or elements of coarse or fine resolution. A raster database maintains a similar "picture" of reality in which each cell records some sort of information averaged over the cell's area. The size of the cell may again be coarse or fine, ranging from centimeters to kilometers. Many satellites, like Landsat and SPOT, transmit raster images of the earth's surface. Reflectance at a certain wavelength is measured for each cell in an image. The cells may cover areas on the earth's surface several hundreds of meters square, the area covered being a function of a particular satellite's resolution.

The illuminated part of a CRT (TV) display--normally in a 4X3 or 16X9 ratio.

The pattern of motion used in scanning, usually left to right, and repeated over the image from top to bottom as a series of horizontal lines.

an image, or any data, made up of a rectangular array of pixels

one or more overlapping layers for the same grid or digital image.

in most phototypesetters and VDUs the image is 'drawn' with each image being made up of a series of parallel (rasterized) lines that are switched on and of as they cross the image area. The alternative method used on some display terminals is for a vector to draw the outline only of each letter.

In simplest terms, an image composed of discrete pixels. All bitmap images are by their nature raster graphics. A raster image degrades when scaled larger, as opposed to a vector graphic.

Graphic Artwork that is made up of pixels where each pixel is assigned a color value. Digital photos are raster graphics. Common raster file extensions include .JPG, .GIF, .TIF, and .BMP. While aster artwork can be shrunk without losing quality, they cannot be enlarged. See also: Vector Graphic

Graphics composed of pixels on a bitmap, allowing for solid colored objects and graphics as we see them.

The track of the beam in a SEM or S/TEM as it produces an image. Rastering moves the beam from left-to-right and top-to-bottom as it progresses line-by-line until the image is complete.

A data structure composed of a grid of cells. Groups of cells represent geographical features; the value in the cell represents the attribute of the feature.

Raster images are made of an array of either 2-D or 3-D information. Image data is usually stored in a bitmapped form and sometimes these files are called bitmapped files. Examples of raster image files are TIFF, GIF and JPEG.

a horizontal scan line on a screen. TV and computer screens work by painting a series of raster lines that change rapidly to convey the sense of moving pictures or text.

A frame or pattern that an electron beam sends to the screen on your monitor. Scan patterns are sent to the screen continuously, a line at a time, to create the images and motion you see. The patterns displayed on the screen are sent using an electron "gun" that wipes the inside of your monitor like a firefighter's hose. The patters are sent from top to bottom and each new pattern is sent before the last one is finished. This creates "bands" of images called raster images.

The scanning pattern for television display; a series of horizontal lines, usually left to right, top to bottom. In NTSC and PAL systems, the first and last lines are half lines.

the scanned area comprising the active portion of a video signal displayed on a cathode ray tube (CRT).

On a monitor or television screen, the horizontal pattern of lines that forms the image. Raastarii View

Raster images are made up of a regular grid of cells covering an area. Each cell must be rectangular in shape, although not necessarily square. Each cell within this matrix contains an attribute value as well as location co-ordinates. The spatial location of each cell is implicitly contained within the ordering of the matrix, unlike a vector structure which stores topology explicitly. Areas containing the same attribute value are recognised as such, however, raster structures cannot identify the boundaries of such areas as polygons. Also raster structures may lead to increased storage in certain situations, since they store each cell in the matrix regardless of whether it is a feature or simply 'empty' space. Televisions, computer monitors and digital orthophotos are raster images.

A geometric pattern followed by the sending element of a detector system or by the electron beam of a television transmitter or receiver.

The area of a image tube that Is scanned by the electron beam.

A term for the horizontal lines of pixels on a TV or CRT screen, refreshed at a rate of 30 times a second to display an image on the screen.

The process of rendering an image or a page using the technology that helped create the television. It involves rendering the particular image or page, pixel by pixel, in a sweeping vertical or horizontal motion, like a rake drawing lines in the dirt.

The rectangular pattern of scanning lines upon which the picture is produced. The illuminated face of the TV monitor without the video information present.

A pattern of scanning for input or output, which provides uniform coverage of a two-dimensional surface, such as a monitor screen, a scanner bed, or the CCD array in a digital camera.

A way of displaying spatial information as coloured grid cells. Also referred to as bitmap as effectively a map of bits is evident.

Monitor signal generation defined by scanning the whole screen in, line by line, from top to bottom. This is the most common method, as opposed to vector signal generation.

The scanned (illuminated) area of a television picture tube.

an image consisting of individual pixels to create a larger picture

A raster image is a matrix of row and column data points whose values represent energy being reflected or emitted from the object being viewed. These values, or pixels, can be viewed on a display monitor as a black and white or color image.

A regular grid or array of cells covering a spatial area. A raster is often viewed as consisting of rows and columns of grid cells.

The random pattern of illumination seen on a television screen when no video signal is present.

The collection of horizontal scan lines that makes up a picture on a display. A reference to it normally assumes that the sync elements of the signal are included.

Images made of dots. Each individual one contains specific information as to its size, color and position within the image.

the set of parallel horizontal scans reproduced many times per second to form an image.

A method of representing an image with a grid (or “map”) of dots or pixels. Typical raster file formats are GIF, JPEG, TIFF, PCX, BMP, etc.

the vertical spacing of television scanning lines. Used also as slang for channel spacing

pattern of horizontal, parallel scan lines comprising the image on a cathode ray tube screen, on which each scan line consists of segments varying in intensity.

Raster data takes an evenly spaced grid (like a piece of graph paper) and places a value in each square, or cell. Raster data is best suited for continuous data such as slope, rainfall, or the amount of light reflecting off the ground (as in a photograph). Aerial photographs and satellite images are examples of raster images used in mapping.

The area of the video display that is covered by sweeping the electron beam of the display horizontally and vertically. Normally the electronics of the display sweep each line horizontally from top to bottom and return to the top during the vertical retrace interval. See also frame buffer.

The process of rendering an image or page, pixel by pixel, in a sweeping horizontal motion, one line after another.

A cellular data structure composed of rows and columns for storing images. Groups of cells with the same value represent features. See also grid.