Data stored in a raster format represents real-world phenomena: Thematic data (also known as discrete) represents features such as land-use or soils data. Rasters are digital aerial photographs, imagery from satellites, digital pictures, or even scanned maps. The final plot file (or data spooled through Windows) consists of only non-overlapping raster tiles. When printing in rasterized mode, all the graphics in the design are converted into raster by the MicroStation display system before being sent to the printer driver. A memory area called refresh buffer or frame buffer stores picture definition. In raster scan system electron beam sweeps across the screen, from top to bottom covering one row at a time. A pattern of illuminated pattern of spots is created by turning beam intensity on and off as it moves across each row. How are pictures created in raster scan system? This decision also involves determining whether to store all the data in a single dataset or in a catalog of potentially many datasets. There are three methods to store image and raster data: as files in a file system, within a geodatabase, or managed from within the geodatabase but stored in a file system. Raster graphics, also called bitmap graphics, a type of digital image that uses tiny rectangular pixels, or picture elements, arranged in a grid formation to represent an image. Since raster images are pixel based, they are resolution dependent. Raster images are compiled using pixels, or tiny dots, containing unique color and tonal information that come together to create the image. These are the types of images that are produced when scanning or photographing an object. What are the characteristics of raster images? Some advantages of raster graphics include the following: they are easy to use they provide subtle gradations of color and they are simple to edit using common programs like Photoshop and Microsoft Paint. What are the advantages of raster graphics? Raster graphics, such as digital photographs, are created using a grid of tiny pixels. Vector graphics, such as logo files, use intricate paths made up of points and lines to create an image. Each pixel (picture element) has one or more numbers associated with it, specifying a color which the pixel should be displayed in.ĭigital graphic files will generally fall into one of two categories-vector or raster. These images are created by digital cameras, by scanning images into a computer or with raster-based software.Ī raster image file is a rectangular array of regularly sampled values, known as pixels. Pixels appear like little squares on graph paper when the image is zoomed in or enlarged. Raster images are made of pixels, or tiny dots that use color and tone to produce the image. Show and analyze geo images in Civil 3D civil engineering software and the AutoCAD Map 3D toolset. Figure 10: Use Raster Design to convert scanned topography into polylines with elevation.Ĭreate lines and polylines from raster images, and convert raster files into vector drawings. Since Raster Design integrates completely with Civil 3D, when converting from a scanned map, you can generate contour lines as polylines with true elevations. Specialized tools that give the same results as basic AutoCAD with quicker, more efficient workflows. The Raster Design palette provides comprehensive image data including image properties, image colors, and image file location.
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