![]() ![]() The second source is digital photographs, such as field photographs to be included with CAD files. The drawings could be scanned from a flatbed scanner or a roll scanner, depending on the size and type of drawing. The first is scanned data, which is commonly used when dealing with blueprints or other paper drawings. Raster images in the CAD world typically come from four main sources. A line in raster form, meanwhile, is defined by a series of dots between the start and end point. A line, for example, is defined by two main pieces of data: where it starts and where it ends. One of the benefits of vector drawings is that file sizes can generally be kept smaller. Even basic AutoCAD entities, such as lines and arcs, have data associated with them, such as the beginning and end point coordinates of a line, the radius of an arc, and what layer each entity is on. For example, a contour in Civil 3D would include its contour style, or a fuse in AutoCAD Electrical would include its rating. When you create these objects, they may carry data in addition to the basic entities you see on screen. If you are working with one of the discipline-specific versions of AutoCAD, such as Civil 3D or Electrical, you may actually be working with intelligent objects, such as roadway alignments, contours, lights, or fuses. In other words, when you create an AutoCAD drawing, you are working with specific types of entities: arcs, lines, and text. In the digital world, there are two main types of graphics files: vector drawings and raster images. Vector data typically consists of points that define precise geometric shapes. Raster data differs dramatically from vector data, which is created by software such as AutoCAD in the form of lines, arcs, and other objects. ![]() ![]() This type of data might be obtained from digital photographs, scanned paper drawings, or images created with raster editing software. Industry Problem: How does raster data differ from vector data and how can it be edited?ĬADLearning Expert Solution: Raster data is simply a series of dots or pixels that form an image.
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